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We encourage you to perform a real-time search of NLEBeta
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1

Increasing the active surface of titanium islands on graphene by nitrogen sputtering  

E-Print Network [OSTI]

Titanium-island formation on graphene as a function of defect density is investigated. When depositing titanium on pristine graphene, titanium atoms cluster and form islands with an average diameter of about 10nm and an average height of a few atomic layers. We show that if defects are introduced in the graphene by ion bombardment, the mobility of the deposited titanium atoms is reduced and the average diameter of the islands decreases to 5nm with monoatomic height. This results in an optimized coverage for hydrogen storage applications since the actual titanium surface available per unit graphene area is significantly increased.

Mashoff, T; Miseikis, V; Coletti, C; Piazza, V; Beltram, F; Heun, S

2014-01-01T23:59:59.000Z

2

Exploring the structure and chemical activity of 2-D gold islands on graphene moire/Ru(0001)  

E-Print Network [OSTI]

Exploring the structure and chemical activity of 2-D gold islands on graphene moire/Ru(0001) Ye Xu May 2011 DOI: 10.1039/c1fd00030f Au deposited on Ru(0001)-supported extended, continuous graphene. These Au islands conform to the corrugation of the underlying graphene and display commensurate moire

Goodman, Wayne

3

Cooperative Island Growth of Large Area Single-Crystal Graphene by Chemical Vapor Deposition on Cu  

SciTech Connect (OSTI)

We describe a two-step approach for suppressing nucleation of graphene on Cu using chemical vapor deposition. In the first step, as received Cu foils are oxidized in air at temperatures up to 500 C to remove surface impurities and to induce the regrowth of Cu grains during subsequent annealing in H2 flow at 1040 C prior to graphene growth. In the second step, transient reactant cooling is performed by using a brief Ar pulse at the onset of growth to induce collisional deactivation of the carbon growth species. The combination of these two steps results in a three orders of magnitude reduction in the graphene nucleation density, enabling the growth of millimeter-size single crystal graphene grains. A kinetic model shows that suppressing nucleation promotes a cooperative island growth mode that favors the formation of large area single crystal graphene, and it is accompanied by a roughly 3 orders of magnitude increase in the reactive sticking probability of methane compared to that in random nucleation growth.

Regmi, Murari [Oak Ridge National Laboratory (ORNL); Rouleau, Christopher [Oak Ridge National Laboratory (ORNL); Puretzky, Alexander A [ORNL; Ivanov, Ilia N [ORNL; Geohegan, David B [ORNL; Chen, Jihua [ORNL; Eastman, Jeffrey [Argonne National Laboratory (ANL); Eres, Gyula [ORNL

2014-01-01T23:59:59.000Z

4

NAME: Old Place Creek Berm Removal Project LOCATION: Staten Island, Richmond County, New York  

E-Print Network [OSTI]

, particularly pesticides, and their removal from the system is an additional benefit of the project. In additionNAME: Old Place Creek Berm Removal Project LOCATION: Staten Island, Richmond County, New York ACRES Island, New York. Restoration will be accomplished through removal of an earthen berm, restoring

US Army Corps of Engineers

5

NAME: Molokai Fish Pond & Fringing Reef Restoration LOCATION: Kaunakakai, Island of Molokai (Maui County), Hawai'i  

E-Print Network [OSTI]

NAME: Molokai Fish Pond & Fringing Reef Restoration LOCATION: Kaunakakai, Island of Molokai (Maui fish ponds on the fringing reef of the Hawaiian island of Molokai. Mangroves were planted in 1902 conditions and threaten to take over the reef flats and fish ponds. EXPECTED BENEFITS: Fine sediment flushed

US Army Corps of Engineers

6

Taphonomic Trends Along a Forereef Slope: Lee Stocking Island, Bahamas. I. Location and Water Depth  

Science Journals Connector (OSTI)

...contribution focuses on the influence of EOD and water depth. The dimension of time...locations were selected to be representative of EOD depth ranges. The location and transect...the influence of dissolution was much more EOD specific. Dissolution was highest in Codakia...

W. RUSSELL CALLENDER; GEORGE M. STAFF; KARLA M. PARSONS-HUBBARD; ERIC N. POWELL; GILBERT T. ROWE; SALLY E. WALKER; CARLTON E. BRETT; ANNE RAYMOND; DONNA D. CARLSON; SUZANNE WHITE; ELIZABETH A. HEISE

7

Graphene nanoribbon based spaser  

Science Journals Connector (OSTI)

A novel type of spaser with the net amplification of surface plasmons (SPs) in a doped graphene nanoribbon is proposed. The plasmons in the THz region can be generated in a doped graphene nanoribbon due to nonradiative excitation by emitters like two level quantum dots located along a graphene nanoribbon. The minimal population inversion per unit area, needed for the net amplification of SPs in a doped graphene nanoribbon, is obtained. The dependence of the minimal population inversion on the surface plasmon wave vector, graphene nanoribbon width, doping, and damping parameters necessary for the amplification of surface plasmons in the armchair graphene nanoribbon is studied.

Oleg L. Berman; Roman Ya. Kezerashvili; Yurii E. Lozovik

2013-12-19T23:59:59.000Z

8

Graphene and Graphene Oxide: Biofunctionalization and Applications...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and Graphene Oxide: Biofunctionalization and Applications in Biotechnology. Graphene and Graphene Oxide: Biofunctionalization and Applications in Biotechnology. Abstract: Graphene...

9

12 - Single-charge transport in graphene  

Science Journals Connector (OSTI)

Abstract: The single-charge tunneling behavior in graphene devices is reviewed and the Coulomb blockade phenomena observed in graphene constrictions, patterned single-electron transistors and graphene nanoribbons are compared with those observed in the conventional single-electron transistors with metallic islands. The phenomena that occur when compressible quantum dots are formed in graphene in the quantum Hall regime, including mesoscopic conductance fluctuations resulting from single-charge tunneling into/out of the quantum dots, are discussed.

D.S. Lee

2014-01-01T23:59:59.000Z

10

Graphene Transistors Fabricated via Transfer-Printing In Device Active-Areas  

E-Print Network [OSTI]

Graphene Transistors Fabricated via Transfer-Printing In Device Active-Areas on Large Wafer Xiaogan graphene islands from a graphite and then uses transfer printing to place the islands from the stamp from the printed graphene. The transistors show a hole and electron mobility of 3735 and 795 cm2/V

11

Tailoring Li adsorption on graphene  

Science Journals Connector (OSTI)

The technological potential of functionalized graphene has recently stimulated considerable interest in the study of the adsorption of metal atoms on graphene. However, a complete understanding of the optimal adsorption pattern of metal atoms on a graphene substrate has not been easy because of atomic relaxations at the interface and the interaction between metal atoms. We present a partial particle swarm optimization technique that allows us to efficiently search for the equilibrium geometries of metal atoms adsorbed on a substrate as a function of adatom concentration. Using Li deposition on graphene as an example we show that, contrary to previous works, Li atoms prefer to cluster, forming four-atom islands, irrespective of their concentration. We further show that an external electric field applied vertically to the graphene surface or doping with boron can prevent this clustering, leading to the homogeneous growth of Li.

Jian Zhou; Qiang Sun; Qian Wang; Puru Jena

2014-11-20T23:59:59.000Z

12

Epitaxial graphene on Cu(111).  

SciTech Connect (OSTI)

The growth of graphene on single crystal Cu(111) has been achieved by thermal decomposition of ethylene in an ultrahigh vacuum chamber for the first time. The structural and electronic properties of graphene on Cu(111) have been investigated by scanning tunneling microscopy and spectroscopy. The nucleation of monolayer islands and two predominant domain orientations have been observed, which lead to the formation of numerous domain boundaries with increasing coverage. These results reveal that reducing the density of domain boundaries is one challenge of growing high-quality graphene on copper.

Gao, L.; Guest, J. R.; Guisinger, N. P. (Center for Nanoscale Materials)

2010-09-01T23:59:59.000Z

13

Deposition of thin silicon layers on transferred large area graphene  

SciTech Connect (OSTI)

Physical vapor deposition of Si onto transferred graphene is investigated. At elevated temperatures, Si nucleates preferably on wrinkles and multilayer graphene islands. In some cases, however, Si can be quasi-selectively grown only on the monolayer graphene regions while the multilayer islands remain uncovered. Experimental insights and ab initio calculations show that variations in the removal efficiency of carbon residuals after the transfer process can be responsible for this behavior. Low-temperature Si seed layer results in improved wetting and enables homogeneous growth. This is an important step towards realization of electronic devices in which graphene is embedded between two Si layers.

Lupina, Grzegorz, E-mail: lupina@ihp-microelectronics.com; Kitzmann, Julia; Lukosius, Mindaugas; Dabrowski, Jarek; Wolff, Andre; Mehr, Wolfgang [IHP, Im Technologiepark 25, 15236 Frankfurt (Oder) (Germany)] [IHP, Im Technologiepark 25, 15236 Frankfurt (Oder) (Germany)

2013-12-23T23:59:59.000Z

14

Arctic ice islands  

SciTech Connect (OSTI)

The development of offshore oil and gas resources in the Arctic waters of Alaska requires offshore structures which successfully resist the lateral forces due to moving, drifting ice. Ice islands are floating, a tabular icebergs, up to 60 meters thick, of solid ice throughout their thickness. The ice islands are thus regarded as the strongest ice features in the Arctic; fixed offshore structures which can directly withstand the impact of ice islands are possible but in some locations may be so expensive as to make oilfield development uneconomic. The resolution of the ice island problem requires two research steps: (1) calculation of the probability of interaction between an ice island and an offshore structure in a given region; and (2) if the probability if sufficiently large, then the study of possible interactions between ice island and structure, to discover mitigative measures to deal with the moving ice island. The ice island research conducted during the 1983-1988 interval, which is summarized in this report, was concerned with the first step. Monte Carlo simulations of ice island generation and movement suggest that ice island lifetimes range from 0 to 70 years, and that 85% of the lifetimes are less then 35 years. The simulation shows a mean value of 18 ice islands present at any time in the Arctic Ocean, with a 90% probability of less than 30 ice islands. At this time, approximately 34 ice islands are known, from observations, to exist in the Arctic Ocean, not including the 10-meter thick class of ice islands. Return interval plots from the simulation show that coastal zones of the Beaufort and Chukchi Seas, already leased for oil development, have ice island recurrences of 10 to 100 years. This implies that the ice island hazard must be considered thoroughly, and appropriate safety measures adopted, when offshore oil production plans are formulated for the Alaskan Arctic offshore. 132 refs., 161 figs., 17 tabs.

Sackinger, W.M.; Jeffries, M.O.; Lu, M.C.; Li, F.C.

1988-01-01T23:59:59.000Z

15

Graphene Energy | Open Energy Information  

Open Energy Info (EERE)

Graphene Energy Graphene Energy Jump to: navigation, search Name Graphene Energy Place Austin, Texas Sector Carbon Product Graphene develops nano-technology based ultracapacitors for energy storage using a unique form of carbon, called graphene, for electrode material. Coordinates 30.267605°, -97.742984° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":30.267605,"lon":-97.742984,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

16

Magnetism in Graphene Nanoislands  

Science Journals Connector (OSTI)

We study the magnetic properties of nanometer-sized graphene structures with triangular and hexagonal shapes terminated by zigzag edges. We discuss how the shape of the island, the imbalance in the number of atoms belonging to the two graphene sublattices, the existence of zero-energy states, and the total and local magnetic moment are intimately related. We consider electronic interactions both in a mean-field approximation of the one-orbital Hubbard model and with density functional calculations. Both descriptions yield values for the ground state total spin S consistent with Liebs theorem for bipartite lattices. Triangles have a finite S for all sizes whereas hexagons have S=0 and develop local moments above a critical size of ?1.5??nm.

J. Fernndez-Rossier and J. J. Palacios

2007-10-23T23:59:59.000Z

17

Diluted Graphene Antiferromagnet  

Science Journals Connector (OSTI)

We study RKKY interactions between local magnetic moments for both doped and undoped graphene. In the former case interactions for moments located on definite sublattices fall off as 1/R2, whereas for those placed at interstitial sites they decay as 1/R3. The interactions are primarily (anti)ferromagnetic for moments on (opposite) equivalent sublattices, suggesting that at low temperature dilute magnetic moments embedded in graphene can order into a state analogous to that of a dilute antiferromagnet. In the undoped case we find no net magnetic moment in the ground state, and demonstrate numerically this effect for ribbons, suggesting the possibility of an unusual spin-transfer device.

L. Brey; H. A. Fertig; S. Das Sarma

2007-09-12T23:59:59.000Z

18

Noncommutative Graphene  

E-Print Network [OSTI]

We consider a noncommutative description of graphene. This description consists of a Dirac equation for massless Dirac fermions plus noncommutative corrections, which are treated in the presence of an external magnetic field. We argue that, being a two-dimensional Dirac system, graphene is particularly interesting to test noncommutativity. We find that momentum noncommutativity affects the energy levels of graphene, but that it does not entail any kind of correction to the Hall conductivity.

C. Bastos; O. Bertolami; N. Dias; J. Prata

2012-07-24T23:59:59.000Z

19

Functionalization of Graphene and Graphene Oxide for Biosensing and Imaging  

SciTech Connect (OSTI)

Recent advances in our group about graphene biofunctionalization are discussed. In particular, the functionalization of graphene and graphene oxide, biosensing and bioimaging by using graphene-based nanomaterials, and some fundamental studies of graphene and graphene oxide have been summarized.

Li, Zhaohui; Wang, Ying; Du, Dan; Tang, Zhiwen; Wang, Jun; Lin, Yuehe

2011-08-15T23:59:59.000Z

20

Newby Island I Biomass Facility | Open Energy Information  

Open Energy Info (EERE)

Island I Biomass Facility Facility Newby Island I Sector Biomass Facility Type Landfill Gas Location Santa Clara County, California Coordinates 37.2938907, -121.7195459...

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Newby Island II Biomass Facility | Open Energy Information  

Open Energy Info (EERE)

Island II Biomass Facility Facility Newby Island II Sector Biomass Facility Type Landfill Gas Location Santa Clara County, California Coordinates 37.2938907, -121.7195459...

22

Raman Nanometrology of Graphene  

E-Print Network [OSTI]

13 Optical image of the graphene layers. . . . . .Micro-Raman Spectroscopy of Grapheneand Graphene Multi-Layers . . . . Raman Spectroscopy

Calizo, Irene Gonzales

2009-01-01T23:59:59.000Z

23

Characterization of few-layered graphene grown by carbon implantation  

SciTech Connect (OSTI)

Graphene is considered to be a very promising material for applications in nanotechnology. The properties of graphene are strongly dependent on defects that occur during growth and processing. These defects can be either detrimental or beneficial to device performance depending on defect type, location and device application. Here we present experimental results on formation of few-layered graphene by carbon ion implantation into nickel films and characteristics of graphene devices formed by graphene transfer and lithographic patterning. Micro-Raman spectroscopy was used to determine the number of graphene layers formed and identify defects arising from the device processing. The graphene films were cleaned by annealing in vacuum. Transport properties of cleaned graphene films were investigated by fabrication of back-gated field-effect transistors, which exhibited high hole and electron mobility of 1935 and 1905 cm2/Vs, respectively.

Lee, Kin Kiong; McCallum, Jeffrey C.; Jamieson, David N. [Centre for Quantum Computation and Communication Technology, School of Physics, The University of Melbourne, Parkville, Victoria 3010 (Australia)

2014-02-21T23:59:59.000Z

24

Integrating Graphene with Ferroelectrics | Argonne National Laboratory  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Integrating Graphene with Ferroelectrics November 12, 2014 11:00AM to 12:00PM Presenter Xia Hong, University of Nebraska-Lincoln Location Building 440, Room A105-106 Type Seminar...

25

Negative compressibility observed in graphene containing resonant impurities  

SciTech Connect (OSTI)

We observed negative compressibility in monolayer graphene containing resonant impurities under different magnetic fields. Hydrogenous impurities were introduced into graphene by electron beam (e-beam) irradiation. Resonant states located in the energy region of {+-}0.04 eV around the charge neutrality point were probed in e-beam-irradiated graphene capacitors. Theoretical results based on tight-binding and Lifshitz models agreed well with experimental observations of graphene containing a low concentration of resonant impurities. The interaction between resonant states and Landau levels was detected by varying the applied magnetic field. The interaction mechanisms and enhancement of the negative compressibility in disordered graphene are discussed.

Chen, X. L.; Wang, L.; Li, W.; Wang, Y.; He, Y. H.; Wu, Z. F.; Han, Y.; Zhang, M. W.; Xiong, W.; Wang, N. [Department of Physics and The William Mong Institute of Nano Science and Technology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong (China)] [Department of Physics and The William Mong Institute of Nano Science and Technology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong (China)

2013-05-20T23:59:59.000Z

26

Introduction Transport in disordered graphene  

E-Print Network [OSTI]

Introduction Transport in disordered graphene Summary Ballistic transport in disordered graphene P, Gornyi, Mirlin Ballistic transport in disordered graphene #12;Introduction Transport in disordered graphene Summary Outline 1 Introduction Model Experimental motivation Transport in clean graphene 2

Fominov, Yakov

27

Alternative Fuels Data Center: Rhode Island Information  

Alternative Fuels and Advanced Vehicles Data Center [Office of Energy Efficiency and Renewable Energy (EERE)]

Rhode Island Rhode Island Information to someone by E-mail Share Alternative Fuels Data Center: Rhode Island Information on Facebook Tweet about Alternative Fuels Data Center: Rhode Island Information on Twitter Bookmark Alternative Fuels Data Center: Rhode Island Information on Google Bookmark Alternative Fuels Data Center: Rhode Island Information on Delicious Rank Alternative Fuels Data Center: Rhode Island Information on Digg Find More places to share Alternative Fuels Data Center: Rhode Island Information on AddThis.com... Rhode Island Information This state page compiles information related to alternative fuels and advanced vehicles in Rhode Island and includes new incentives and laws, alternative fueling station locations, truck stop electrification sites, fuel prices, and local points of contact.

28

Superhydrophobic Functionalized Graphene Aerogels  

Science Journals Connector (OSTI)

Superhydrophobic Functionalized Graphene Aerogels ... This paper demonstrates that graphene aerogels with a silane surface modification can provide superhydrophobicity. ... Graphene aerogels of various concentrations were synthesized and the receding contact angle of a water droplet was measured. ...

Yirong Lin; Gregory J. Ehlert; Colton Bukowsky; Henry A. Sodano

2011-06-29T23:59:59.000Z

29

Hydrogen storage with titanium-functionalized graphene  

E-Print Network [OSTI]

We report on hydrogen adsorption and desorption on titanium-covered graphene in order to test theoretical proposals to use of graphene functionalized with metal atoms for hydrogen storage. At room temperature titanium islands grow with an average diameter of about 10 nm. Samples were then loaded with hydrogen, and its desorption kinetics was studied by thermal desorption spectroscopy. We observe the desorption of hydrogen in the temperature range between 400K and 700 K. Our results demonstrate the stability of hydrogen binding at room temperature and show that hydrogen desorbs at moderate temperatures in line with what required for practical hydrogen-storage applications.

Mashoff, Torge; Tanabe, Shinichi; Hibino, Hiroki; Beltram, Fabio; Heun, Stefan

2013-01-01T23:59:59.000Z

30

Controlling Graphene's Electronic Structure  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Controlling Graphene's Electronic Structure Print Graphene, because of its unusual electron properties, reduced dimensionality, and scale, has enormous potential for use in...

31

Controlling Graphene's Electronic Structure  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Controlling Graphene's Electronic Structure Print Wednesday, 25 April 2007 00:00 Graphene, because of its unusual electron properties, reduced dimensionality, and scale, has...

32

Linear Graphene Plasmons  

Science Journals Connector (OSTI)

The coupling of the plasmon spectra of graphene and a nearby thick plasma is examined here in detail. The coupled modes include linear plasmons. Keywords: Graphene, plasmons, surface

N. J.M. Horing

2010-11-01T23:59:59.000Z

33

Electronic Transport in Graphene  

Science Journals Connector (OSTI)

This chapter provides an experimental overview of the electrical transport properties of graphene and graphene nanoribbons, focusing on phenomena related to electronics ... and compares the characteristics of exf...

Jun Zhu

2012-01-01T23:59:59.000Z

34

Long Island Solar Farm Project Overview  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Island Solar Farm Island Solar Farm Project Overview The Long Island Solar Farm (LISF) is a 32-megawatt solar photovoltaic power plant built through a collaboration including BP Solar, the Long Island Power Authority (LIPA), and the Department of Energy. The LISF, located on the Brookhaven National Laboratory site, began delivering power to the LIPA grid in November 2011, and is currently the largest solar photovoltaic power plant in the Eastern United States. It is generating enough renewable

35

Christmas Island  

Science Journals Connector (OSTI)

... HAVING read with much interest the description of Christmas Island by Captain Aldrich and Mr. Lister, I have endeavoured to interpret some of ... . Lister, I have endeavoured to interpret some of the facts there given in the light of my own examination of similar islands in the Western Pacific. As pointed out ...

H. B. GUPPY

1888-01-05T23:59:59.000Z

36

Effects of nonmagnetic impurities on the spin transport property of a graphene nanoribbon device  

E-Print Network [OSTI]

Effects of nonmagnetic impurities on the spin transport property of a graphene nanoribbon device to an edge of a graphene nanoribbon device GND with zigzag edges. A center-located impurity enables both American Institute of Physics. DOI: 10.1063/1.3138776 I. INTRODUCTION Electronic spin transport in graphene

Lee, EokKyun

37

Numerical investigation of graphene and graphene-polymer nanocomposites.  

E-Print Network [OSTI]

??This thesis is a comprehensive and deep investigation on graphene and graphene-polymer nanocomposites. It explores the strong structure-property relationships in both graphene and graphene-based polymeric (more)

Wang, Mingchao

2014-01-01T23:59:59.000Z

38

Echoes of relativistic Landau levels in graphene and bilayer graphene  

Science Journals Connector (OSTI)

The problem of echo effects that can originate in graphene and bilayer graphene upon the generation of relativistic Landau levels in a quantizing magnetic field is considered. Graphene (bilayer graphene) is consi...

M. B. Belonenko; N. G. Lebedev; A. V. Zhukov

2012-03-01T23:59:59.000Z

39

Determining graphene adhesion via substrate-regulated morphology of graphene  

E-Print Network [OSTI]

Determining graphene adhesion via substrate-regulated morphology of graphene Zhao Zhang and Teng Li Institute of Physics. Related Articles Identification of graphene crystallographic orientation by atomic two-dimensional, epitaxially-grown, nanostructured graphene for study of single molecule

Li, Teng

40

Photochemical Chlorination of Graphene  

Science Journals Connector (OSTI)

Photochemical Chlorination of Graphene ... We report the covalent functionalization of graphene by photochemical chlorination. ... The gas-phase photochlorination of graphene, followed by the structural transformation of the CC bonds from sp2 to sp3 configuration, could remove the conducting ?-bands and open up a band gap in graphene. ...

Bo Li; Lin Zhou; Di Wu; Hailin Peng; Kai Yan; Yu Zhou; Zhongfan Liu

2011-06-09T23:59:59.000Z

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

All-Graphene Photodetectors  

Science Journals Connector (OSTI)

All-Graphene Photodetectors ... Centre for Graphene Science, College of Engineering, Mathematics, and Physical Sciences, University of Exeter, Exeter EX4 4QL, United Kingdom ... We investigate the optoelectronic properties of novel graphene/FeCl3-intercalated few-layer graphene (FeCl3FLG, dubbed graphexeter) heterostructures using photovoltage spectroscopy. ...

Freddie Withers; Thomas Hardisty Bointon; Monica Felicia Craciun; Saverio Russo

2013-04-09T23:59:59.000Z

42

Graphene Coating Coupled Emission  

E-Print Network [OSTI]

Graphene Coating Coupled Emission A COMSET, A single sheet of sp2-hybridized carbon atoms, called of graphene and its unique properties, I will present amplification of surface graphene-Ag hybrid films which when graphene is used as the spacer layer in a conventional Ag- harnessed the nonlinear properties

Shyamasundar, R.K.

43

Fox Islands Wind Project | Open Energy Information  

Open Energy Info (EERE)

Fox Islands Wind Project Fox Islands Wind Project Facility Fox Islands Wind Project Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Owner Fox Islands Electric Cooperative Developer Fox Islands Electric Cooperative Energy Purchaser Fox Islands Electric Cooperative Location Vinalhaven Island ME Coordinates 44.088391°, -68.857802° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":44.088391,"lon":-68.857802,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

44

MWRA Deer Island Wind | Open Energy Information  

Open Energy Info (EERE)

MWRA Deer Island Wind MWRA Deer Island Wind Jump to: navigation, search Name MWRA Deer Island Wind Facility MWRA Deer Island Wind Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Owner MWRA Deer Island Energy Purchaser MWRA Deer Island Location Deer Island MA Coordinates 42.346751°, -70.957006° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.346751,"lon":-70.957006,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

45

NEST Scientific Report 2007-2009 Graphene and artificial graphene  

E-Print Network [OSTI]

NEST Scientific Report 2007-2009 Graphene 43 Graphene and artificial graphene T his area-layer graphene behave like massless fermions. Graphene is a first remarkable and clean example of the impact of a potential with honeycomb structure on the electronic states and dynamics. In graphene the crystalline

Abbondandolo, Alberto

46

Electronic and Spintronic Properties of Graphene  

E-Print Network [OSTI]

and Spintronic Properties of Graphene by Ke-yu Pi Doctor ofof transition metal doped graphene over the last six years.steps including our graphene exfoliation, graphene

Pi, Keyu

2010-01-01T23:59:59.000Z

47

Visitor impact on rocky shore communities of Qeshm Island, the Persian Gulf, Iran  

Science Journals Connector (OSTI)

The influence of visitors on macroinvertebrates of rocky intertidal shores was investigated in southern coasts of the Qeshm Island, the Persian Gulf, Iran. Qeshm Island located at the...2, is the largest island i...

Fatemeh Aghajan Pour; Mohammad Reza Shokri

2013-02-01T23:59:59.000Z

48

Monhegan Island | Open Energy Information  

Open Energy Info (EERE)

Monhegan Island Monhegan Island Jump to: navigation, search Name Monhegan Island Facility Monhegan Island Sector Wind energy Facility Type Offshore Wind Facility Status Proposed Owner Maine State Dept of Conservation Developer DeepCWind Consortium Location Atlantic Ocean ME Coordinates 43.713°, -69.317° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":43.713,"lon":-69.317,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

49

Island Dynamics in the Large-Helical-Device Plasmas  

Science Journals Connector (OSTI)

In the Large Helical Device plasma discharges, the size of an externally imposed island with mode number ( n/m=1/1) decreases substantially when the plasma is collisionless ( ?*?0.1%) at the island location. For the collisional plasmas with finite beta, on the other hand, the size of the island increases. However, there is a threshold in terms of the vacuum island size below which the island enlargement is not seen.

N. Ohyabu et al.

2002-01-22T23:59:59.000Z

50

Nauru Island Effect Detection Data Set  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

During Nauru99 it was noted that the island was producing small clouds that advected over the ARM site. The Nauru Island Effect Study was run for 1.5 years and the methodology developed to detect the occurrence. Nauru ACRF downwelling SW, wind direction, and air temperature data are used, along with downwelling SW data from Licor radiometers located on the southern end of the island near the airport landing strip. A statistical analysis and comparison of data from the two locations is used to detect the likely occurrence of an island influence on the Nauru ACRF site data

Long, Chuck

51

The Electronic Structure of Single-Layer Graphene  

E-Print Network [OSTI]

2.11 Graphene Characterization Withof Bilayer Graphene . . . . . . . . . . . . . . . . . .in Monolayer Graphene Matrix Element . . . . . . . . . . .

Siegel, David Alan

2012-01-01T23:59:59.000Z

52

Surprising Quasiparticle Interactions in Graphene  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Surprising Quasiparticle Interactions in Graphene Print Surprising Quasiparticle Interactions in Graphene Print Until now, the world's electronics have been dominated by silicon, whose properties, while excellent, significantly limit the size and power consumption of today's computer chips. In order to develop ever smaller and more efficient devices, scientists have turned their attention to carbon, which can be formed into nanostructures like nanotubes, whose properties can be tuned from metallic to semiconducting. However, using carbon nanotubes for complex circuits is nearly impossible because their location and functionality in devices cannot be controlled at will, making them a poor substitute for silicon. Graphene, however, does not have these limitations. This single sheet of carbon atoms that is the building block of carbon nanotubes, C60 molecules, and graphite turns out to have similar functionality but with the added benefit that it can be grown with conventional methods and patterned into devices. Now, a group of scientists from Germany and the ALS, using angle-resolved photoemission spectroscopy (ARPES) at ALS Beamine 7.0.1, have succeeded in making the first measurement of the carrier lifetime in graphene over a wide energy scale and have found surprising new interactions that suggest new kinds of devices.

53

Surprising Quasiparticle Interactions in Graphene  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Surprising Quasiparticle Surprising Quasiparticle Interactions in Graphene Surprising Quasiparticle Interactions in Graphene Print Wednesday, 31 October 2007 00:00 Until now, the world's electronics have been dominated by silicon, whose properties, while excellent, significantly limit the size and power consumption of today's computer chips. In order to develop ever smaller and more efficient devices, scientists have turned their attention to carbon, which can be formed into nanostructures like nanotubes, whose properties can be tuned from metallic to semiconducting. However, using carbon nanotubes for complex circuits is nearly impossible because their location and functionality in devices cannot be controlled at will, making them a poor substitute for silicon. Graphene, however, does not have these limitations. This single sheet of carbon atoms that is the building block of carbon nanotubes, C60 molecules, and graphite turns out to have similar functionality but with the added benefit that it can be grown with conventional methods and patterned into devices. Now, a group of scientists from Germany and the ALS, using angle-resolved photoemission spectroscopy (ARPES) at ALS Beamine 7.0.1, have succeeded in making the first measurement of the carrier lifetime in graphene over a wide energy scale and have found surprising new interactions that suggest new kinds of devices.

54

Definition: Automated Islanding And Reconnection | Open Energy Information  

Open Energy Info (EERE)

Islanding And Reconnection Islanding And Reconnection Jump to: navigation, search Dictionary.png Automated Islanding And Reconnection Automated Islanding and Reconnection Automated islanding and reconnection is achieved by automated separation and subsequent reconnection (autonomous synchronization) of an independently operated portion of the T&D system (i.e., microgrid) from the interconnected electric grid. A microgrid is an integrated energy system consisting of interconnected loads and distributed energy resources which, as an integrated system, can operate in parallel with the grid or as an island.[1] View on Wikipedia Wikipedia Definition Islanding refers to the condition in which a distributed (DG) generator continues to power a location even though electrical grid power

55

Graphene-Multilayer Graphene Nanocomposites as Highly Efficient Thermal Interface Materials  

E-Print Network [OSTI]

resistance at the graphene-matrix interface. KEYWORDS: Graphene, thermal interface materials, nanocompositesGraphene-Multilayer Graphene Nanocomposites as Highly Efficient Thermal Interface Materials Khan M suggest that graphene-multilayer graphene nanocomposite used as the thermal interface material outperforms

56

Fire Island Wind Project | Open Energy Information  

Open Energy Info (EERE)

Island Wind Project Island Wind Project Jump to: navigation, search Name Fire Island Wind Project Facility Fire Island Wind Project Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Owner CIRI Developer Fire Island Wind LLC Energy Purchaser Chugach Location Fire Island AK Coordinates 61.144146°, -150.217652° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":61.144146,"lon":-150.217652,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

57

Wettability of Graphene  

Science Journals Connector (OSTI)

Graphene, an atomically thin two-dimensional material, has received significant attention due to its extraordinary electronic, optical, and mechanical properties. Studies focused on understanding the wettability of graphene for thermo-fluidic and surface-...

Rishi Raj; Shalabh C. Maroo; Evelyn N. Wang

2013-03-04T23:59:59.000Z

58

14 - Graphene nanoelectromechanics (NEMS)  

Science Journals Connector (OSTI)

Abstract: The use of graphene in the development of nanoscale mechanical structures is reviewed. The recent development of graphene resonators and techniques used to fabricate and characterise them is described. Some applications in sensor technology are highlighted.

Z. Moktadir

2014-01-01T23:59:59.000Z

59

Highly Deformable Graphene Kirigami  

E-Print Network [OSTI]

Graphene's exceptional mechanical properties, including its highest-known stiffness (1 TPa) and strength (100 GPa) have been exploited for various structural applications. However, graphene is also known to be quite brittle, with experimentally-measured tensile fracture strains that do not exceed a few percent. In this work, we introduce the notion of graphene kirigami, where concepts that have been used almost exclusively for macroscale structures are applied to dramatically enhance the stretchability of both zigzag and armchair graphene. Specifically, we show using classical molecular dynamics simulations that the yield and fracture strains of graphene can be enhanced by about a factor of three using kirigami as compared to standard monolayer graphene. This enhanced ductility in graphene should open up interesting opportunities not only mechanically, but also in coupling to graphene's electronic behavior.

Qi, Zenan; Campbell, David K

2014-01-01T23:59:59.000Z

60

Raman Nanometrology of Graphene.  

E-Print Network [OSTI]

??Graphene is a two-dimensional honey-comb lattice of carbon atoms with very unusual electron energy dispersion. Since its recent micromechanical isolation and measurements, graphene attracted tremendous (more)

Calizo, Irene Gonzales

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Graphene Frequency Multipliers  

E-Print Network [OSTI]

In this letter, the ambipolar transport properties of graphene flakes have been used to fabricate full-wave signal rectifiers and frequency-doubling devices. By correctly biasing an ambipolar graphene field-effect transistor ...

Wang, Han

62

Functionalization of buckled graphene.  

E-Print Network [OSTI]

??Buckled graphene produced by the halogen based etching of 6H-SiC provides a new route for the functionalization of the graphene surface. This surface provides an (more)

Nelson, Timothy C. (Timothy Chadwick)

2011-01-01T23:59:59.000Z

63

Ripping Graphene: Preferred Directions  

Science Journals Connector (OSTI)

Ripping Graphene: Preferred Directions ... Here we present experimental and theoretical studies on cracks or tears in suspended monolayer graphene membranes. ... Edges from mechanically induced ripping exhibit straight lines and are predominantly aligned in the armchair or zigzag directions of the graphene lattice. ...

Kwanpyo Kim; Vasilii I. Artyukhov; William Regan; Yuanyue Liu; M. F. Crommie; Boris I. Yakobson; A. Zettl

2011-12-12T23:59:59.000Z

64

GRAPHENE: ELECTRON PROPERTIES AND  

E-Print Network [OSTI]

GRAPHENE: ELECTRON PROPERTIES AND TRANSPORT PHENOMENA Leonid Levitov MIT Lecture notes and HW and magnetoresistance Quantum Hall effect reminder The half-integer QHE in graphene Energy gaps and splitting of Landau levels QHE in p-n and p-n-p junctions Spin transport at graphene edge Fine structure constant

Gabrieli, John

65

Mass Wasting in the Western Galapagos Islands  

E-Print Network [OSTI]

. RESULTS .............................................................................................................. 12 3.1 Cerro Azul Region ........................................................................................ 20 3.2 Le Cumbre... of the western Galapagos Islands ......................................................................... 7 3 Map of the Galapagos Islands with locations of Figures 4-33 ................... 11 4 Cerro Azul sidescan sonar data interpreted...

Hall, Hillary

2012-10-19T23:59:59.000Z

66

Island-finding ability of marine turtles  

E-Print Network [OSTI]

of the equatorial Atlantic. To test the hypothesis that turtles use wind-borne cues to locate Ascension Island we back to the island. These find- ings strongly support the hypothesis that wind-borne cues are used that hatch- ling loggerhead turtles (Caretta caretta) have the ability to perceive the inclination

Hays, Graeme

67

Thermopower of multilayer graphene  

Science Journals Connector (OSTI)

We systematically calculate thermopower of biased and unbiased multilayer graphene systems. The effect of screening to a bias field perpendicular to the graphene planes is taken into account self-consistently under the Hartree approximation. The model including nearest-neighbor hopping and the more general Slonczewski-Weiss-McClure model are both considered for a comparison. The effect of impurity scattering is studied for monolayer and unbiased bilayer graphene and is treated in terms of the self-consistent Born approximation. For a monolayer graphene, only when the effect of impurity scattering is taken into account, could all the qualitative aspects of the experimental results be correctly reproduced. Besides bilayer graphene, only trilayer graphene opens a small gap and shows a slight enhancement of thermopower under an external bias. The biased bilayer graphene shows the largest thermopower among all the systems studied.

Lei Hao and T. K. Lee

2010-12-10T23:59:59.000Z

68

Plasmonic graphene transparent conductors.  

SciTech Connect (OSTI)

Plasmonic graphene is fabricated using thermally assisted self-assembly of silver nanoparticles on graphene. The localized surface-plasmonic effect is demonstrated with the resonance frequency shifting from 446 to 495 nm when the lateral dimension of the Ag nanoparticles increases from about 50 to 150 nm. Finite-difference time-domain simulations are employed to confirm the experimentally observed light-scattering enhancement in the solar spectrum in plasmonic graphene and the decrease of both the plasmonic resonance frequency and amplitude with increasing graphene thickness. In addition, plasmonic graphene shows much-improved electrical conductance by a factor of 2-4 as compared to the original graphene, making the plasmonic graphene a promising advanced transparent conductor with enhanced light scattering for thin-film optoelectronic devices.

Xu, G.; Liu, J.; Wang, Q.; Hui, R.; Chen, Z.; Maroni, V. A.; Wu, J. (Materials Science Division); (Univ. Kansas)

2012-01-01T23:59:59.000Z

69

Edge-edge interactions in stacked graphene nanoplatelets  

SciTech Connect (OSTI)

High-resolution transmission electron microscopy (HRTEM) studies show the dynamics of small graphene platelets on larger graphene layers. The platelets move nearly freely to eventually lock in at well-defined positions close to the edges of the larger underlying graphene sheet. While such movement is driven by a shallow potential energy surface described by an interplane interaction, the lock-in position occurs by via edge-edge interactions of the platelet and the graphene surface located underneath. Here we quantitatively study this behavior using van der Waals density functional calculations. Local interactions at the open edges are found to dictate stacking configurations that are different from Bernal (AB) stacking. These stacking configurations are known to be otherwise absent in edge-free two-dimensional (2D) graphene. The results explain the experimentally observed platelet dynamics and provide a detailed account of the new electronic properties of these combined systems.

Cruz Silva, Eduardo [ORNL; Terrones Maldonado, Humberto [ORNL; Terrones Maldonado, Mauricio [ORNL; Jia, Xiaoting [Massachusetts Institute of Technology (MIT); Sumpter, Bobby G [ORNL; Dresselhaus, M [Massachusetts Institute of Technology (MIT); Meunier, V. [Rensselaer Polytechnic Institute (RPI)

2013-01-01T23:59:59.000Z

70

Hot carrier diffusion in graphene  

E-Print Network [OSTI]

We report an optical study of charge transport in graphene. Diffusion of hot carriers in epitaxial graphene and reduced graphene oxide samples are studied using an ultrafast pump-probe technique with a high spatial resolution. Spatiotemporal...

Ruzicka, Brian Andrew; Wang, Shuai; Werake, Lalani Kumari; Weintrub, Ben; Loh, Kian Ping; Zhao, Hui

2010-11-01T23:59:59.000Z

71

Bilayer Graphene Gets a Bandgap  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Bilayer Graphene Gets a Bandgap Bilayer Graphene Gets a Bandgap Print Wednesday, 26 August 2009 00:00 Graphene is the two-dimensional crystalline form of carbon whose extraordinary...

72

Renormalization group aspects of graphene  

Science Journals Connector (OSTI)

...Tsai Renormalization group aspects of graphene Maria A. H. Vozmediano * * vozmediano...Cantoblanco, , 28049 Madrid, Spain Graphene is a two-dimensional crystal of carbon...same lines. renormalization group|graphene|Coulomb interactions| 1. Introduction...

2011-01-01T23:59:59.000Z

73

Electronic Structure of Multilayer Graphene  

Science Journals Connector (OSTI)

......Articles Electronic Structure of Multilayer Graphene Hongki Min *) Allan H. MacDonald Department...the electronic structure of multilayer graphene using a pi-orbital continuum model...electronic structure of arbitrarily stacked graphene multilayers consists of chiral pseudospin......

Hongki Min; Allan H. MacDonald

2008-06-01T23:59:59.000Z

74

Categorical Exclusion Determinations: Rhode Island | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Rhode Island Rhode Island Categorical Exclusion Determinations: Rhode Island Location Categorical Exclusion Determinations issued for actions in Rhode Island. DOCUMENTS AVAILABLE FOR DOWNLOAD August 15, 2013 CX-010757: Categorical Exclusion Determination The New England Solar cost-Reduction Challenge Partnership CX(s) Applied: A9, A11 Date: 08/15/2013 Location(s): Vermont, New Hampshire, Rhode Island, Massachusetts, Connecticut Offices(s): Golden Field Office February 4, 2013 CX-010572: Categorical Exclusion Determination Brown University - Marine Hydro-Kinetic Energy Harvesting Using Cyber-Physical Systems CX(s) Applied: B3.6 Date: 02/04/2013 Location(s): Rhode Island Offices(s): Advanced Research Projects Agency-Energy October 18, 2012 CX-009518: Categorical Exclusion Determination

75

Extraordinary nonlinear plasmonics in graphene nanoislands  

E-Print Network [OSTI]

Nonlinear optical processes rely on the intrinsically weak interactions between photons enabled by their coupling with matter. Unfortunately, many applications in nonlinear optics are severely hindered by the small response of conventional materials. Metallic nanostructures partially alleviate this situation, as the large light enhancement associated with their localized plasmons amplifies their nonlinear response to record high levels. Graphene hosts long-lived, electrically tunable plasmons that also interact strongly with light. Here we show that the nonlinear polarizabilities of graphene nanoislands can be electrically tuned to surpass by several orders of magnitude those of metal nanoparticles of similar size. This extraordinary behavior extends over the visible and near-infrared for islands consisting of hundreds of carbon atoms doped with moderate carrier densities. Our quantum-mechanical simulations of the plasmon-enhanced optical response of nanographene reveal this material as an ideal platform for ...

Cox, Joel D

2014-01-01T23:59:59.000Z

76

Long Island Solar Farm | Brookhaven National Laboratory  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Long Island Solar Farm Long Island Solar Farm Project Overview The Long Island Solar Farm (LISF) is a 32-megawatt solar photovoltaic power plant built through a collaboration including BP Solar, the Long Island Power Authority (LIPA), and the Department of Energy. The LISF, located on the Brookhaven National Laboratory site, began delivering power to the LIPA grid in November 2011, and is currently the largest solar photovoltaic power plant in the Eastern United States. It is generating enough renewable energy to power approximately 4,500 homes, and is helping New York State meet its clean energy and carbon reduction goals. Project Developer/Owner/Operator: Long Island Solar Farm, LLC (BP Solar & MetLife) Purchaser of Power: Long Island Power Authority (LIPA) purchases 100

77

Block Island Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Block Island Wind Farm Block Island Wind Farm Jump to: navigation, search Name Block Island Wind Farm Facility Block Island Wind Farm Sector Wind energy Facility Type Commercial Scale Wind Facility Status Proposed Developer Deepwater Wind Location Offshore from Block Island RI Coordinates 41.1°, -71.53° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.1,"lon":-71.53,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

78

Bilayer Graphene Gets a Bandgap  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Bilayer Graphene Gets a Bandgap Print Graphene is the two-dimensional crystalline form of carbon whose extraordinary electron mobility and other unique features hold great promise...

79

Surprising Quasiparticle Interactions in Graphene  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Surprising Quasiparticle Interactions in Graphene Surprising Quasiparticle Interactions in Graphene Print Wednesday, 31 October 2007 00:00 Until now, the world's electronics have...

80

Epitaxial Graphene - Energy Innovation Portal  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Epitaxial Graphene Brookhaven National Laboratory Contact BNL About This Technology

Scanning electron micrographs of epitaxial graphene grown on ruthenium films atop patterned...

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Search for: graphene | DOE PAGES  

Office of Scientific and Technical Information (OSTI)

graphene Find + Advanced Search Advanced Search All Fields: graphene Title: Full Text: Bibliographic Data: Creator Author: Name Name ORCID Search Authors Type: All Accepted...

82

Metals on graphene: correlation between adatom adsorption behavior and growth morphology  

SciTech Connect (OSTI)

We present a systematic study of metal adatom adsorption on graphene by ab initio calculations. The calculations cover alkali metals, sp-simple metals, 3d and group 10 transition metals, noble metals, as well as rare earth metals. The correlation between the adatom adsorption properties and the growth morphology of the metals on graphene is also investigated. We show that the growth morphology is related to the ratio of the metal adsorption energy to its bulk cohesive energy (E(a)/E(c)) and the diffusion barrier (?E) of the metal adatom on graphene. Charge transfer, electric dipole and magnetic moments, and graphene lattice distortion induced by metal adsorption would also affect the growth morphologies of the metal islands. We also show that most of the metal nanostructures on graphene would be thermally stable against coarsening.

Liu, Xiaojie; Wang, Cai-Zhuang; Hupalo, Myron; Lu, Wencai; Tringides, Michael C.; Yao, Yongxin; Ho, Kai-Ming

2012-05-19T23:59:59.000Z

83

Juvenile marine fishes of Harbor Island, Texas  

E-Print Network [OSTI]

(December, 1977) Robert Eugene Bonin, B. S. , Heidelberg College Chairman of Advisory Committee: Dr. Thomas Bright A one-year study was made of juvenile marine fishes in the shallow water grass flats of Harbor Island, Texas. Samples were taken at each... the flats of llarbor Island . 91 vi 1 1 LIST OF FIGURES FIGURE PME Location of Harbor Island Location of collection sites. Beam trawl used in study. Seasonal changes in average salinity on the flats 17 Seasonal changes in average water temperature...

Bonin, Robert Eugene

2012-06-07T23:59:59.000Z

84

Graphene antidot lattice waveguides  

Science Journals Connector (OSTI)

We introduce graphene antidot lattice waveguides: nanostructured graphene where a region of pristine graphene is sandwiched between regions of graphene antidot lattices. The band gaps in the surrounding antidot lattices enable localized states to emerge in the central waveguide region. We model the waveguides via a position-dependent mass term in the Dirac approximation of graphene and arrive at analytical results for the dispersion relation and spinor eigenstates of the localized waveguide modes. To include atomistic details we also use a tight-binding model, which is in excellent agreement with the analytical results. The waveguides resemble graphene nanoribbons, but without the particular properties of ribbons that emerge due to the details of the edge. We show that electrons can be guided through kinks without additional resistance and that transport through the waveguides is robust against structural disorder.

Jesper Goor Pedersen; Tue Gunst; Troels Markussen; Thomas Garm Pedersen

2012-12-11T23:59:59.000Z

85

Trifluoromethylation of graphene  

SciTech Connect (OSTI)

We demonstrate trifluoromethylation of graphene by copper-catalyzed free radical reaction. The covalent addition of CF{sub 3} to graphene, which changes the carbon atom hybridization from sp{sup 2} to sp{sup 3}, and modifies graphene in a homogeneous and nondestructive manner, was verified with Raman spectroscopy, atomic force microscopy, and X-ray photoelectron spectroscopy. X-ray photoelectron spectroscopy reveals that CF{sub 3} groups are grafted to the basal plane of graphene, with about 4 at. % CF{sub 3} coverage. After trifluoromethylation, the average resistance increases by nearly one order of magnitude, and an energy gap of about 98 meV appears. The noninvasive and mild reaction to synthesize trifluoromethylated graphene paves the way for graphene's applications in electronics and biomedical areas.

Zhou, Lin; Zhou, Lushan; Wang, Xi; Yu, Jingwen; Yang, Mingmei; Wang, Jianbo; Peng, Hailin, E-mail: zfliu@pku.edu.cn, E-mail: hlpeng@pku.edu.cn; Liu, Zhongfan, E-mail: zfliu@pku.edu.cn, E-mail: hlpeng@pku.edu.cn [Center for Nanochemistry, Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871 (China)

2014-09-01T23:59:59.000Z

86

Electrical and Thermoelectrical Transport Properties of Graphene  

E-Print Network [OSTI]

IV Large Memory Effect in Graphene Based Devices IV-1Transport Properties of Graphene A Dissertation submitted into study the new material, graphene. By investigating the

Wang, Deqi

2011-01-01T23:59:59.000Z

87

Graphene Growth on Low Carbon Solubility Metals  

E-Print Network [OSTI]

The electronic properties of graphene. Reviews of Modernand E.A. Sutter, Epitaxial graphene on ruthenium. Natureopening in epitaxial graphene. Nature Materials, 2007. 6(

Wofford, Joseph Monroe

2012-01-01T23:59:59.000Z

88

Local Density of States in Graphene  

E-Print Network [OSTI]

Continuum Hamiltonian for the graphene in the presence of afingerprints for adatoms in graphene: scanning tunnelingxi 4.10 Graphene LDOS at the adatom site (top carbon case)

Yang, Ling

2011-01-01T23:59:59.000Z

89

Electronic Transport in Few-layer Graphene  

E-Print Network [OSTI]

in Charge Neutral Bilayer Graphene Introduction In thisstudy on heterogeneous graphene devices in a differentto probe few layer graphene to determine their dependence on

Zhao, Zeng

2013-01-01T23:59:59.000Z

90

Electrical Transport in Carbon Nanotubes and Graphene  

E-Print Network [OSTI]

Introduction to Carbon Nanotubes and Graphene Single wallCarbon nanotubes and graphene are the most popular Carbonin the Normal Metal Graphene Superconductor Junctions

Liu, Gang

2010-01-01T23:59:59.000Z

91

Electrical and Mechanical Properties of Graphene  

E-Print Network [OSTI]

Transport in a Suspended Graphene Sheet, Phys. Rev. Lett. ,Novoselov, The rise of graphene, Nat. Mater. , 6 (2007) [24]mobility in suspended graphene, Sol. State Commun. , 146 (

Bao, Wenzhong

2011-01-01T23:59:59.000Z

92

SciTech Connect: Enabling graphene nanoelectronics.  

Office of Scientific and Technical Information (OSTI)

Enabling graphene nanoelectronics. Citation Details In-Document Search Title: Enabling graphene nanoelectronics. Enabling graphene nanoelectronics. Recent work has shown that...

93

Graphene Veils and Sandwiches  

Science Journals Connector (OSTI)

Graphene Veils and Sandwiches ... It readily yields stacks of graphene (or other two-dimensional sheets) separated by virtually any kind of guest species. ... The new material can be sandwich like, for which the guest species are relatively closely spaced and form a near-continuous inner layer of the sandwich, or veil like, where the guest species are widely separated, with each guest individually draped within a close-fitting, protective yet atomically thin graphene net or veil. ...

Jong Min Yuk; Kwanpyo Kim; Benjamn Alemn; William Regan; Ji Hoon Ryu; Jungwon Park; Peter Ercius; Hyuck Mo Lee; A. Paul Alivisatos; Michael F. Crommie; Jeong Yong Lee; Alex Zettl

2011-07-19T23:59:59.000Z

94

Fourier optics on graphene  

Science Journals Connector (OSTI)

Using numerical simulations, here, we demonstrate that a single sheet of graphene with properly designed inhomogeneous, nonuniform conductivity distributions can act as a convex lens for focusing and collimating the transverse-magnetic (TM) surface plasmon polariton (SPP) surface waves propagating along the graphene. Consequently, we show that the graphene can act as a platform for obtaining spatial Fourier transform of infrared (IR) SPP signals. This may lead to rebirth of the field of Fourier optics on a 1-atom-thick structure.

Ashkan Vakil and Nader Engheta

2012-02-27T23:59:59.000Z

95

Graphene synthesis & graphene/polymer nanocomposites.  

E-Print Network [OSTI]

??Graphene, a two-dimensional carbon sheet with single-atom thickness, has recently attracted significant interest due to its unique mechanical and electrical properties. It has been reported (more)

Liao, Ken-Hsuan

2012-01-01T23:59:59.000Z

96

Epitaxial graphene on silicon carbide: Introduction to structured graphene  

E-Print Network [OSTI]

Epitaxial graphene on silicon carbide: Introduction to structured graphene Ming Ruan 1 , Yike Hu 1, France Abstract We present an introduction to the rapidly growing field of epitaxial graphene on silicon present, highly evolved state. The potential of epitaxial graphene as a new electronic material is now

Paris-Sud XI, Université de

97

Graphene Integrated Microwave Photonics  

Science Journals Connector (OSTI)

This paper proposes and analyzes the incorporation of graphene to integrated waveguides and circuits for application to the field of microwave photonics (MWP). We discuss the main...

Capmany, Jos; Domnech, David; Muoz, Pascual

2014-01-01T23:59:59.000Z

98

Semiconducting graphene nanomeshes  

Science Journals Connector (OSTI)

Symmetry arguments are used to describe all possible two-dimensional periodic corrugations of graphene (nanomeshes) capable of inducing the tangible semiconducting gaps. Such nanomeshes or superlattices break the initial graphene translational symmetry in a way that produces mixing and subsequent splitting of the Dirac K and K? states. All of them have hexagonal Bravais lattice and are described by space groups that are subgroups of the graphene group. The first-principles calculations show that the gaps of about 0.5 eV can be induced at strains safely smaller than the graphene failure strain. Experimental realization with the use of lattice mismatching and tailored substrates is discussed.

I. I. Naumov and A. M. Bratkovsky

2012-05-25T23:59:59.000Z

99

Graphene Andreev billiards  

Science Journals Connector (OSTI)

We studied the energy levels of graphene-based Andreev billiards consisting of a superconductor region on top of a monolayer graphene sheet. For the case of Andreev retroreflection we show that the graphene-based Andreev billiard can be mapped to the normal-metal-superconducting billiards with the same geometry. We also derived a semiclassical quantization rule in graphene-based Andreev billiards. The exact and the semiclassically obtained spectrum agree very well both for the case of Andreev retroreflection and specular Andreev reflection.

Jzsef Cserti; Imre Hagymsi; Andor Kormnyos

2009-08-17T23:59:59.000Z

100

Graphene Monolayer Rotation on Ni(111) Facilities Bilayer Graphene Growth  

SciTech Connect (OSTI)

Synthesis of bilayer graphene by chemical vapor deposition is of importance for graphene-based field effect devices. Here, we demonstrate that bilayer graphene preferentially grows by carbon-segregation under graphene sheets that are rotated relative to a Ni(111) substrate. Rotated graphene monolayer films can be synthesized at growth temperatures above 650 C on a Ni(111) thin-film. The segregated second graphene layer is in registry with the Ni(111) substrate and this suppresses further C-segregation, effectively self-limiting graphene formation to two layers.

Batzill M.; Sutter P.; Dahal, A.; Addou, R.

2012-06-11T23:59:59.000Z

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Long Island STEM Hub Summit  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Questionnaire Questionnaire Event Information pulldown Registered Attendees Directions to Event Campus Map (pdf) Local Weather Visiting Brookhaven Disclaimer Event Date December 6, 2011 Event Location SUNY Farmingdale State College 2350 Broadhollow Road Farmingdale, NY 11735-1021 USA Roosevelt Hall Directions | Campus Map (pdf) Event Coordinator Ken White Bus: 631-344-7171 Fax: 631-344-5832 Email: stemhub@bnl.gov Long Island STEM Hub Summit Join us for the Launch of the Long Island Regional STEM Hub Motivation The LI Regional STEM Hub, one of ten forming in the Empire State STEM Learning Network, will focus on preparing students for the Long Island workforce through enhanced science, technology, engineering, and mathematics (STEM) experiences for students and teachers. Academic relevance will serve as the major theme by making it easy for

102

Graphene-Silicon Schottky Diodes  

Science Journals Connector (OSTI)

Graphene-Silicon Schottky Diodes ... We have fabricated graphene-silicon Schottky diodes by depositing mechanically exfoliated graphene on top of silicon substrates. ... The IV characteristics measured at 100, 300, and 400 K indicate that temperature strongly influences the ideality factor of graphenesilicon Schottky diodes. ...

Chun-Chung Chen; Mehmet Aykol; Chia-Chi Chang; A. F. J. Levi; Stephen B. Cronin

2011-04-25T23:59:59.000Z

103

3 - Chemically derived graphene  

Science Journals Connector (OSTI)

Abstract: The synthesis of graphene via chemical functionalisation of graphite is reviewed, including investigations that unravelled the atomic structure of resulting graphene oxide (GO) sheets in the suspension. The fundamental properties of GO are discussed and a summary of recent advances in device applications is provided.

R.S. Sundaram

2014-01-01T23:59:59.000Z

104

What is graphene?  

Science Journals Connector (OSTI)

Graphene is a 2D material with a honeycomb lattice structure made of sp2 bonded carbon atoms. Graphene is essentially the mother of all graphitic materials - it can be formed into buckyballs and nanotubes, etched into nanoribbons, or stacked into bulk ...

Raghunath Murali; James D. Meindl

2009-08-01T23:59:59.000Z

105

Highly durable graphene nanoplatelets supported Pt nanocatalysts...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

durable graphene nanoplatelets supported Pt nanocatalysts for oxygen reduction . Highly durable graphene nanoplatelets supported Pt nanocatalysts for oxygen reduction . Abstract:...

106

Tunable Electrochemical Properties of Fluorinated Graphene. ...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Tunable Electrochemical Properties of Fluorinated Graphene. Tunable Electrochemical Properties of Fluorinated Graphene. Abstract: The structural and electrochemical properties of...

107

Polyoxometalate-Graphene Nanocomposite Modified Electrode for...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Polyoxometalate-Graphene Nanocomposite Modified Electrode for Electrocatalytic Detection of Ascorbic Acid. Polyoxometalate-Graphene Nanocomposite Modified Electrode for...

108

Nitrogen-doped Graphene and Its Electrochemical Applications...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

doped Graphene and Its Electrochemical Applications. Nitrogen-doped Graphene and Its Electrochemical Applications. Abstract: Nitrogen-doped graphene (N-graphene) is obtained by...

109

SciTech Connect: Hot electron dynamics in graphene  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ThesisDissertation: Hot electron dynamics in graphene Citation Details In-Document Search Title: Hot electron dynamics in graphene Hot electron dynamics in graphene Graphene, a...

110

Bluewater Wind Rhode Island | Open Energy Information  

Open Energy Info (EERE)

Rhode Island Rhode Island Jump to: navigation, search Name Bluewater Wind Rhode Island Facility Bluewater Wind Rhode Island Sector Wind energy Facility Type Offshore Wind Facility Status Proposed Owner NRG Bluewater Wind Developer NRG Bluewater Wind Location Atlantic Ocean RI Coordinates 41.357°, -71.152° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.357,"lon":-71.152,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

111

Argonne CNM News: STM of individual grains in CVD-grown graphene  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

STM of individual grains in CVD-grown graphene STM of individual grains in CVD-grown graphene SEM of 3d supercrystals The first scanning tunneling microscopy (STM) images of graphene synthesized on copper foil. (b-d) show atomic-resolution images at various locations of the large graphene domain shown in (a). NMAT June 2011 Users from Purdue University, working collaboratively with staff in the Electronic & Magnetic Materials & Devices Group, studied CVD-grown graphene on polycrystalline copper foil for the first time at the atomic-scale. The ultrahigh vacuum scanning tunneling microscopy (UHV-STM) findings performed at the Center for Nanoscale Materials (CNM) will help to guide the optimization of synthesis towards defect-free graphene. The focus of this study was to investigate the quality of the films and

112

Graphene and Graphene Oxide: Biofunctionalization and Applications in Biotechnology  

SciTech Connect (OSTI)

Graphene is the basic building block of zero-dimensional fullerene, 1D carbon nanotubes, and 3D graphite. Graphene has a unique planar structure as well as novel electronic properties, which have attracted great interest from scientists. This review selectively analyzes current advances in the field of graphene bioapplications. In particular, the functionalization of graphene for biological applications, FRET-based biosensor development by using graphene-based nanomaterials, and the investigation of graphene for living cell studies have been summarized in more details. Future perspectives and possible challenges in this rapidly developing area are also discussed.

Wang, Ying; Li, Zhaohui; Wang, Jun; Li, Jinghong; Lin, Yuehe

2011-05-01T23:59:59.000Z

113

Bilayer Graphene Gets a Bandgap  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Bilayer Graphene Gets a Bandgap Bilayer Graphene Gets a Bandgap Bilayer Graphene Gets a Bandgap Print Wednesday, 26 August 2009 00:00 Graphene is the two-dimensional crystalline form of carbon whose extraordinary electron mobility and other unique features hold great promise for nanoscale electronics and photonics. But without a bandgap, graphene's promise can't be realized. As with monolayer graphene, bilayer graphene also has a zero bandgap and thus behaves like a metal. But a bandgap can be introduced if an electric displacement field is applied to the two layers; the material then behaves like a semiconductor. A team of researchers from Berkeley has engineered a bandgap in bilayer graphene that can be precisely controlled from 0 to 250 meV. With precision control of its bandgap over a wide range, plus independent manipulation of its electronic states through electrical doping, dual-gated bilayer graphene becomes a remarkably flexible tool for nanoscale electronic devices.

114

Bilayer Graphene Gets a Bandgap  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Bilayer Graphene Gets a Bandgap Bilayer Graphene Gets a Bandgap Bilayer Graphene Gets a Bandgap Print Wednesday, 26 August 2009 00:00 Graphene is the two-dimensional crystalline form of carbon whose extraordinary electron mobility and other unique features hold great promise for nanoscale electronics and photonics. But without a bandgap, graphene's promise can't be realized. As with monolayer graphene, bilayer graphene also has a zero bandgap and thus behaves like a metal. But a bandgap can be introduced if an electric displacement field is applied to the two layers; the material then behaves like a semiconductor. A team of researchers from Berkeley has engineered a bandgap in bilayer graphene that can be precisely controlled from 0 to 250 meV. With precision control of its bandgap over a wide range, plus independent manipulation of its electronic states through electrical doping, dual-gated bilayer graphene becomes a remarkably flexible tool for nanoscale electronic devices.

115

Controlling Graphene's Electronic Structure  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Controlling Graphene's Electronic Structure Print Controlling Graphene's Electronic Structure Print Graphene, because of its unusual electron properties, reduced dimensionality, and scale, has enormous potential for use in ultrafast electronic transistors. It exhibits high conductivity and an anomalous quantum Hall effect (a phenomenon exhibited by certain semiconductor devices at low temperatures and high magnetic fields). Among its novel properties, graphene's electrical charge carriers (electrons and holes) move through a solid with effectively zero mass and constant velocity, like photons. Graphene's intrinsically low scattering rate from defects implies the possibility of a new kind of electronics based on the manipulation of electrons as waves rather than particles. The primary technical difficulty has been controlling the transport of electrical charge carriers through the sheet. This area of research is known as bandgap engineering. While bandgap engineering is the basis of semiconductor technology, it is only now being applied to graphene. Using angle-resolved photoemission spectroscopy (ARPES) at ALS Beamline 7.0.1, a team of scientists from the ALS and Germany characterized the electronic band structure and successfully controlled the gap between valence and conduction bands in a bilayer of graphene thin films deposited on a substrate of silicon carbide. This was done by doping one sheet with adsorbed potassium atoms, creating an asymmetry between the two layers.

116

Raman Spectrum of Graphene and Graphene Layers  

Science Journals Connector (OSTI)

Graphene is the two-dimensional building block for carbon allotropes of every other dimensionality. We show that its electronic structure is captured in its Raman spectrum that clearly evolves with the number of layers. The D peak second order changes in shape, width, and position for an increasing number of layers, reflecting the change in the electron bands via a double resonant Raman process. The G peak slightly down-shifts. This allows unambiguous, high-throughput, nondestructive identification of graphene layers, which is critically lacking in this emerging research area.

A. C. Ferrari; J. C. Meyer; V. Scardaci; C. Casiraghi; M. Lazzeri; F. Mauri; S. Piscanec; D. Jiang; K. S. Novoselov; S. Roth; A. K. Geim

2006-10-30T23:59:59.000Z

117

Hot carrier diffusion in graphene  

Science Journals Connector (OSTI)

We report an optical study of charge transport in graphene. Diffusion of hot carriers in epitaxial graphene and reduced graphene-oxide samples are studied using an ultrafast pump-probe technique with a high spatial resolution. Spatiotemporal dynamics of hot carriers after a pointlike excitation are monitored. Carrier-diffusion coefficients of 11?000 and 5500?cm2?s?1 are measured in epitaxial graphene and reduced graphene-oxide samples, respectively, with a carrier temperature on the order of 3600 K. The demonstrated optical techniques can be used for noncontact and noninvasive in situ detection of transport properties of graphene.

Brian A. Ruzicka; Shuai Wang; Lalani K. Werake; Ben Weintrub; Kian Ping Loh; Hui Zhao

2010-11-08T23:59:59.000Z

118

Shielding vacuum fluctuations with graphene  

E-Print Network [OSTI]

The Casimir-Polder interaction of ground-state and excited atoms with graphene is investigated with the aim to establish whether graphene systems can be used as a shield for vacuum fluctuations of an underlying substrate. We calculate the zero-temperature Casimir-Polder potential from the reflection coefficients of graphene within the framework of the Dirac model. For both doped and undoped graphene we show limits at which graphene could be used effectively as a shield. Additional results are given for AB-stacked bilayer graphene.

Sofia Ribeiro; Stefan Scheel

2014-03-14T23:59:59.000Z

119

Electronic Cooling in Graphene  

Science Journals Connector (OSTI)

Energy transfer to acoustic phonons is the dominant low-temperature cooling channel of electrons in a crystal. For cold neutral graphene we find that the weak cooling power of its acoustic modes relative to their heat capacity leads to a power-law decay of the electronic temperature when far from equilibrium. For heavily doped graphene a high electronic temperature is shown to initially decrease linearly with time at a rate proportional to n3/2 with n being the electronic density. The temperature at which cooling via optical phonon emission begins to dominate depends on graphene carrier density.

R. Bistritzer and A. H. MacDonald

2009-05-21T23:59:59.000Z

120

Binding Graphene Sheets Together Using Silicon: Graphene/Silicon Superlattice  

Science Journals Connector (OSTI)

We propose a superlattice consisting of graphene and monolayer thick Si sheets and investigate ... not only strengthen the interlayer binding between the graphene sheets compared to that in graphite, but also inj...

Yong Zhang; Raphael Tsu

2010-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Planar graphene-narrow-gap semiconductor-graphene heterostructure  

Science Journals Connector (OSTI)

A planar heterostructure composed of two graphene films between which a narrow-gap semiconductor ... paradox is absent when conical points of the graphene Brillouin zone are in the band gap...

P. V. Ratnikov; A. P. Silin

2008-11-01T23:59:59.000Z

122

Pacific Ocean Islands Editorial Introduction  

Science Journals Connector (OSTI)

Islands in the Pacific Ocean are of three kinds (Nunn 2005). ... Most of the islands lie in the SW Pacific, but the Galapagos, Clipperton, and Easter ... Island are volcanic islands rising from the East Pacific R...

2010-01-01T23:59:59.000Z

123

Graphene on Ru(0001): Evidence for two graphene band structures  

SciTech Connect (OSTI)

High-resolution photoemission illustrates that the band structure of graphene on Ru(0001) exhibits a well-defined splitting. This splitting is largest with the graphene directly on the Ru(0001) substrate, whereas with a chemisorbed oxygen spacer layer between the graphene and the metal substrate, this splitting is considerably reduced. This splitting is attributed to a combination of chemical interactions between graphene and Ru(0001) and to screening of the former by the latter, not spin-orbit coupling.

Katsiev K.; Vescovo E.; Losovyj, Y.; Zhou, Z.; Liu, L.; Dowben, P.A.; Goodman, D.W.

2012-05-03T23:59:59.000Z

124

Graphene's 3D Counterpart  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Print ALS researchers have discovered a material that is essentially a 3D version of graphene-the 2D sheets of carbon through which electrons race at many times the speed at which...

125

Levitated Spinning Graphene  

E-Print Network [OSTI]

A method is described for levitating micron-sized few layer graphene flakes in a quadrupole ion trap. Starting from a liquid suspension containing graphene, charged flakes are injected into the trap using the electrospray ionization technique and are probed optically. At micro-torr pressures, torques from circularly polarized light cause the levitated particles to rotate at frequencies >1 MHz, which can be inferred from modulation of light scattering off the rotating flake when an electric field resonant with the rotation rate is applied. Possible applications of these techniques will be presented, both to fundamental measurements of the mechanical and electronic properties of graphene and to new approaches to graphene crystal growth, modification and manipulation.

B. E. Kane

2010-06-18T23:59:59.000Z

126

Graphene's 3D Counterpart  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

08:59 ALS researchers have discovered a material that is essentially a 3D version of graphene-the 2D sheets of carbon through which electrons race at many times the speed at which...

127

Uncertainties in Gapped Graphene  

E-Print Network [OSTI]

Motivated by graphene-based quantum computer we examine the time-dependence of the position-momentum and position-velocity uncertainties in the monolayer gapped graphene. The effect of the energy gap to the uncertainties is shown to appear via the Compton-like wavelength $\\lambda_c$. The uncertainties in the graphene are mainly contributed by two phenomena, spreading and zitterbewegung. While the former determines the uncertainties in the long-range of time, the latter gives the highly oscillation to the uncertainties in the short-range of time. The uncertainties in the graphene are compared with the corresponding values for the usual free Hamiltonian $\\hat{H}_{free} = (p_1^2 + p_2^2) / 2 M$. It is shown that the uncertainties can be under control within the quantum mechanical law if one can choose the gap parameter $\\lambda_c$ freely.

Eylee Jung; Kwang S. Kim; DaeKil Park

2011-07-27T23:59:59.000Z

128

Multiply folded graphene  

Science Journals Connector (OSTI)

The folding of paper, hide, and woven fabric has been used for millennia to achieve enhanced articulation, curvature, and visual appeal for intrinsically flat, two-dimensional materials. For graphene, an ideal two-dimensional material, folding may transform it to complex shapes with new and distinct properties. Here, we present experimental results that folded structures in graphene, termed grafold, exist, and their formations can be controlled by introducing anisotropic surface curvature during graphene synthesis or transfer processes. Using pseudopotential-density-functional-theory calculations, we also show that double folding modifies the electronic band structure of graphene. Furthermore, we demonstrate the intercalation of C60 into the grafolds. Intercalation or functionalization of the chemically reactive folds further expands grafold's mechanical, chemical, optical, and electronic diversity.

Kwanpyo Kim; Zonghoon Lee; Brad D. Malone; Kevin T. Chan; Benjamn Alemn; William Regan; Will Gannett; M. F. Crommie; Marvin L. Cohen; A. Zettl

2011-06-27T23:59:59.000Z

129

Bainbridge Island Data Dashboard  

Broader source: Energy.gov [DOE]

The data dashboard for Bainbridge Island, a partner in the U.S. Department of Energy's Better Buildings Neighborhood Program.

130

Quantum Dots in Graphene  

Science Journals Connector (OSTI)

We suggest a way of confining quasiparticles by an external potential in a small region of a graphene strip. Transversal electron motion plays a crucial role in this confinement. Properties of thus obtained graphene quantum dots are investigated theoretically for different types of the boundary conditions at the edges of the strip. The (quasi)bound states exist in all systems considered. At the same time, the dependence of the conductance on the gate voltage carries information about the shape of the edges.

P. G. Silvestrov and K. B. Efetov

2007-01-03T23:59:59.000Z

131

Faraday rotation in graphene  

E-Print Network [OSTI]

We study magneto--optical properties of monolayer graphene by means of quantum field theory methods in the framework of the Dirac model. We reveal a good agreement between the Dirac model and a recent experiment on giant Faraday rotation in cyclotron resonance. We also predict other regimes when the effects are well pronounced. The general dependence of the Faraday rotation and absorption on various parameters of samples is revealed both for suspended and epitaxial graphene.

I. V. Fialkovsky; D. V. Vassilevich

2012-03-20T23:59:59.000Z

132

Thermodynamics of graphene  

Science Journals Connector (OSTI)

Abstract The 21st century has brought a lot of new results related to graphene. Apparently, graphene has been characterized from all points of view except surface science and, especially, surface thermodynamics. This report aims to close this gap. Since graphene is the first real two-dimensional solid, a general formulation of the thermodynamics of two-dimensional solid bodies is given. The two-dimensional chemical potential tensor coupled with stress tensor is introduced, and fundamental equations are derived for energy, free energy, grand thermodynamic potential (in the classical and hybrid forms), enthalpy, and Gibbs energy. The fundamentals of linear boundary phenomena are formulated with explaining the concept of a dividing line, the mechanical and thermodynamic line tensions, line energy and other linear properties with necessary thermodynamic equations. The one-dimensional analogs of the Gibbs adsorption equation and ShuttleworthHerring relation are presented. The general thermodynamic relationships are illustrated with calculations based on molecular theory. To make the reader sensible of the harmony of chemical and van der Waals forces in graphene, the remake of the classical graphite theory is presented with additional variable combinations of graphene sheets. The calculation of the line energy of graphene is exhibited including contributions both from chemical bonds and van der Waals forces (expectedly, the latter are considerably smaller than the former). The problem of graphene holes originating from migrating vacancies is discussed on the basis of the GibbsCurie principle. An important aspect of line tension is the planar sheet/nanotube transition where line tension acts as a driving force. Using the bending stiffness of graphene, the possible radius range is estimated for achiral (zigzag and armchair) nanotubes.

A.I. Rusanov

2014-01-01T23:59:59.000Z

133

Bilayer Graphene Gets a Bandgap  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Bilayer Graphene Gets a Bandgap Print Bilayer Graphene Gets a Bandgap Print Graphene is the two-dimensional crystalline form of carbon whose extraordinary electron mobility and other unique features hold great promise for nanoscale electronics and photonics. But without a bandgap, graphene's promise can't be realized. As with monolayer graphene, bilayer graphene also has a zero bandgap and thus behaves like a metal. But a bandgap can be introduced if an electric displacement field is applied to the two layers; the material then behaves like a semiconductor. A team of researchers from Berkeley has engineered a bandgap in bilayer graphene that can be precisely controlled from 0 to 250 meV. With precision control of its bandgap over a wide range, plus independent manipulation of its electronic states through electrical doping, dual-gated bilayer graphene becomes a remarkably flexible tool for nanoscale electronic devices.

134

Bilayer Graphene Gets a Bandgap  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Bilayer Graphene Gets a Bandgap Print Bilayer Graphene Gets a Bandgap Print Graphene is the two-dimensional crystalline form of carbon whose extraordinary electron mobility and other unique features hold great promise for nanoscale electronics and photonics. But without a bandgap, graphene's promise can't be realized. As with monolayer graphene, bilayer graphene also has a zero bandgap and thus behaves like a metal. But a bandgap can be introduced if an electric displacement field is applied to the two layers; the material then behaves like a semiconductor. A team of researchers from Berkeley has engineered a bandgap in bilayer graphene that can be precisely controlled from 0 to 250 meV. With precision control of its bandgap over a wide range, plus independent manipulation of its electronic states through electrical doping, dual-gated bilayer graphene becomes a remarkably flexible tool for nanoscale electronic devices.

135

Bilayer Graphene Gets a Bandgap  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Bilayer Graphene Gets a Bandgap Print Bilayer Graphene Gets a Bandgap Print Graphene is the two-dimensional crystalline form of carbon whose extraordinary electron mobility and other unique features hold great promise for nanoscale electronics and photonics. But without a bandgap, graphene's promise can't be realized. As with monolayer graphene, bilayer graphene also has a zero bandgap and thus behaves like a metal. But a bandgap can be introduced if an electric displacement field is applied to the two layers; the material then behaves like a semiconductor. A team of researchers from Berkeley has engineered a bandgap in bilayer graphene that can be precisely controlled from 0 to 250 meV. With precision control of its bandgap over a wide range, plus independent manipulation of its electronic states through electrical doping, dual-gated bilayer graphene becomes a remarkably flexible tool for nanoscale electronic devices.

136

Bilayer Graphene Gets a Bandgap  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Bilayer Graphene Gets a Bandgap Print Bilayer Graphene Gets a Bandgap Print Graphene is the two-dimensional crystalline form of carbon whose extraordinary electron mobility and other unique features hold great promise for nanoscale electronics and photonics. But without a bandgap, graphene's promise can't be realized. As with monolayer graphene, bilayer graphene also has a zero bandgap and thus behaves like a metal. But a bandgap can be introduced if an electric displacement field is applied to the two layers; the material then behaves like a semiconductor. A team of researchers from Berkeley has engineered a bandgap in bilayer graphene that can be precisely controlled from 0 to 250 meV. With precision control of its bandgap over a wide range, plus independent manipulation of its electronic states through electrical doping, dual-gated bilayer graphene becomes a remarkably flexible tool for nanoscale electronic devices.

137

Twist Solves Bilayer Graphene Mystery  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Twist Solves Bilayer Graphene Mystery Print Researchers have discovered a unique new twist to the story of graphene and, in the process, appear to have solved a mystery that has...

138

Twist Solves Bilayer Graphene Mystery  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Twist Solves Bilayer Graphene Mystery Twist Solves Bilayer Graphene Mystery Print Wednesday, 26 March 2014 00:00 Researchers have discovered a unique new twist to the story of...

139

GREEN HOMES LONG ISLAND  

E-Print Network [OSTI]

GREEN HOMES LONG ISLAND Town of Babylon Steve Bellone, Supervisor green your house, slash your to introduce Long Island Green Homes, an innovative program that will help residents make their homes more energy-efficient and reduce our community's carbon footprint. Why do we call it Long Island Green Homes

Kammen, Daniel M.

140

New methanol plant for Kharg Island  

SciTech Connect (OSTI)

Iran`s National Petrochemical Co. (NPC; Teheran) plans to set up a world scale export-oriented methanol plant on Kharg Island in the Persian Gulf. It says discussions are being held with three Western groups - C. Itoh (Tokyo), H & G (London), and Uhde (Dortmund) - to supply the 660,000-m.t./year facility. The estimated $150-million project would be repaid through export of methanol within three to four years. NPC hopes to conclude talks this year. Strategically located, Kharg Island is described as a good location in peacetime. It already serves as an oil terminal. NPC has an LPG and sulfur complex there.

Alperowicz, N.

1992-04-08T23:59:59.000Z

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Chirality and Correlations in Graphene  

Science Journals Connector (OSTI)

Graphene is described at low energy by a massless Dirac equation whose eigenstates have definite chirality. We show that the tendency of Coulomb interactions in lightly doped graphene to favor states with larger net chirality leads to suppressed spin and charge susceptibilities. Our conclusions are based on an evaluation of graphenes exchange and random-phase-approximation correlation energies. The suppression is a consequence of the quasiparticle chirality switch which enhances quasiparticle velocities near the Dirac point.

Yafis Barlas; T. Pereg-Barnea; Marco Polini; Reza Asgari; A. H. MacDonald

2007-06-05T23:59:59.000Z

142

Materials: Graphene can desalinate water  

Science Journals Connector (OSTI)

... Graphene promises to be many times more permeable to water than conventional membranes used in desalination, the authors say. ...

2012-06-20T23:59:59.000Z

143

Block Island Power Co | Open Energy Information  

Open Energy Info (EERE)

Block Island Power Co Block Island Power Co Jump to: navigation, search Name Block Island Power Co Place Rhode Island Utility Id 1857 Utility Location Yes Ownership I NERC Location NPCC NERC NPCC Yes Operates Generating Plant Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] Energy Information Administration Form 826[2] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png No rate schedules available. Average Rates Residential: $0.4450/kWh Commercial: $0.4670/kWh The following table contains monthly sales and revenue data for Block Island Power Co (Rhode Island). Month RES REV (THOUSAND $) RES SALES (MWH) RES CONS COM REV (THOUSAND $) COM SALES (MWH) COM CONS IND_REV (THOUSAND $) IND SALES (MWH) IND CONS OTH REV (THOUSAND $) OTH SALES (MWH) OTH CONS TOT REV (THOUSAND $) TOT SALES (MWH) TOT CONS

144

The effect of substrates on the Raman spectrum of graphene: Graphene-on-sapphire and graphene-on-glass  

E-Print Network [OSTI]

The effect of substrates on the Raman spectrum of graphene: Graphene- on-sapphire and graphene The authors investigated the influence of substrates on Raman scattering spectrum from graphene. The room-temperature Raman signatures from graphene layers on GaAs, sapphire, and glass substrates were compared with those

145

Epitaxial Graphene on Cu(111)  

Science Journals Connector (OSTI)

Epitaxial Graphene on Cu(111) ... The growth of graphene on single crystal Cu(111) has been achieved by thermal decomposition of ethylene in an ultrahigh vacuum chamber for the first time. ... The structural and electronic properties of graphene on Cu(111) have been investigated by scanning tunneling microscopy and spectroscopy. ...

Li Gao; Jeffrey R. Guest; Nathan P. Guisinger

2010-08-02T23:59:59.000Z

146

Ultrafast Graphene Oxide Humidity Sensors  

Science Journals Connector (OSTI)

Ultrafast Graphene Oxide Humidity Sensors ... Graphene oxide can be exploited in humidity and temperature sensors with a number of convenient features such as flexibility, transparency and suitability for large-scale manufacturing. ... Here we show that the two-dimensional nature of graphene oxide and its superpermeability to water combine to enable humidity sensors with unprecedented response speed (?30 ms response and recovery times). ...

Stefano Borini; Richard White; Di Wei; Michael Astley; Samiul Haque; Elisabetta Spigone; Nadine Harris; Jani Kivioja; Tapani Ryhnen

2013-11-09T23:59:59.000Z

147

Graphene Growth and Device Integration  

E-Print Network [OSTI]

screens, photonic applications, energy generation, and batteries [3], [12], [13]. The first graphene filmsINVITED P A P E R Graphene Growth and Device Integration This paper describes one of the emerging methods for growing grapheneVthe chemical vapor deposition methodVwhich is based on a catalytic reaction

148

Plasmons in Graphene: Fundamental Properties  

E-Print Network [OSTI]

INVITED P A P E R Plasmons in Graphene: Fundamental Properties and Potential Applications in graphene have intriguing fundamen- tal properties and hold great potential for applications. They enable via gate voltage, providing an advantage for graphene's plasmons over surface plasmons (SPs

Soljaèiæ, Marin

149

University of Rhode Island | Open Energy Information  

Open Energy Info (EERE)

Rhode Island Rhode Island Jump to: navigation, search Hydro | Hydrodynamic Testing Facilities Name University of Rhode Island Address Department of Ocean Engineering, Sheets Building, Bay Campus Place Narragansett, Rhode Island Zip 02882 Sector Hydro Phone number (401) 874-6139 Website http://www.oce.uri.edu/baycamp Coordinates 41.3983403°, -71.4893013° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.3983403,"lon":-71.4893013,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

150

Island Energy Solutions | Open Energy Information  

Open Energy Info (EERE)

Island Energy Solutions Island Energy Solutions Jump to: navigation, search Name Island Energy Solutions Place Kailua, Hawaii Zip 96734 Product Island Energy Solutions, Inc. is an electrical contracting company, based out of Kailua, Oahu, Hawaii. Coordinates 21.396572°, -157.740068° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":21.396572,"lon":-157.740068,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

151

Probing graphene defects and estimating graphene quality with optical microscopy  

SciTech Connect (OSTI)

We report a simple and accurate method for detecting graphene defects that utilizes the mild, dry annealing of graphene/Cu films in air. In contrast to previously reported techniques, our simple approach with optical microscopy can determine the density and degree of dislocation of defects in a graphene film without inducing water-related damage or functionalization. Scanning electron microscopy, confocal Raman and atomic force microscopy, and X-ray photoelectron spectroscopy analysis were performed to demonstrate that our nondestructive approach to characterizing graphene defects with optimized thermal annealing provides rapid and comprehensive determinations of graphene quality.

Lai, Shen [SKKU Advanced Institute of Nanotechnology (SAINT), Suwon 440-746 (Korea, Republic of); Center for Human Interface Nanotechnology (HINT), Suwon 440-746 (Korea, Republic of); Kyu Jang, Sung [SKKU Advanced Institute of Nanotechnology (SAINT), Suwon 440-746 (Korea, Republic of); Jae Song, Young, E-mail: yjsong@skku.edu [SKKU Advanced Institute of Nanotechnology (SAINT), Suwon 440-746 (Korea, Republic of); Department of Physics, Sungkyunkwan University (SKKU), Suwon 440-746 (Korea, Republic of); Lee, Sungjoo, E-mail: leesj@skku.edu [SKKU Advanced Institute of Nanotechnology (SAINT), Suwon 440-746 (Korea, Republic of); Center for Human Interface Nanotechnology (HINT), Suwon 440-746 (Korea, Republic of); College of Information and Communication Engineering, Sungkyunkwan University (SKKU), Suwon 440-746 (Korea, Republic of)

2014-01-27T23:59:59.000Z

152

The Long Island Solar Farm  

Broader source: Energy.gov [DOE]

This technical report provides an in-depth look at the one SunShot Initiative success story, the Long Island Solar Farm project, which is a utility-scale solar array located at Brookhaven National Laboratory in Eastern Long Island, New York. Three aspects of this project make it remarkable: first, it is the largest utility-scale solar power plant in the Eastern United States; second, it is a commercial project built on federally administered public lands; and third, the project was very unlikely to have started in the first place. It is a valuable resource for solar energy research, which will greatly inform large-scale PV solar development in the East.

153

Cobalt intercalation at the graphene/iridium(111) interface: Influence of rotational domains, wrinkles, and atomic steps  

SciTech Connect (OSTI)

Using low-energy electron microscopy, we study Co intercalation under graphene grown on Ir(111). Depending on the rotational domain of graphene on which it is deposited, Co is found intercalated at different locations. While intercalated Co is observed preferentially at the substrate step edges below certain rotational domains, it is mostly found close to wrinkles below other domains. These results indicate that curved regions (near substrate atomic steps and wrinkles) of the graphene sheet facilitate Co intercalation and suggest that the strength of the graphene/Ir interaction determines which pathway is energetically more favorable.

Vlaic, S.; Kimouche, A.; Coraux, J.; Rougemaille, N. [CNRS, Inst NEEL, F-38042 Grenoble (France) [CNRS, Inst NEEL, F-38042 Grenoble (France); Univ. Grenoble Alpes, Inst NEEL, F-38042 Grenoble (France); Santos, B.; Locatelli, A. [Elettra-Sincrotrone Trieste S.C.p.A., S.S: 14 km 163.5 in AREA Science Park, I-34149 Basovizza, Trieste (Italy)] [Elettra-Sincrotrone Trieste S.C.p.A., S.S: 14 km 163.5 in AREA Science Park, I-34149 Basovizza, Trieste (Italy)

2014-03-10T23:59:59.000Z

154

Graphene-based structure, method of suspending graphene membrane, and method of depositing material onto graphene membrane  

DOE Patents [OSTI]

An embodiment of a method of suspending a graphene membrane across a gap in a support structure includes attaching graphene to a substrate. A pre-fabricated support structure having the gap is attached to the graphene. The graphene and the pre-fabricated support structure are then separated from the substrate which leaves the graphene membrane suspended across the gap in the pre-fabricated support structure. An embodiment of a method of depositing material includes placing a support structure having a graphene membrane suspended across a gap under vacuum. A precursor is adsorbed to a surface of the graphene membrane. A portion of the graphene membrane is exposed to a focused electron beam which deposits a material from the precursor onto the graphene membrane. An embodiment of a graphene-based structure includes a support structure having a gap, a graphene membrane suspended across the gap, and a material deposited in a pattern on the graphene membrane.

Zettl, Alexander K.; Meyer, Jannik Christian

2013-04-02T23:59:59.000Z

155

Kauai Island Utility Cooperative | Open Energy Information  

Open Energy Info (EERE)

Island Utility Cooperative Island Utility Cooperative Jump to: navigation, search Name Kauai Island Utility Cooperative Place Hawaii Utility Id 10071 Utility Location Yes Ownership C NERC Location HICC Operates Generating Plant Yes Activity Generation Yes Activity Transmission Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] Energy Information Administration Form 826[2] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png D Residential Service Residential General Light and Power Service Schedule G Commercial General Light and Power Service Schedule J Commercial Large Power Secondary Schedule P Industrial Large Power Service Schedule L Industrial

156

Thermal plasmonic interconnects in graphene  

Science Journals Connector (OSTI)

As one emerging plasmonic material, graphene can support surface plasmons at infrared and terahertz frequencies with unprecedented properties due to the strong interactions between graphene and low-frequency photons. Since graphene surface plasmons exist in the infrared and terahertz regime, they can be thermally pumped (excited) by the infrared evanescent waves emitted from an object. Here we show that thermal graphene plasmons can be efficiently excited and have monochromatic and tunable spectra, thus paving a way to harness thermal energy for graphene plasmonic devices. We further demonstrate that thermal information communication via graphene surface plasmons can be potentially realized by effectively harnessing thermal energy from various heat sources, e.g., the waste heat dissipated from nanoelectronic devices. These findings open up an avenue of thermal plasmonics based on graphene for different applications ranging from infrared emission control, to information processing and communication, to energy harvesting.

Baoan Liu; Yongmin Liu; Sheng Shen

2014-11-10T23:59:59.000Z

157

Geographic and Temporal Variability of Middle Holocene Red Abalone Middens on San Miguel Island, California  

E-Print Network [OSTI]

Bight and the northern Channel Islands with locations of the red abalone sites discussed in the text Journal of California and Great Basin

Braje, Todd J

2007-01-01T23:59:59.000Z

158

E-Print Network 3.0 - aeolian islands southern Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

on Gavdos Island (located South of Crete Krijgsman et al., 1995), using FCM applied to a carefully chosen... such as the former southern Aegean landmass and northern...

159

Graphene-Base Hot-Electron Transistor  

E-Print Network [OSTI]

B. H. ; Wang, K. L. "Vertical Graphene-Base Hot-Electronoperation in single-layer graphene ferroelectric memory",of Dirac Point Energy at the Graphene/Oxide Interface", Nano

Zeng, Caifu

2014-01-01T23:59:59.000Z

160

Aspects of the theory of graphene  

Science Journals Connector (OSTI)

...Electronic and photonic properties of graphene layers and carbon nanoribbons' compiled...Oleksiy Roslyak Aspects of the theory of graphene Norman J. Morgenstern Horing * * nhoring...of the device-friendly features of graphene, recent work on its Greens functions...

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Chemistry at the Dirac Point of Graphene  

E-Print Network [OSTI]

Martinez, G. Epitaxial Graphene. Solid State Commun. 2007,92-100. Boehm, H. P. Graphene-How a Laboratory CuriosityK. S. The Rise of Graphene. Nat. Mater. 2007, Novoselov, K.

Sarkar, Santanu

2013-01-01T23:59:59.000Z

162

A Model Graphene Diffraction Pattern Frank Rioux  

E-Print Network [OSTI]

A Model Graphene Diffraction Pattern Frank Rioux The purpose of this tutorial is to model graphene d Pj k px j py k 2 i 1 A Graphene Model Diffraction Pattern #12;

Rioux, Frank

163

Electromechanical Properties of Suspended Graphene Nanoribbons  

E-Print Network [OSTI]

Electromechanical Properties of Suspended Graphene Nanoribbons Oded Hod* School of Chemistry Manuscript Received May 19, 2009 ABSTRACT Graphene nanoribbons present diverse electronic properties ranging theory considerations, we find a remarkable Young's modulus value of 7 TPa for ultranarrow graphene

Hod, Oded

164

Defect Scattering in Graphene  

Science Journals Connector (OSTI)

Irradiation of graphene on SiO2 by 500eV Ne and He ions creates defects that cause intervalley scattering as is evident from a significant Raman D band intensity. The defect scattering gives a conductivity proportional to charge carrier density, with mobility decreasing as the inverse of the ion dose. The mobility decrease is 4 times larger than for a similar concentration of singly charged impurities. The minimum conductivity decreases proportional to the mobility to values lower than 4e2/?h, the minimum theoretical value for graphene free of intervalley scattering. Defected graphene shows a diverging resistivity at low temperature, indicating insulating behavior. The results are best explained by ion-induced formation of lattice defects that result in midgap states.

Jian-Hao Chen; W. G. Cullen; C. Jang; M. S. Fuhrer; E. D. Williams

2009-06-12T23:59:59.000Z

165

Localized Spins on Graphene  

Science Journals Connector (OSTI)

The problem of a magnetic impurity, atomic or molecular, absorbed on top of a carbon atom in otherwise clean graphene is studied using the numerical renormalization group. The spectral, thermodynamic, and scattering properties of the impurity are described in detail. In the presence of a small magnetic field, the low-energy electronic features of graphene make it possible to inject spin-polarized currents through the impurity using a scanning tunneling microscope. Furthermore, the impurity scattering becomes strongly spin dependent and for a finite impurity concentration it leads to spin-polarized bulk currents and a large magnetoresistance. In gated graphene the impurity spin is Kondo screened at low temperatures. However, at temperatures larger than the Kondo temperature, the anomalous magnetotransport properties are recovered.

P. S. Cornaglia; Gonzalo Usaj; C. A. Balseiro

2009-01-27T23:59:59.000Z

166

Pseudodiffusive magnetotransport in graphene  

Science Journals Connector (OSTI)

Transport properties through wide and short ballistic graphene junctions are studied in the presence of arbitrary dopings and magnetic fields. No dependence on the magnetic field is observed at the Dirac point for any current cumulant, just as in a classical diffusive system, both in normal-graphene-normal and normal-graphene-superconductor junctions. This pseudodiffusive regime is, however, extremely fragile with respect to doping at finite fields. We identify the crossovers to a field-suppressed and a normal ballistic transport regime in the magnetic-field-doping parameter space, and provide a physical interpretation of the phase diagram. Remarkably, pseudodiffusive transport is recovered away from the Dirac point in resonance with Landau levels at high magnetic fields.

Elsa Prada; Pablo San-Jose; Bernhard Wunsch; Francisco Guinea

2007-03-27T23:59:59.000Z

167

Syntactic Islands in Uyghur  

E-Print Network [OSTI]

negative NON.PST non-past tense NP noun phrase PART participle PL plural POSS possessive SCO Strong Crossover SG singular TP tense phrase VP verb phrase WCO Weak Crossover 1 1. Introduction In this thesis, I... provide a survey of island effects in Modern Standard Uyghur (ISO 639-3: uig)1, consisting of complex noun phrases, wh-islands, coordinate structures, and crossover effects. This investigation includes restrictions on scrambling out of islands and covert...

Major, Travis

2014-05-31T23:59:59.000Z

168

Shot Noise in Graphene  

Science Journals Connector (OSTI)

We report measurements of current noise in single-layer and multilayer graphene devices. In four single-layer devices, including a p-n junction, the Fano factor remains constant to within 10% upon varying carrier type and density, and averages between 0.35 and 0.38. The Fano factor in a multilayer device is found to decrease from a maximal value of 0.33 at the charge-neutrality point to 0.25 at high carrier density. These results are compared to theories for shot noise in ballistic and disordered graphene.

L. DiCarlo; J. R. Williams; Yiming Zhang; D. T. McClure; C. M. Marcus

2008-04-14T23:59:59.000Z

169

Quantum pumping in graphene  

Science Journals Connector (OSTI)

We show that graphene-based quantum pumps can tap into evanescent modes, which penetrate deeply into the device as a consequence of Klein tunneling. The evanescent modes dominate pumping at the Dirac point, and give rise to a universal response under weak driving for short and wide pumps, in close analogy to their role in the minimal conductivity in ballistic transport. In contrast, evanescent modes contribute negligibly to normal pumps. Our findings add an incentive for the exploration of graphene-based nanoelectronic devices.

E. Prada; P. San-Jose; H. Schomerus

2009-12-10T23:59:59.000Z

170

Intervalley plasmons in graphene  

Science Journals Connector (OSTI)

The spectrum of two-dimensional (2D) plasma waves in graphene has been recently studied in the Dirac fermion model. We take into account the whole dispersion relation for graphene electrons in the tight-binding approximation and the local-field effects in the electrodynamic response. Near the wave vectors close to the corners of the hexagon-shaped Brillouin zone we find low-frequency 2D plasmon modes with a linear spectrum. These intervalley plasmon modes are related to the transitions between the two nearest Dirac cones.

T. Tudorovskiy and S. A. Mikhailov

2010-08-24T23:59:59.000Z

171

Pseudospin magnetism in graphene  

Science Journals Connector (OSTI)

We predict that neutral graphene bilayers are pseudospin magnets in which the charge density contribution from each valley and spin spontaneously shifts to one of the two layers. The band structure of this system is characterized by a momentum-space vortex, which is responsible for unusual competition between band and kinetic energies, leading to symmetry breaking in the vortex core. We discuss the possibility of realizing a pseudospin version of ferromagnetic metal spintronics in graphene bilayers based on hysteresis associated with this broken symmetry.

Hongki Min; Giovanni Borghi; Marco Polini; A. H. MacDonald

2008-01-17T23:59:59.000Z

172

Saint Paul Island Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Island Wind Farm Island Wind Farm Jump to: navigation, search Name Saint Paul Island Wind Farm Facility Saint Paul Island Sector Wind energy Facility Type Community Wind Facility Status In Service Owner Tanadgusix Corp. Developer Tanadgusix Corp. Energy Purchaser Tanadgusix Corp. Location St. Paul Island AK Coordinates 57.1761°, -170.269° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":57.1761,"lon":-170.269,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

173

Mustang Island Offshore Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Mustang Island Offshore Wind Farm Mustang Island Offshore Wind Farm Jump to: navigation, search Name Mustang Island Offshore Wind Farm Facility Mustang Island Offshore Wind Farm Sector Wind energy Facility Type Offshore Wind Facility Status Proposed Owner Baryonyx Corporation Developer Baryonyx Corporation Location Offshore from Mustang Island TX Coordinates 27.66°, -97.01° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":27.66,"lon":-97.01,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

174

Rules Establishing Minimum Standards Relating to Location, Design,  

Broader source: Energy.gov (indexed) [DOE]

Rules Establishing Minimum Standards Relating to Location, Design, Rules Establishing Minimum Standards Relating to Location, Design, Construction, and Maintenance of Onsite Wastewater Treatment Systems (Rhode Island) Rules Establishing Minimum Standards Relating to Location, Design, Construction, and Maintenance of Onsite Wastewater Treatment Systems (Rhode Island) < Back Eligibility Agricultural Commercial Construction Fed. Government Fuel Distributor General Public/Consumer Industrial Installer/Contractor Institutional Investor-Owned Utility Local Government Low-Income Residential Multi-Family Residential Municipal/Public Utility Nonprofit Residential Retail Supplier Rural Electric Cooperative Schools State/Provincial Govt Systems Integrator Transportation Tribal Government Utility Program Info State Rhode Island Program Type Environmental Regulations

175

Graphene sustained nonlinear modes in dielectric waveguides  

Science Journals Connector (OSTI)

We discuss the existence of nonlinear modes sustained by graphene layers in dielectric waveguides. Taking advantage of the almost two dimensional nature of graphene, we introduce the...

Auditore, Aldo; De Angelis, Costantino; Locatelli, Andrea; Boscolo, Stefano; Midrio, Michele; Romagnoli, Marco; Capobianco, Antonio-Daniele; Nalesso, Gianfranco

2013-01-01T23:59:59.000Z

176

Sandia National Laboratories: 3-D graphene architecture  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

graphene architecture Three-Dimensional Graphene Architectures On July 29, 2013, in Capabilities, Materials Science, News, News & Events, Office of Science, Research & Capabilities...

177

A Roadmap for Engineering Piezoelectricity in Graphene  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Roadmap for Engineering Piezoelectricity in Graphene A Roadmap for Engineering Piezoelectricity in Graphene Doping this 'Miracle Material' May Lead to New Array of Nanoscale...

178

Facile and controllable electrochemical reduction of graphene...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and controllable electrochemical reduction of graphene oxide and its applications. Facile and controllable electrochemical reduction of graphene oxide and its applications....

179

Graphene Growth on Low Carbon Solubility Metals.  

E-Print Network [OSTI]

??Advances in synthesis are imperative if graphene is to fulfill its scientific and technological potential. Single crystal graphene of is currently available only in the (more)

Wofford, Joseph Monroe

2012-01-01T23:59:59.000Z

180

First Observation of Plasmarons in Graphene  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

First Observation of Plasmarons in Graphene First Observation of Plasmarons in Graphene Print Wednesday, 30 June 2010 00:00 An international team of scientists performing...

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Developing Functionalized Graphene Materials for Biomass Conversion...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Developing Functionalized Graphene Materials for Biomass Conversion The goal of this research is to develop low cost catalysts based on graphene-derived nanomaterials, and use them...

182

The Dirac Point of Photonic Graphene  

Science Journals Connector (OSTI)

Photonic graphene is an optical analogue to electronic graphene. We introduce Dirac maps to design a structure of alumina rods and experimentally demonstrate the existence of an Dirac...

de Dood, Michiel J

183

Magnetism of Single Vacancies in Rippled Graphene  

Science Journals Connector (OSTI)

Magnetism of Single Vacancies in Rippled Graphene ... Our results suggest that any magnetism induced by vacancies that occurs in graphene can be controlled by applying strain. ...

E. J. G. Santos; S. Riikonen; D. Snchez-Portal; A. Ayuela

2012-03-02T23:59:59.000Z

184

Washington: Graphene Nanostructures for Lithium Batteries Recieves...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Washington: Graphene Nanostructures for Lithium Batteries Recieves 2012 R&D 100 Award Washington: Graphene Nanostructures for Lithium Batteries Recieves 2012 R&D 100 Award February...

185

Microwave and optical saturable absorption in graphene  

Science Journals Connector (OSTI)

We report on the first experiments on saturable absorption in graphene at microwave frequency band. Almost independent of the incident frequency, microwave absorbance of graphene...

Zheng, Zhiwei; Zhao, Chujun; Lu, Shunbin; Chen, Yu; Li, Ying; Zhang, Han; Wen, Shuangchun

2012-01-01T23:59:59.000Z

186

Chemistry at the Dirac Point of Graphene  

E-Print Network [OSTI]

Haddon, R. C. Covalent Chemistry for Graphene Electronics.P. K. ; Yang, J. X. The Chemistry of Graphene. J. Mater.R. C. Organometallic Chemistry of Extended Periodic ?-

Sarkar, Santanu

2013-01-01T23:59:59.000Z

187

Graphene: from functionalization to devices  

Science Journals Connector (OSTI)

The year 2014 marks the first decade of the rise of graphene. Graphene, a single atomic layer of carbon atoms in sp2 bonding configuration having a honeycomb structure, has now become a well-known and well-established material. Among some of its many outstanding fundamental properties, one can mention a very high carrier mobility, a very large spin diffusion length, unsurpassed mechanical properties as graphene is the strongest material ever measured and an exceptional thermal conductivity scaling more than one order of magnitude above that of copper. After the first years of the graphene rush, graphene growth is now well controlled using various methods like epitaxial growth on silicon carbide substrate, chemical vapour deposition (CVD) or plasma techniques on metal, insulator or semiconductor substrates. More applied research is now taking over the initial studies on graphene production. Indeed, graphene is a promising material for many advanced applications such as, but not limited to, electronic, spintronics, sensors, photonics, micro/nano-electromechanical (MEMS/NEMS) systems, super-capacitors or touch-screen technologies. In this context, this Special Issue of the Journal of Physics D: Applied Physics on graphene reviews some of the recent achievements, progress and prospects in this field. It includes a collection of seventeen invited articles covering the current status and future prospects of some selected topics of strong current interest. This Special Issue is organized in four sections. The first section is dedicated to graphene devices, and opens with an article by de Heer et al on an investigation of integrating graphene devices with silicon complementary metaloxidesemiconductor (CMOS) technology. Then, a study by Svintsov et al proposes a lateral all-graphene tunnel field-effect transistor (FET) with a high on/off current switching ratio. Next, Tsukagoshi et al present how a band-gap opening occurs in a graphene bilayer by using a perpendicular electric field to operate logic gates. Plaais et al then show the realization of graphene microwave nano-transistors that are especially suitable for fast charge detectors. Matsumoto et al describe next some interesting graphene-based biosensor applications, while the following article by Otsuji et al shows recent advances in plasmonics in terahertz device applications. This section ends with the Dollfus et al article dealing with non-linear effects in graphene devices investigated by simulation methods. The second section concerns the electronic and transport properties and includes four articles. The first one by Gurzadyan et al provides an investigation of graphene oxide in water by femtosecond pumpprobe spectroscopy to study its transient absorption properties. Jouault et al then review the quantum Hall effect of self-organized graphene monolayers epitaxially grown on the C-face of SiC. Next, Petkovic et al report on the observation of edge magneto-plasmons in graphene. Finally, Roche and Valenzuela focus on the limits of conventional views in graphene spin transport and offer novel perspectives for further progress. The third section addresses graphene tailoring and functionalization as studied by Genorio and Znidarsic for graphene nanoribbons, or by atomic intercalation as shown by the two articles from Starke and Forti, and from Bisson et al. The last section is devoted to graphene growth and morphology. Ogino et al first describe a method to grow graphene on insulating substrates using polymer films as a carbon source. Then, Suemitsu et al show the recent progresses in epitaxial graphene formation on cubic silicon carbide thin films. Finally, Norimatsu and Kusunoki investigate the structural properties and morphology of epitaxial graphene grown on hexagonal silicon carbide substrates by using a high-resolution transmission electron microscope, their article closing this Special Issue .

Antonio Tejeda; Patrick G Soukiassian

2014-01-01T23:59:59.000Z

188

Screening in multilayer graphene  

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In this paper, we study the static polarization in ABC-stacked multilayer graphene. Since the density of states diverges for these systems if the number of layers exceeds three, screening effects are expected to be important. In the random phase approximation, screening can be included through the polarization. We derive an analytical integral expression for the polarization in both the full-band model and an effective two-band model. Numerical evaluation of these integrals is very time consuming in the full-band model. Hence, for ABC-stacked trilayer graphene, we use the two-band model to calculate the low momentum part of the polarization. The results for the two-band model are universal, i.e., independent of doping. The high momentum part is linear and is determined by calculating two points, such that we can determine the slope. For ABC stacked trilayer graphene, the slope is given by three times the monolayer value. We compare our results to previous ones in the literature and discuss the similarities and discrepancies. Our results can be used to include screening in ABC-stacked multilayer systems in a way that all the characteristics of the polarization function are included. The numerical results for the polarization of trilayer graphene are used to sketch the screened potential.

Ralph van Gelderen; Richard Olsen; C. Morais Smith

2013-09-09T23:59:59.000Z

189

RKKY interaction in graphene  

Science Journals Connector (OSTI)

We consider RKKY interaction between two magnetic impurities in graphene. The consideration is based on the perturbation theory for the thermodynamic potential in the imaginary time representation. We analyze the symmetry of the RKKY interaction on the bipartite lattice at half filling. Our analytical calculation of the interaction is based on direct evaluation of real space spin susceptibility.

E. Kogan

2011-09-19T23:59:59.000Z

190

Graphene nanoribbon crossbar nanomesh  

Science Journals Connector (OSTI)

Graphene nanoribbon crossbars exhibit negative differential resistance. This nonlinear current-voltage response can be exploited in a nanomesh geometry for high-density logic or memory. A 2xN crossbar array can store 3N states. Proof-of-principle of ...

K. M. M. Habib; A. Khitun; A. A. Balandin; R. K. Lake

2011-06-01T23:59:59.000Z

191

Anisotropic Spin Relaxation in Graphene  

Science Journals Connector (OSTI)

Spin relaxation in graphene is investigated in electrical graphene spin valve devices in the nonlocal geometry. Ferromagnetic electrodes with in-plane magnetizations inject spins parallel to the graphene layer. They are subject to Hanle spin precession under a magnetic field B applied perpendicular to the graphene layer. Fields above 1.5T force the magnetization direction of the ferromagnetic contacts to align to the field, allowing injection of spins perpendicular to the graphene plane. A comparison of the spin signals at B=0 and B=2??T shows a 20% decrease in spin relaxation time for spins perpendicular to the graphene layer compared to spins parallel to the layer. We analyze the results in terms of the different strengths of the spin-orbit effective fields in the in-plane and out-of-plane directions and discuss the role of the Elliott-Yafet and Dyakonov-Perel mechanisms for spin relaxation.

N. Tombros; S. Tanabe; A. Veligura; C. Jozsa; M. Popinciuc; H. T. Jonkman; B. J. van Wees

2008-07-25T23:59:59.000Z

192

Cayman Islands: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Cayman Islands: Energy Resources Cayman Islands: Energy Resources Jump to: navigation, search Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"TERRAIN","zoom":5,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"390px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":19.5,"lon":-80.66667,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

193

Rhode Island: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Rhode Island: Energy Resources Rhode Island: Energy Resources Jump to: navigation, search Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"TERRAIN","zoom":6,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"500px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.5800945,"lon":-71.4774291,"alt":0,"address":"Rhode

194

Marshall Islands: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Marshall Islands: Energy Resources Marshall Islands: Energy Resources Jump to: navigation, search Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"TERRAIN","zoom":5,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"390px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":10,"lon":167,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

195

Solomon Islands: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Solomon Islands: Energy Resources Solomon Islands: Energy Resources Jump to: navigation, search Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"TERRAIN","zoom":5,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"390px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":-8,"lon":159,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

196

Novel Growth Mechanism of Epitaxial Graphene on Metals  

Science Journals Connector (OSTI)

Even islands formed from six mobile clusters are unlikely to immediately transform into graphene, but instead pass through a series of intermediate structures. ... For simplicity, we have omitted refinements to these equations, such as capture numbers, that make them more realistic,(12, 20) but also more computationally cumbersome(21) Thus, our proposed rate equations are sufficiently minimal to enable a straightforward optimization of parameters, while retaining enough physical content to permit a detailed interrogation of experimental data. ... Physical Review B: Condensed Matter and Materials Physics (2009), 80 (16), 161403/1-161403/4 CODEN: PRBMDO; ISSN:1098-0121. ...

Andrew Zangwill; Dimitri D. Vvedensky

2011-04-15T23:59:59.000Z

197

Processable Conducting Polyaniline, Carbon Nanotubes, Graphene and Their Composites  

E-Print Network [OSTI]

Polyaniline, Carbon Nanotubes, Graphene and Their CompositesPolyaniline, Carbon Nanotubes, Graphene and Their Compositespolyaniline (PANI), carbon nanotubes (CNTs) and graphene.

Wang, Kan

2014-01-01T23:59:59.000Z

198

Optical Determination of Gate--Tunable Bandgap in Bilayer Graphene  

E-Print Network [OSTI]

Tunable Bandgap in Bilayer Graphene Yuanbo Zhang* 1 , Tsung-gate-tunable bandgap in graphene bilayers with magnitude asbands. In two- dimensional graphene bilayers this bandgap

Zhang, Yuanbo

2010-01-01T23:59:59.000Z

199

Experimental Studies of Oxide Magnetic Tunnel Junctions and Graphene  

E-Print Network [OSTI]

electron interaction in graphene. The central Nernst peak83, 6694 (1998). Chapter IV Introduction to Graphene IV-1Discovery of Graphene Carbon-based electronic materials have

Liu, Xinfei

2012-01-01T23:59:59.000Z

200

Hierarchically Porous Graphene as a Lithium-Air Battery Electrode...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Hierarchically Porous Graphene as a Lithium-Air Battery Electrode. Hierarchically Porous Graphene as a Lithium-Air Battery Electrode. Abstract: Functionalized graphene sheets (FGS)...

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Graphene-supported tunable waveguide structure in the terahertz regime  

Science Journals Connector (OSTI)

The tunable waveguide properties of the graphene supporting structure SiSiO2graphenedielectricsgrapheneSiO2Si...

He, Xiaoyong; Kim, Sangin

2013-01-01T23:59:59.000Z

202

Graphene as the Ultimate Membrane for Gas Separation Project...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Graphene as the Ultimate Membrane for Gas Separation Graphene as the Ultimate Membrane for Gas Separation GraphenePore.jpg Key Challenges: Investigate the permeability and...

203

Graphene Layer Growth: Collision of Migrating Five-Member Rings  

E-Print Network [OSTI]

Monte Carlo simulations of graphene edge buildup, the rateGraphene layer growth: Collision of migrating five- memberon the zigzag edge of a graphene layer. The process is

Whitesides, Russell; Kollias, Alexander C.; Domin, Dominik; Lester Jr., William A.; Frenklach, Michael

2005-01-01T23:59:59.000Z

204

Graphene and its Hybrid Nanostructures for Nanoelectronics and Energy Applications  

E-Print Network [OSTI]

modification of graphene. Advanced Materials, 2008. 20 (16):S. Novoselov. The rise of graphene. Nature Materials, 2007.transport in suspended graphene. Nature Nanotechnology,

LIN, JIAN

2011-01-01T23:59:59.000Z

205

Processable Conducting Polyaniline, Carbon Nanotubes, Graphene and Their Composites  

E-Print Network [OSTI]

Chapter 5 Solvothermal Reduced Graphene Oxide Dispersionsin Organic Solvents Graphene is a single-atom-thick sheet of5 Solvothermal Reduced Graphene Oxide Dispersions in Organic

Wang, Kan

2014-01-01T23:59:59.000Z

206

Computational Modeling of Graphene Oxide Exfoliation and Lithium Storage Characteristics.  

E-Print Network [OSTI]

??Graphene oxide is a two dimensional material obtained by adsorption of oxygen or oxygen-containing groups on graphene. Stacked layers of graphene oxide constitute graphite oxide. (more)

Mortezaee, Reza

2013-01-01T23:59:59.000Z

207

SciTech Connect: Graphene resonators : analysis and film transfer...  

Office of Scientific and Technical Information (OSTI)

Technical Report: Graphene resonators : analysis and film transfer. Citation Details In-Document Search Title: Graphene resonators : analysis and film transfer. Graphene resonators...

208

American Samoa's Rebate Program Brings ENERGY STAR to Island | Department  

Broader source: Energy.gov (indexed) [DOE]

American Samoa's Rebate Program Brings ENERGY STAR to Island American Samoa's Rebate Program Brings ENERGY STAR to Island American Samoa's Rebate Program Brings ENERGY STAR to Island August 13, 2010 - 12:00pm Addthis American Samoa is located in the South Pacific Ocean, with temperature around 80 degrees year round. | Photo courtesy of Maleleg American Samoa is located in the South Pacific Ocean, with temperature around 80 degrees year round. | Photo courtesy of Maleleg Lindsay Gsell American Samoa, a small island of 66,000 residents in the Pacific Ocean, is a warm 80 degrees almost year round, but during the summer, the humidity can make it feel downright hot. Because of its remote location, appliances and electricity are costly - and until recently, home air conditioning units were fairly rare. Now thanks to a $100,000 grant through the American Recovery and

209

Graphene growth on glass 1 Synthesis of conducting transparent few-layer graphene directly  

E-Print Network [OSTI]

Graphene growth on glass 1 Synthesis of conducting transparent few-layer graphene directly on glass major hurdles that research has to overcome to get graphene out of research laboratories. Here, using transparent graphene layers at temperatures as low as 450 °C. Our few-layer graphene grows at the interface

Paris-Sud XI, Université de

210

Spectroscopic Raman Nanometrology of Graphene and Graphene Multilayers on Arbitrary Substrates  

E-Print Network [OSTI]

Spectroscopic Raman Nanometrology of Graphene and Graphene Multilayers on Arbitrary Substrates I to be an effective tool for characterization of graphene and graphene multilayers on the standard Si/SiO2 (300 nm) substrates, which allows one to determine non-destructively the number of the graphene layers and assess

211

Hydrogen adsorption on Graphene and Nitrogen Doped Graphene Monolayers: A First Principles Study  

E-Print Network [OSTI]

Hydrogen adsorption on Graphene and Nitrogen Doped Graphene Monolayers: A First Principles Study Abstract This study examines the properties of graphene and nitrogen doped graphene by way of first principles spin-polarized Density Functional Theory calculations. Why graphene is so unique comes from

Petta, Jason

212

Chemical Vapor Deposition-Derived Graphene with Electrical Performance of Exfoliated Graphene  

E-Print Network [OSTI]

Chemical Vapor Deposition-Derived Graphene with Electrical Performance of Exfoliated Graphene a scalable method to produce large-area graphene, CVD-grown graphene has heretofore exhibited inferior of CVD-grown graphene in which two important sources of disorder, namely grain boundaries and processing

Hone, James

213

Quantum Rabi oscillations in graphene  

Science Journals Connector (OSTI)

Graphene has been theoretically shown to exhibit anomalous Rabi oscillations (AROs) far from resonance in addition to conventional Rabi oscillations close to resonance (classical light...

Enamullah; Kumar, Vipin; Kumar, Upendra; Setlur, Girish S

2014-01-01T23:59:59.000Z

214

Surprising Quasiparticle Interactions in Graphene  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Surprising Quasiparticle Interactions in Graphene Print Until now, the world's electronics have been dominated by silicon, whose properties, while excellent, significantly limit...

215

Cyclotron Resonance in Bilayer Graphene  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Resonance in Bilayer Graphene PI: Horst Stormer, Department of Physics, Columbia University Supported by NSF (DMR-03-52738 and CHE-0117752), ONR (N000150610138) DOE...

216

Magnetic Edge States in Graphene  

E-Print Network [OSTI]

Magnetic confinement in graphene has been of recent and growing interest because its potential applications in nanotechnology. In particular, the observation of the so called magnetic edge states in graphene has opened the possibility to deepen into the generation of spin currents and its applications in spintronics. We study the magnetic edge states of quasi-particles arising in graphene monolayers due to an inhomogeneous magnetic field of a magnetic barrier in the formalism of the two-dimensional massless Dirac equation. We also show how the solutions of such states in each of both triangular sublattices of the graphene are related through a supersymmetric transformation in the quantum mechanical sense.

Gabriela Murguia

2010-08-29T23:59:59.000Z

217

Multiphonon Raman scattering in graphene  

Science Journals Connector (OSTI)

We report on multiphonon Raman scattering in graphene samples. Higher-order combination modes involving three and four phonons are observed in single-layer, bilayer, and few-layer graphene samples prepared by mechanical exfoliation. The intensity of the higher-order phonon modes (relative to the G peak) is highest in single-layer graphene and decreases with increasing layers. In addition, all higher-order modes are observed to upshift in frequency almost linearly with increasing graphene layers, betraying the underlying interlayer van der Waals interactions.

Rahul Rao; Derek Tishler; Jyoti Katoch; Masa Ishigami

2011-09-12T23:59:59.000Z

218

Graphene in a photonic metamaterial  

Science Journals Connector (OSTI)

We demonstrate a photonic metamaterial that shows extraordinary sensitivity to the presence of a single atomic layer of graphene on its surface. Metamaterial's optical transmission...

Papasimakis, Nikitas; Luo, Zhiqiang; Shen, Ze Xiang; De Angelis, Francesco; Di Fabrizio, Enzo; Nikolaenko, Andrey E; Zheludev, Nikolay I

2010-01-01T23:59:59.000Z

219

Waveguide engineering of graphene's nonlinearity  

E-Print Network [OSTI]

Graphene has recently been shown to possess giant nonlinearity; however, the utility of this nonlinearity is limited due to high losses and small interaction volume. We show that by performing waveguide engineering to graphene's nonlinearity, we are able to dramatically increase the nonlinear parameter and decrease the switching optical power to sub-watt levels. Our design makes use of the hybrid plasmonic waveguide and careful manipulation of graphene's refractive index by tuning its Fermi level. The ability to tailor the nonlinear parameter in graphene based waveguides via the Fermi level provides a paradigm of nonlinear optics devices to be realized.

Ooi, Kelvin J A; Tan, Dawn T H

2014-01-01T23:59:59.000Z

220

Graphene hyperlens for terahertz radiation  

Science Journals Connector (OSTI)

We propose a graphene hyperlens for the terahertz (THz) range. We employ and numerically examine a structured graphene-dielectric multilayered stack that is an analog of a metallic wire medium. As an example of the graphene hyperlens in action, we demonstrate an imaging of two point sources separated by a distance ?0/5. An advantage of such a hyperlens as compared to a metallic one is the tunability of its properties by changing the chemical potential of graphene. We also propose a method to retrieve the hyperbolic dispersion, check the effective medium approximation, and retrieve the effective permittivity tensor.

Andrei Andryieuski; Andrei V. Lavrinenko; Dmitry N. Chigrin

2012-09-27T23:59:59.000Z

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Localized defect modes in graphene  

Science Journals Connector (OSTI)

We study the properties of localized vibrational modes associated with structural defects in a sheet of graphene. For the examples of the Stone-Wales defects, one- and two-atom vacancies, many-atom linear vacancies, and adatoms in a honeycomb lattice, we demonstrate that the local defect modes are characterized by stable oscillations with the frequencies lying outside the linear frequency bands of an ideal graphene. In the frequency spectral density of thermal oscillations, such localized defect modes lead to the additional peaks from the right side of the frequency band of the ideal sheet of graphene, which indicate the presence of defects in the graphene flakes.

Alexander V. Savin and Yuri S. Kivshar

2013-09-11T23:59:59.000Z

222

Graphene/Li-ion battery  

Science Journals Connector (OSTI)

Density function theory calculations were carried out to clarify storage states of Lithium (Li) ions in graphene clusters. The adsorption energy spin polarization charge distribution electronic gap surface curvature and dipole momentum were calculated for each cluster. Li-ion adsorbed graphene doped by one Li atom is spin polarized so there would be different gaps for different spin polarization in electrons. Calculation results demonstrated that a smaller cluster between each two larger clusters is preferable because it could improve grapheneLi-ion batteries; consequently the most proper graphene anode structure has been proposed.

Narjes Kheirabadi; Azizollah Shafiekhani

2012-01-01T23:59:59.000Z

223

Dry-cleaning of graphene  

SciTech Connect (OSTI)

Studies of the structural and electronic properties of graphene in its pristine state are hindered by hydrocarbon contamination on the surfaces. Also, in many applications, contamination reduces the performance of graphene. Contamination is introduced during sample preparation and is adsorbed also directly from air. Here, we report on the development of a simple dry-cleaning method for producing large atomically clean areas in free-standing graphene. The cleanness of graphene is proven using aberration-corrected high-resolution transmission electron microscopy and electron spectroscopy.

Algara-Siller, Gerardo [Central Facility for Electron Microscopy, Group of Electron Microscopy of Materials Science, Ulm University, Albert-Einstein-Allee 11, Ulm 89081 (Germany); Department of Chemistry, Technical University Ilmenau, Weimarer Strasse 25, Ilmenau 98693 (Germany); Lehtinen, Ossi; Kaiser, Ute, E-mail: ute.kaiser@uni-ulm.de [Central Facility for Electron Microscopy, Group of Electron Microscopy of Materials Science, Ulm University, Albert-Einstein-Allee 11, Ulm 89081 (Germany); Turchanin, Andrey [Faculty of Physics, University of Bielefeld, Universittsstr. 25, Bielefeld 33615 (Germany)

2014-04-14T23:59:59.000Z

224

Epitaxial-Graphene/Graphene-Oxide Junction: An Essential Step towards Epitaxial Graphene Electronics  

Science Journals Connector (OSTI)

Graphene-oxide (GO) flakes have been deposited to bridge the gap between two epitaxial-graphene electrodes to produce all-graphene devices. Electrical measurements indicate the presence of Schottky barriers at the graphene/graphene-oxide junctions, as a consequence of the band gap in GO. The barrier height is found to be about 0.7eV, and is reduced after annealing at 180?C, implying that the gap can be tuned by changing the degree of oxidation. A lower limit of the GO mobility was found to be 850??cm2/V?s, rivaling silicon. Insitu local oxidation of patterned epitaxial graphene has been achieved.

Xiaosong Wu; Mike Sprinkle; Xuebin Li; Fan Ming; Claire Berger; Walt A. de Heer

2008-07-07T23:59:59.000Z

225

Graphene Physics L.A. Falkovsky  

E-Print Network [OSTI]

Graphene Physics L.A. Falkovsky Landau Institute for Theoretical Physics #12;outline · electron dispersion in graphene, graphene bilayer and graphite · conductivity in optical region · universal dynamical conductivity of graphene · Kerr effect and reflectivity in magnetic field #12;#12;Novoselov et al (2005)Field

Titov, Anatoly

226

Argonne CNM Highlight: Nanopatterning of Graphene  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nanopatterning of Graphene Nanopatterning of Graphene Hydrogen-passivated graphene Hydrogen passivated graphene imaged and patterned at the atomic scale with STM CNM users from Politecnico di Milano in Italy, working collaboratively with researchers in the Electronic & Magnetic Materials & Devices Group, have demonstrated the reversible and local modification of the electronic properties of graphene by hydrogen passivation and subsequent electron-stimulated hydrogen desorption with a scanning tunneling microscope (STM) tip. Graphene is a nearly ideal two-dimensional conductor consisting of a single sheet of hexagonally packed carbon atoms. The hydrogen passivation modifies graphene's electronic properties, opening a gap in the local density of states. The insulating state is reversed by

227

Inch-Scale High Throughput Metrology of Graphene and Patterned Graphene Oxide  

E-Print Network [OSTI]

Strength of Monolayer Graphene Science 2008 321, 385-388. 5.Novoselov, K. S. The rise of graphene Nature 2007 6 183-191.A. Thermal properties of graphene and nanostructured carbon

Pleskot, Dennis

2013-01-01T23:59:59.000Z

228

Graphene Device Fabrication and Applications in Communication Systems  

E-Print Network [OSTI]

The dark color regions are graphene and the light color isElectrical Characterization Graphene Devices 3.1 ElectricalMeasurement of Back-Gate Graphene Device Graphene is a very

Liu, Guanxiong

2012-01-01T23:59:59.000Z

229

Energy Office Grant Helps the Virgin Islands Environmental Resource Station Install Solar Panels, Improve Efficiency, and Cut Monthly Energy Use Nearly 30% (Fact Sheet), Energy Development in Island Nations, U.S. Virgin Islands (EDIN)  

Broader source: Energy.gov (indexed) [DOE]

Office Grant Helps the Virgin Islands Environmental Office Grant Helps the Virgin Islands Environmental Resource Station Install Solar Panels, Improve Efficiency, and Cut Monthly Energy Use Nearly 30% Organization Virgin Islands Energy Office www.vienergy.org Industry/Sector Government/Nonprofit Deployment Location St. John, U.S. Virgin Islands This project is such a great learning tool, and I am excited about its progress and being able to show students visiting either VIERS or our website the impact of solar energy. -Randy Brown VIERS Administrator The Virgin Islands Environmental Resource Station developed a solar classroom to educate young people in the U.S. Virgin Islands about renewable energy technologies and their energy and environmental impacts. Photo from Don Buchanan, Virgin Islands Energy Office,

230

Husimi Maps in Graphene  

E-Print Network [OSTI]

We present a method for bridging the gap between the Dirac effective field theory and atomistic simulations in graphene based on the Husimi projection, allowing us to depict phenomena in graphene at arbitrary scales. This technique takes the atomistic wavefunction as an input, and produces semiclassical pictures of quasiparticles in the two Dirac valleys. We use the Husimi tech- nique to produce maps of the scattering behavior of boundaries, giving insight into the properties of wavefunctions at energies both close to and far from the Dirac point. Boundary conditions play a significant role to the rise of Fano resonances, which we examine using the Husimi map to deepen our understanding of bond currents near resonance.

Douglas J. Mason; Mario F. Borunda; Eric J. Heller

2012-06-08T23:59:59.000Z

231

Ultrafast Photoluminescence from Graphene  

Science Journals Connector (OSTI)

Since graphene has no band gap, photoluminescence is not expected from relaxed charge carriers. We have, however, observed significant light emission from graphene under excitation by ultrashort (30-fs) laser pulses. Light emission was found to occur across the visible spectral range (1.73.5eV), with emitted photon energies exceeding that of the excitation laser (1.5eV). The emission exhibits a nonlinear dependence on the laser fluence. In two-pulse correlation measurements, a dominant relaxation time of tens of femtoseconds is observed. A two-temperature model describing the electrons and their interaction with strongly coupled optical phonons can account for the experimental observations.

Chun Hung Lui (???); Kin Fai Mak; Jie Shan; Tony F. Heinz

2010-09-16T23:59:59.000Z

232

DOE - Office of Legacy Management -- Amchitka Island Test Center - AK 01  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Amchitka Island Test Center - AK 01 Amchitka Island Test Center - AK 01 FUSRAP Considered Sites Site: Amchitka Island Test Center (AK.01) Designated Name: Alternate Name: Location: Evaluation Year: Site Operations: Site Disposition: Radioactive Materials Handled: Primary Radioactive Materials Handled: Radiological Survey(s): Site Status: Also see Amchitka Island Test Center Documents Related to Amchitka Island Test Center Draft Long-Term Surveillance Plan for the Amchitka Island, Alaska, Project Site (September 2013) An Assessment of the Reported Leakage of Anthropogenic Radionuclides From the Underground Nuclear Test Sites at Amchitka Island, Alaska, USA to the Surface Environment. Conceptual Site Models as a Tool in Evaluation Ecological health; The Case of the Department of Energys Amchitka Island Nuclear Test Site.

233

7 - Raman spectroscopy of graphene  

Science Journals Connector (OSTI)

Abstract: The principles of Raman scattering and the properties of phonons and electrons in graphene are reviewed. The focus is on Raman spectroscopy of mono- and bilayer graphene, particularly perturbations that have a significant influence on the Raman spectra. The distinct behaviour of Raman modes of different orders is discussed.

M. Hulman

2014-01-01T23:59:59.000Z

234

Dynamical screening in bilayer graphene  

Science Journals Connector (OSTI)

We calculate one-loop polarization in bilayer graphene in the four-band approximation for arbitrary values of frequency, momentum, and doping. At low and high energy our results reduce to the polarization functions calculated in the two-band approximation and in the case of single-layer graphene, respectively. The special cases of static screening and plasmon modes are analyzed.

O. V. Gamayun

2011-08-22T23:59:59.000Z

235

Quantum Field Theory in Graphene  

E-Print Network [OSTI]

This is a short non-technical introduction to applications of the Quantum Field Theory methods to graphene. We derive the Dirac model from the tight binding model and describe calculations of the polarization operator (conductivity). Later on, we use this quantity to describe the Quantum Hall Effect, light absorption by graphene, the Faraday effect, and the Casimir interaction.

I. V. Fialkovsky; D. V. Vassilevich

2011-11-13T23:59:59.000Z

236

AMCHITICA ISLAND, ALASKA  

Office of Legacy Management (LM)

Environment o Environment o f AMCHITICA ISLAND, ALASKA hlelvin L. hlerritt Sandia Laboratories Albuquerque, New Mexico Editors R. Glen Fuller Battelle Colu~nbus Laboratories Columbus, Ohio Prepared for Division of Military Application Energy Research and Development Administration Published by Technical Infor~nation Center Energy Research and Development Administration Library of Congress Cataloging in Pt~blication Data hlain entry under title: The Environment of Amchitka Island, Alaska "TlD-26712." Bibliography: p. Includrs indcx. 1. Eeology-Alarka-Amchirka Island. 2. Underground nuclear explorions-lIsland. 3. Cannikin Projcct. I. hlerritt, hlelvin Leroy, 1921- 11. Fuiler, Rtxeben Glen, 1910- 111. United Stater. Energy Research and Development

237

Coulomb impurity in graphene  

E-Print Network [OSTI]

We consider the problem of screening of an electrically charged impurity in a clean graphene sheet. When electron-electron interactions are neglected, the screening charge has a sign opposite to that of the impurity, and is localized near the impurity. Interactions between electrons smear out the induced charge density to give a large-distance tail that follows approximately, but not exactly, an r^{-2} behavior and with a sign which is the same as that of the impurity.

Rudro R. Biswas; Subir Sachdev; Dam T. Son

2007-06-26T23:59:59.000Z

238

Supercurrent in superconducting graphene  

Science Journals Connector (OSTI)

The problem of supercurrent in superconducting graphene is revisited and the supercurrent is calculated within the mean-field model employing the two-component wave functions on a honeycomb lattice with pairing between different valleys in the Brillouin zone. We show that the supercurrent within the linear approximation in the order-parameter-phase gradient is always finite even if the doping level is exactly zero.

N. B. Kopnin and E. B. Sonin

2010-07-13T23:59:59.000Z

239

Turbulent flow in graphene  

E-Print Network [OSTI]

We demonstrate the possibility of a turbulent flow of electrons in graphene in the hydrodynamic region, by calculating the corresponding turbulent probability density function. This is used to calculate the contribution of the turbulent flow to the conductivity within a quantum Boltzmann approach. The dependence of the conductivity on the system parameters arising from the turbulent flow is very different from that due to scattering.

Kumar S. Gupta; Siddhartha Sen

2009-11-03T23:59:59.000Z

240

Qualifying RPS State Export Markets (Rhode Island) | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Rhode Island) Rhode Island) Qualifying RPS State Export Markets (Rhode Island) < Back Eligibility Developer Savings Category Alternative Fuel Vehicles Hydrogen & Fuel Cells Buying & Making Electricity Water Home Weatherization Solar Wind Program Info State Rhode Island Program Type Renewables Portfolio Standards and Goals This entry lists the states with Renewable Portfolio Standard (RPS) policies that accept generation located in Rhode Island as eligible sources towards their RPS targets or goals. For specific information with regard to eligible technologies or other restrictions which may vary by state, see the RPS policy entries for the individual states, shown below in the Authority listings. Typically energy must be delivered to an in-state utility or Load Serving Entity, and often only a portion of compliance

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Qualifying RPS Market States (Prince Edward Island, Canada) | Department of  

Broader source: Energy.gov (indexed) [DOE]

Prince Edward Island, Canada) Prince Edward Island, Canada) Qualifying RPS Market States (Prince Edward Island, Canada) < Back Eligibility Developer Savings Category Alternative Fuel Vehicles Hydrogen & Fuel Cells Buying & Making Electricity Water Home Weatherization Solar Wind Program Info State Prince Edward Island Program Type Renewables Portfolio Standards and Goals This entry lists the states with RPS policies that accept generation located in Prince Edward Island, Canada as eligible sources towards their Renewable Portfolio Standard targets or goals. For specific information with regard to eligible technologies or other restrictions which may vary by state, see the RPS policy entries for the individual states, shown below in the Authority listings. Typically energy must be delivered to an

242

Heat Island Research at the University of Athens  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Heat Island Research at the University of Athens Heat Island Research at the University of Athens Speaker(s): Mattheos Santamouris Date: June 4, 2008 - 12:00pm Location: 90-3122 Seminar Host/Point of Contact: Hashem Akbari Athens, as many other metropolitan areas, is experiencing a severe summer heat island. We will present measurements of urban canyon heat islands in Athens and discuss the effects on building energy use, urban environment, and air quality. Appropriate heat-island mitigation technologies include use of cool materials for urban surfaces (roofs and pavements) and shade trees. Advances in development of cool roofing and paving materials including traditional cool surfaces (white and light-colored materials), near-infrared cool colored materials, and experimental highly reflecting thermochromic coatings will be discussed. Finally, we will discuss the

243

Graphene Device Fabrication and Applications in Communication Systems  

E-Print Network [OSTI]

of Graphene FET (GFET) is biased with quiet battery andof Graphene FET (GFET) is biased with quiet battery and

Liu, Guanxiong

2012-01-01T23:59:59.000Z

244

Phonon dispersion in graphene  

Science Journals Connector (OSTI)

Taking into account constraints imposed by the lattice symmetry we calculate analytically [1] the phonon dispersion for graphene with interactions between first and second neighbors. We find that the out?of?plane (bending) modes are not coupled with in?plane modes and described only with two force constants one of which is determined by the corresponding Raman frequency and another by the smallest elastic constant C44. In contrast to calculations by Saito et al we find the linear dispersion of the bending (out?of?plane) mode around the ? point with a small but finite sound velocity =1.57 km/s. The sound velocity of this mode is very sensitive to small variations of the force constants. The sound velocities of in?plane modes are = 20.3 km/s and =13.1 km/s. Because of the lack of information for graphene we compare the present theory with experiments on graphite. The low phonon frequencies in the critical points turn out less than their values in graphite since the atoms in graphene are more free to move in the out?of?plane direction in comparison with graphite. Accuracy of the comparison can be estimated using the value of the observed splitting of the ZA and ZO' modes in graphite which is around 130 1/cm. [1] L.A. Falkovsky cond?mat/0702409.

Leonid A. Falkovsky

2008-01-01T23:59:59.000Z

245

RKKY coupling in graphene  

Science Journals Connector (OSTI)

We study the carrier-mediated exchange interaction, the so-called Ruderman-Kittel-Kasuya-Yoshida (RKKY) coupling, between two magnetic impurity moments in graphene using exact diagonalization on the honeycomb lattice. By using the tight-binding nearest-neighbor band structure of graphene we also avoid the use of a momentum cutoff which plagues perturbative results in the Dirac continuum model formulation. We extract both the short and long impurity-impurity distance behavior and show on a qualitative agreement with earlier perturbative results in the long-distance limit but also report on a few new findings. In the bulk the RKKY coupling is proportional to 1/|R|3 and displays [1+cos(2kD?R)] -type oscillations. A-A sublattice coupling is always ferromagnetic whereas A-B subattice coupling is always antiferromagnetic and three times as large. We also study the effect of edges in zigzag graphene nanoribbons (ZGNRs). We find that for impurities on the edge the RKKY coupling decays exponentially because of the localized zero-energy edge states and we also conclude that a nonperturbative treatment is essential for these edge impurities. For impurities inside a ZGNR the bulk characteristics are quickly regained.

Annica M. Black-Schaffer

2010-05-11T23:59:59.000Z

246

Inch-Scale High Throughput Metrology of Graphene and Patterned Graphene Oxide.  

E-Print Network [OSTI]

??Abstract Inch-Scale High Throughput Metrology of Graphene and Patterned Graphene Oxide by Dennis Pleskot Master of Science, Graduate Program in Materials Science and Engineering University (more)

Pleskot, Dennis

2013-01-01T23:59:59.000Z

247

Graphene electron cannon: High-current edge emission from aligned graphene sheets  

SciTech Connect (OSTI)

High-current field emitters are made by graphene paper consist of aligned graphene sheets. Field emission luminance pattern shows that their electron beams can be controlled by rolling the graphene paper from sheet to cylinder. These specific electron beams would be useful to vacuum devices and electron beam lithograph. To get high-current emission, the graphene paper is rolled to array and form graphene cannon. Due to aligned emission array, graphene cannon have high emission current. Besides high emission current, the graphene cannon is also tolerable with excellent emission stability. With good field emission properties, these aligned graphene emitters bring application insight.

Liu, Jianlong; Li, Nannan; Guo, Jing; Fang, Yong; Deng, Jiang [National Key Laboratory of Science and Technology on Vacuum Electronics, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054 (China); Zeng, Baoqing, E-mail: bqzeng@uestc.edu.cn [National Key Laboratory of Science and Technology on Vacuum Electronics, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054 (China); State Key Laboratory of Electronic Thin Films and Integrated Devices Zhongshan Lab, Department of Electronic Engineering, University of Electronic Science and Technology of China Zhongshan Institute, Zhongshan 528402 (China); Wang, Wenzhong; Li, Jiangnan; Hao, Chenchun [School of Science, Minzu University of China, Beijing 100081 (China)

2014-01-13T23:59:59.000Z

248

Controllable N-Doping of Graphene Beidou Guo,,  

E-Print Network [OSTI]

Controllable N-Doping of Graphene Beidou Guo,, Qian Liu, Erdan Chen, Hewei Zhu, Liang Fang in graphene are central to many electronic applications of graphene. Here we report N-doped graphene obtained by NH3 annealing after N+ -ion irradiation of graphene samples. First, the evolution of the graphene

Gong, Jian Ru

249

DOE - Office of Legacy Management -- Rock Island Arsenal - IL 09  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Rock Island Arsenal - IL 09 Rock Island Arsenal - IL 09 FUSRAP Considered Sites Site: ROCK ISLAND ARSENAL ( IL.09 ) Eliminated from consideration under FUSRAP - Referred to DOD Designated Name: Not Designated Alternate Name: None Location: Rock Island , Illinois IL.09-1 Evaluation Year: 1987 IL.09-2 Site Operations: Site located on a DOD facility and operated under AEC control. Exact nature or time period of operations not clear. No indication that radioactive materials were involved. Contract work with Albuquerque Operations office performed. IL.09-1 IL.09-2 Site Disposition: Eliminated - No Authority - Referred to DOD IL.09-2 Radioactive Materials Handled: None Indicated IL.09-2 Primary Radioactive Materials Handled: None Indicated Radiological Survey(s): None Indicated

250

Long Island Power Authority Solar Project | Open Energy Information  

Open Energy Info (EERE)

Project Project Jump to: navigation, search Name Long Island Power Authority Solar Project Facility Long Island Power Authority Solar Project Sector Solar Facility Type Roof-mount Owner EnXco Developer EnXco Energy Purchaser Long Island Power Authority Location Long Island, New York Coordinates 40.8168025°, -73.0661493° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":40.8168025,"lon":-73.0661493,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

251

Rhode Island Offshore Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Island Offshore Wind Farm Island Offshore Wind Farm Jump to: navigation, search Name Rhode Island Offshore Wind Farm Facility Rhode Island Offshore Wind Farm Sector Wind energy Facility Type Offshore Wind Facility Status Proposed Developer Deepwater Wind Location Offshore from Sakonnet RI Coordinates 40.96°, -71.44° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":40.96,"lon":-71.44,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

252

Direct comparison of graphene devices before and after transfer to different substrates  

SciTech Connect (OSTI)

The entire graphene field-effect-transistor devices first fabricated on SiO{sub 2}/Si are peeled from the surface and placed on a different wafer. Both longitudinal and transverse resistivity measurements of the devices before and after the transfer are measured to calculate the mobility for a direct comparison. After transferred to different SiO{sub 2}/Si wafers, the mobility, generally, is comparable, and the defect density does not show any significant increase, which indicates the degradation due to the transfer process itself is minimal. The same method can be applied to transfer graphene devices to any arbitrary substrates (e.g., SrTiO{sub 3} or STO). The transfer method developed here not only eliminates the need to locate single-layer graphene on non-SiO{sub 2}/Si substrates for patterning but also provides a convenient way to study the effects of various substrates on graphene electronic properties.

Sachs, Raymond; Lin, Zhisheng; Odenthal, Patrick; Kawakami, Roland; Shi, Jing [Department of Physics and Astronomy, University of California, Riverside, California 92521 (United States)

2014-01-20T23:59:59.000Z

253

Clean Cities: Coalition Locations  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Locations Locations Clean Cities coalitions are primarily located in major metropolitan areas throughout the United States. Select the dots on the map for information about individual coalitions. See also the list of coalitions by designation date. United States map showing Clean Cities Coalition locations. Philadelphia State of Delaware Capitol Clean Cities of Connecticut Connecticut Southwestern Area New Haven Norwich Red River Valley (Grand Forks, Winnipeg, Manitoba, Canada) Silicon Valley (San Jose) East Bay (Oakland) San Francisco Sacramento Granite State State of Vermont Northeast Ohio Clean Transportation (Cleveland) Detroit Clean Communities of Western New York (Buffalo) Central New York (Syracuse) Capital District (Albany) Empire Clean Cities State of Maryland Washington DC Metropolitan South Shore Western Riverside County Southern California Association of Governments (SCAG) Atlanta Alabama Denver Philadelphia State of Delaware Las Vegas Washington DC Metropolitan Massachusetts Clean Cities Lone Star Clean Fuels Alliance (Austin) Southeast Florida Chicago Land of Enchantment Wisconsin-Southeast Area Southern Colorado Clean Cities Coalition Long Beach Antelope Valley Utah Clean Cities State of Maryland Kentucky Clean Cities Partnership Coalition Rogue Valley State of West Virginia San Joaquin Valley San Francisco Columbia-Willamette St. Louis Central New York (Syracuse) Dallas/Ft. Worth Honolulu Central Arkansas Pittsburgh Southern California Association of Governments (SCAG) Los Angeles Coachella Valley Region Northern Colorado Central Oklahoma (Oklahoma City) Virginia Clean Cities Coalition San Diego Regional Clean Cities Coalition Greater Long Island Maine Clean Communities Tulsa Valley of the Sun (Phoenix) Western Riverside County New Jersey Genesee Region (Rochester) Western Washington Clean Cities (Seattle) Ocean State Connecticut Connecticut2 Kansas City Regional Coalition Greater Indiana Clean Cities Coalition Capital District (Albany) Tucson Central Florida Clean Cities Coalition Alamo Area (San Antonio) Greater Baton Rouge Clean Cities Coalition Triangle (Raleigh, Durham, Chapel Hill) Twin Cities Clean Fuels Ohio Yellowstone-Teton Clean Energy Coalition Greater Lansing Palmetto State Houston-Galveston Middle Tennessee East Tennessee Clean Fuels Coalition Centralina Clean Fuels Coalition State of Iowa Treasure Valley Central Coast Southeast Louisiana Clean Fuels Partnership Land of Sky Coalition

254

Clean Cities: Coalition Locations  

Alternative Fuels and Advanced Vehicles Data Center [Office of Energy Efficiency and Renewable Energy (EERE)]

Locations Locations Clean Cities coalitions are primarily located in major metropolitan areas throughout the United States. Select the dots on the map for information about individual coalitions. See also the list of coalitions by designation date. United States map showing Clean Cities Coalition locations. Philadelphia State of Delaware Capitol Clean Cities of Connecticut Connecticut Southwestern Area New Haven Norwich Red River Valley (Grand Forks, Winnipeg, Manitoba, Canada) Silicon Valley (San Jose) East Bay (Oakland) San Francisco Sacramento Granite State State of Vermont Northeast Ohio Clean Transportation (Cleveland) Detroit Clean Communities of Western New York (Buffalo) Central New York (Syracuse) Capital District (Albany) Empire Clean Cities State of Maryland Washington DC Metropolitan South Shore Western Riverside County Southern California Association of Governments (SCAG) Atlanta Alabama Denver Philadelphia State of Delaware Las Vegas Washington DC Metropolitan Massachusetts Clean Cities Lone Star Clean Fuels Alliance (Austin) Southeast Florida Chicago Land of Enchantment Wisconsin-Southeast Area Southern Colorado Clean Cities Coalition Long Beach Antelope Valley Utah Clean Cities State of Maryland Kentucky Clean Cities Partnership Coalition Rogue Valley State of West Virginia San Joaquin Valley San Francisco Columbia-Willamette St. Louis Central New York (Syracuse) Dallas/Ft. Worth Honolulu Central Arkansas Pittsburgh Southern California Association of Governments (SCAG) Los Angeles Coachella Valley Region Northern Colorado Central Oklahoma (Oklahoma City) Virginia Clean Cities Coalition San Diego Regional Clean Cities Coalition Greater Long Island Maine Clean Communities Tulsa Valley of the Sun (Phoenix) Western Riverside County New Jersey Genesee Region (Rochester) Western Washington Clean Cities (Seattle) Ocean State Connecticut Connecticut2 Kansas City Regional Coalition Greater Indiana Clean Cities Coalition Capital District (Albany) Tucson Central Florida Clean Cities Coalition Alamo Area (San Antonio) Greater Baton Rouge Clean Cities Coalition Triangle (Raleigh, Durham, Chapel Hill) Twin Cities Clean Fuels Ohio Yellowstone-Teton Clean Energy Coalition Greater Lansing Palmetto State Houston-Galveston Middle Tennessee East Tennessee Clean Fuels Coalition Centralina Clean Fuels Coalition State of Iowa Treasure Valley Central Coast Southeast Louisiana Clean Fuels Partnership Land of Sky Coalition

255

Tailoring graphene with metals on top  

Science Journals Connector (OSTI)

We study the effects of metallic doping on the electronic properties of graphene using density functional theory in the local density approximation in the presence of a local charging energy. The electronic properties are sensitive to whether graphene is doped with alkali or transition metals. We estimate the charge transfer from a single layer of potassium on top of graphene in terms of the local charging energy of the graphene sheet. The coating of graphene with a nonmagnetic layer of palladium, on the other hand, can lead to a magnetic instability in coated graphene due to the hybridization between the transition metal and the carbon orbitals.

B. Uchoa; C.-Y. Lin; A. H. Castro Neto

2008-01-17T23:59:59.000Z

256

Directional excitation of graphene surface plasmons  

E-Print Network [OSTI]

We propose a scheme to directionally couple light into graphene plasmons by placing a graphene sheet on a magneto-optical substrate. When a magnetic field is applied parallel to the surface, the graphene plasmon dispersion relation becomes asymmetric in the forward and backward directions. It is possible to achieve unidirectional excitation of graphene plasmons with normally incident illumination by applying a grating to the substrate. The directionality can be actively controlled by electrically gating the graphene, or by varying the magnetic bias. This scheme may have applications in graphene-based opto-electronics and sensing.

Liu, Fangli; Chong, Y D

2014-01-01T23:59:59.000Z

257

Shot Noise in Ballistic Graphene  

Science Journals Connector (OSTI)

We have investigated shot noise in graphene field effect devices in the temperature range of 4.230K at low frequency (f=600850??MHz). We find that for our graphene samples with a large width over length ratio W/L, the Fano factor F reaches a maximum F?1/3 at the Dirac point and that it decreases strongly with increasing charge density. For smaller W/L, the Fano factor at Dirac point is significantly lower. Our results are in good agreement with the theory describing that transport at the Dirac point in clean graphene arises from evanescent electronic states.

R. Danneau; F. Wu; M. F. Craciun; S. Russo; M. Y. Tomi; J. Salmilehto; A. F. Morpurgo; P. J. Hakonen

2008-05-13T23:59:59.000Z

258

Smart antennas based on graphene  

SciTech Connect (OSTI)

We report two configurations of smart graphene antennas, in which either the radiation pattern of the antenna or the backscattering of the periodic metallic arrays is controlled by DC biases that induce metal-insulator reversible transitions of graphene monolayers. Such a transition from a high surface resistance (no bias) to a low surface resistance state (finite bias voltage) causes the radiation pattern of metallic antennas backed with graphene to change dramatically, from omnidirectional to broadside. Moreover, reflectarrays enhance the backscattered field due to the same metal-dielectric transition.

Aldrigo, Martino; Dragoman, Mircea, E-mail: mircea.dragoman@imt.ro [National Institute for Research and Development in Microtechnology (IMT), P.O. Box 38-160, 023573 Bucharest (Romania); Dragoman, Daniela [Physics Faculty, University of Bucharest, P.O. Box MG-11, 077125 Bucharest (Romania)

2014-09-21T23:59:59.000Z

259

Magneto-transport properties of gapped graphene  

Science Journals Connector (OSTI)

Based on the Kubo formula, we have studied the electron transport properties of a gapped graphene in the presence of a strong magnetic field. By solving the Dirac equation, we find that the Landau level spectra in two valleys differ from each other in that the n = 0 level in the K valley is located at top of the valence band, whereas it is at the bottom of the conduction band in the K' valley. Thus, in an individual valley, the symmetry between conduction and valence bands is broken by the presence of a magnetic field. By using the self-consistent Born approximation to treat the long range potential scattering, we formulate the diagonal and the Hall conductivities in terms of the Green function. To perform the numerical calculation, we find that a large bandgap can suppress the quantum Hall effect, owing to the enhancement of the bandgap squeezing the spacing between the low-lying Landau levels. On the other hand, if the bandgap is not very large, the odd integer quantum Hall effect experimentally, observed in the gapless graphene, remains in the gapped one. However, such a result does not indicate the half integer quantum Hall effect in an individual valley of the gapped graphene. This is because the heights of the Hall plateaux in either valley can be continuously tuned by the variation of the bandgap. More interestingly, we find that the height of the diagonal conductivity peak corresponding to the n = 0 Landau level is independent of the bandgap if the scattering is not very strong. In the weak scattering limit, we demonstrate analytically that such a peak takes a universal value e2/(h?), regardless of the bandgap.

Liwei Jiang; Yisong Zheng; Haidong Li; Honghai Shen

2010-01-01T23:59:59.000Z

260

Phonon dispersion in graphene  

E-Print Network [OSTI]

Taking into account the constraints imposed by the lattice symmetry, the phonon dispersion is calculated for graphene with interactions between the first and second nearest neighbors in the framework of the Born-von Karman model. Analytical expressions are obtained for the out-of-plane (bending) modes determined only by two force constants as well as for the in-plane modes with four force constants. Values of the force constants are found in fitting to elastic constants and Raman frequencies observed in graphite.

L. A. Falkovsky

2007-02-17T23:59:59.000Z

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Diamagnetism in disordered graphene  

Science Journals Connector (OSTI)

The orbital magnetism is studied in graphene monolayer within the effective-mass approximation. In models of short-range and long-range disorders, the magnetization is calculated with self-consistent Born approximation. In the zero-field limit, the susceptibility becomes highly diamagnetic around zero energy, while it has a long tail proportional to the inverse of the Fermi energy. We demonstrated how the magnetic oscillation vanishes and converges to the susceptibility, in going from a strong-field regime to a weak-field regime. The behavior at zero energy is shown to be highly singular.

Mikito Koshino and Tsuneya Ando

2007-06-29T23:59:59.000Z

262

Magnetic impurities in graphene  

Science Journals Connector (OSTI)

We used a quantum Monte Carlo method to study the magnetic impurity adatoms on graphene. We found that by tuning the chemical potential we could switch the values of the impurity local magnet moment between relatively large and small values. Our computations of the impurity spectral density found its behavior to differ significantly from that of an impurity in a normal metal and our computations of the charge-charge and spin-spin correlations between the impurity and the conduction-band electrons found them to be strongly suppressed. In general, our results are consistent with those from poor mans scaling and numerical renormalization group methods.

F. M. Hu; Tianxing Ma; Hai-Qing Lin; J. E. Gubernatis

2011-08-03T23:59:59.000Z

263

Hallmark of Perfect Graphene  

Science Journals Connector (OSTI)

Using first-principles calculations we show that the adsorption of atomic hydrogen on graphene opens a substantial gap in the electronic density of states in which lies a spin-polarized gap state. This spin is quenched by the presence of a rotated C-C bond (a Stone-Wales defect) adjacent to or distant from the H atom. We explain these findings and discuss the implications for nanotubes and magnetic nanographene. Furthermore, we demonstrate that the combined effect of high curvature and a Stone-Wales defect makes H2 chemisorption close to being thermodynamically favorable.

Elizabeth J. Duplock; Matthias Scheffler; Philip J. D. Lindan

2004-06-03T23:59:59.000Z

264

Comparison of the Catalytic Oxidation Reaction on Graphene Oxide and Reduced Graphene Oxide  

E-Print Network [OSTI]

Comparison of the Catalytic Oxidation Reaction on Graphene Oxide and Reduced Graphene Oxide Laboratory (PAL), Pohang 790-784, Republic of Korea ABSTRACT: The capacities of graphene oxide (GO) and reduced graphene oxide (rGO) films grown on silicon substrate to cause the aniline to azobenzene oxidation

Kim, Sehun

265

Variable temperature Raman microscopy as a nanometrology tool for graphene layers and graphene-based devices  

E-Print Network [OSTI]

Variable temperature Raman microscopy as a nanometrology tool for graphene layers and graphene; accepted 24 July 2007; published online 15 August 2007 Raman microscopy of graphene was carried out over-band frequencies extracted from Raman spectra of the single-layer graphene are - 1.6±0.2 10-2 cm-1 /K and - 3

266

Nanoscale tunable reduction of graphene oxide for graphene electronics , D. Wang2*  

E-Print Network [OSTI]

Nanoscale tunable reduction of graphene oxide for graphene electronics Z. Wei1* , D. Wang2* , S contributed equally to this work. paul.sheehan@nrl.navy.mil elisa.riedo@physics.gatech.edu Graphene is now in graphene oxide (GO) has risen for producing large-scale flexible conductors and for its potential to open

267

Electrostatic transfer of epitaxial graphene to glass.  

SciTech Connect (OSTI)

We report on a scalable electrostatic process to transfer epitaxial graphene to arbitrary glass substrates, including Pyrex and Zerodur. This transfer process could enable wafer-level integration of graphene with structured and electronically-active substrates such as MEMS and CMOS. We will describe the electrostatic transfer method and will compare the properties of the transferred graphene with nominally-equivalent 'as-grown' epitaxial graphene on SiC. The electronic properties of the graphene will be measured using magnetoresistive, four-probe, and graphene field effect transistor geometries [1]. To begin, high-quality epitaxial graphene (mobility 14,000 cm2/Vs and domains >100 {micro}m2) is grown on SiC in an argon-mediated environment [2,3]. The electrostatic transfer then takes place through the application of a large electric field between the donor graphene sample (anode) and the heated acceptor glass substrate (cathode). Using this electrostatic technique, both patterned few-layer graphene from SiC(000-1) and chip-scale monolayer graphene from SiC(0001) are transferred to Pyrex and Zerodur substrates. Subsequent examination of the transferred graphene by Raman spectroscopy confirms that the graphene can be transferred without inducing defects. Furthermore, the strain inherent in epitaxial graphene on SiC(0001) is found to be partially relaxed after the transfer to the glass substrates.

Ohta, Taisuke; Pan, Wei; Howell, Stephen Wayne; Biedermann, Laura Butler; Beechem Iii, Thomas Edwin; Ross, Anthony Joseph, III

2010-12-01T23:59:59.000Z

268

Surface functionalization of graphene devices  

E-Print Network [OSTI]

Graphene, a zero-gap semiconductor with massless charge carriers, is emerging as an amazing material for future electronics, due to its outstanding electrical and mechanical performances. However, the lack of a bandgap ...

Zhang, Xu, S.M. Massachusetts Institute of Technology

2012-01-01T23:59:59.000Z

269

Doping Graphene with Metal Contacts  

Science Journals Connector (OSTI)

Making devices with graphene necessarily involves making contacts with metals. We use density functional theory to study how graphene is doped by adsorption on metal substrates and find that weak bonding on Al, Ag, Cu, Au, and Pt, while preserving its unique electronic structure, can still shift the Fermi level with respect to the conical point by ?0.5??eV. At equilibrium separations, the crossover from p-type to n-type doping occurs for a metal work function of ?5.4??eV, a value much larger than the graphene work function of 4.5eV. The numerical results for the Fermi level shift in graphene are described very well by a simple analytical model which characterizes the metal solely in terms of its work function, greatly extending their applicability.

G. Giovannetti; P. A. Khomyakov; G. Brocks; V. M. Karpan; J. van den Brink; P. J. Kelly

2008-07-10T23:59:59.000Z

270

Chiral Gauge Theory for Graphene  

E-Print Network [OSTI]

We construct a chiral gauge theory to describe fractionalization of fermions in graphene. Thereby we extend a recently proposed model, which relies on vortex formation. Our chiral gauge fields provide dynamics for the vortices and also couple to the fermions.

R. Jackiw; S. -Y. Pi

2007-01-30T23:59:59.000Z

271

Thermal properties of fluorinated graphene  

Science Journals Connector (OSTI)

Large-scale atomistic simulations using the reactive force field approach are implemented to investigate the thermomechanical properties of fluorinated graphene (FG). A set of parameters for the reactive force field potential optimized to reproduce key quantum mechanical properties of relevant carbon-fluorine cluster systems are presented. Molecular dynamics simulations are used to investigate the thermal rippling behavior of FG and its mechanical properties and compare them with graphene, graphane and a sheet of boron nitride. The mean square value of the height fluctuations ?h2? and the height-height correlation function H(q) for different system sizes and temperatures show that FG is an unrippled system in contrast to the thermal rippling behavior of graphene. The effective Young's modulus of a flake of fluorinated graphene is obtained to be 273 N/m and 250 N/m for a flake of FG under uniaxial strain along armchair and zigzag directions, respectively.

Sandeep Kumar Singh; S. Goverapet Srinivasan; M. Neek-Amal; S. Costamagna; Adri C. T. van Duin; F. M. Peeters

2013-03-29T23:59:59.000Z

272

Ideal strength of doped graphene  

Science Journals Connector (OSTI)

While the mechanical distortions change the electronic properties of graphene significantly, the effects of electronic manipulation on its mechanical properties have not been known. Using first-principles calculation methods, we show that when graphene expands isotropically under equibiaxial strain, both the electron and hole doping can maintain or improve its ideal strength slightly and enhance the critical breaking strain dramatically. Contrary to the isotropic expansions, the electron doping decreases the ideal strength as well as critical strain of uniaxially strained graphene while the hole doping increases both. Distinct failure mechanisms depending on type of strains are shown to be origins of the different doping induced mechanical stabilities. Our findings may resolve a contradiction between recent experimental and theoretical results on the strength of graphene.

S. J. Woo and Young-Woo Son

2013-02-13T23:59:59.000Z

273

Grain boundary loops in graphene  

Science Journals Connector (OSTI)

Topological defects can affect the physical properties of graphene in unexpected ways. Harnessing their influence may lead to enhanced control of both material strength and electrical properties. Here we present a class of topological defects in graphene composed of a rotating sequence of dislocations that close on themselves, forming grain boundary loops that either conserve the number of atoms in the hexagonal lattice or accommodate vacancy or interstitial reconstruction, while leaving no unsatisfied bonds. One grain boundary loop is observed as a flower pattern in scanning tunneling microscopy studies of epitaxial graphene grown on SiC(0001). We show that the flower defect has the lowest energy per dislocation core of any known topological defect in graphene, providing a natural explanation for its growth via the coalescence of mobile dislocations.

Eric Cockayne; Gregory M. Rutter; Nathan P. Guisinger; Jason N. Crain; Phillip N. First; Joseph A. Stroscio

2011-05-12T23:59:59.000Z

274

Dynamic RKKY interaction in graphene  

Science Journals Connector (OSTI)

The growing interest in carbon-based spintronics has stimulated a number of recent theoretical studies on the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction in graphene, based on which the energetically favorable alignment between magnetic moments embedded in this material can be calculated. The general consensus is that the strength of the RKKY interaction in undoped graphene decays as 1/D3 or faster, where D is the separation between magnetic moments. Such an unusually fast decay for a two-dimensional system suggests that the RKKY interaction may be too short ranged to be experimentally observed in graphene. Here we show in a mathematically transparent form that a far more long ranged interaction arises when the magnetic moments are taken out of their equilibrium positions and set in motion. We not only show that this dynamic version of the RKKY interaction in graphene decays far more slowly but also propose how it can be observed with currently available experimental methods.

S. R. Power; F. S. M. Guimares; A. T. Costa; R. B. Muniz; M. S. Ferreira

2012-05-07T23:59:59.000Z

275

Chiral Gauge Theory for Graphene  

Science Journals Connector (OSTI)

We construct a chiral gauge theory to describe fractionalization of fermions in graphene. Thereby we extend a recently proposed model, which relies on vortex formation. Our chiral gauge fields provide dynamics for the vortices and also couple to the fermions.

R. Jackiw and S.-Y. Pi

2007-06-26T23:59:59.000Z

276

The electronic properties of graphene  

Science Journals Connector (OSTI)

This article reviews the basic theoretical aspects of graphene, a one-atom-thick allotrope of carbon, with unusual two-dimensional Dirac-like electronic excitations. The Dirac electrons can be controlled by application of external electric and magnetic fields, or by altering sample geometry and/or topology. The Dirac electrons behave in unusual ways in tunneling, confinement, and the integer quantum Hall effect. The electronic properties of graphene stacks are discussed and vary with stacking order and number of layers. Edge (surface) states in graphene depend on the edge termination (zigzag or armchair) and affect the physical properties of nanoribbons. Different types of disorder modify the Dirac equation leading to unusual spectroscopic and transport properties. The effects of electron-electron and electron-phonon interactions in single layer and multilayer graphene are also presented.

A. H. Castro Neto; F. Guinea; N. M. R. Peres; K. S. Novoselov; A. K. Geim

2009-01-14T23:59:59.000Z

277

Four Dimensional Graphene  

E-Print Network [OSTI]

Mimicking pristine 2D graphene, we revisit the BBTW model for 4D lattice QCD given in ref.[5] by using the hidden SU(5) symmetry of the 4D hyperdiamond lattice H_4. We first study the link between the H_4 and SU(5); then we refine the BBTW 4D lattice action by using the weight vectors \\lambda_1, \\lambda_2, \\lambda_3, \\lambda_4, \\lambda_5 of the 5-dimensional representation of SU(5) satisfying {\\Sigma}_i\\lambda_i=0. After that we study explicitly the solutions of the zeros of the Dirac operator D in terms of the SU(5) simple roots \\alpha_1, \\alpha_2, \\alpha_3, \\alpha_4 generating H_4; and its fundamental weights \\omega_1, \\omega_2, \\omega_3, \\omega_4 which generate the reciprocal lattice H_4^\\ast. It is shown, amongst others, that these zeros live at the sites of H_4^\\ast; and the continuous limit D is given by ((id\\surd5)/2) \\gamma^\\muk_\\mu with d, \\gamma^\\mu and k_\\mu standing respectively for the lattice parameter of H_4, the usual 4 Dirac matrices and the 4D wave vector. Other features such as differences with BBTW model as well as the link between the Dirac operator following from our construction and the one suggested by Creutz using quaternions, are also given. Keywords: Graphene, Lattice QCD, 4D hyperdiamond, BBTW model, SU(5) Symmetry.

L. B Drissi; E. H Saidi; M. Bousmina

2011-06-26T23:59:59.000Z

278

Compressibility of graphene  

Science Journals Connector (OSTI)

We develop a theory for the compressibility and quantum capacitance of disordered monolayer and bilayer graphene, including the full hyperbolic band structure and band gap in the latter case. We include the effects of disorder in our theory, which are of particular importance at the carrier densities near the Dirac point. We account for this disorder statistically using two different averaging procedures: first via averaging over the density of carriers directly, and then via averaging in the density of states to produce an effective density of carriers. We also compare the results of these two models with experimental data, and to do this we introduce a model for interlayer screening which predicts the size of the band gap between the low-energy conduction and valence bands for arbitrary gate potentials applied to both layers of bilayer graphene. We find that both models for disorder give qualitatively correct results for gapless systems, but when there is a band gap in the low-energy band structure, the density of states averaging is incorrect and disagrees with the experimental data.

D. S. L. Abergel; E. H. Hwang; S. Das Sarma

2011-02-28T23:59:59.000Z

279

Quantum Critical Scaling in Graphene  

Science Journals Connector (OSTI)

We show that the emergent relativistic symmetry of electrons in graphene near its quantum critical point (QCP) implies a crucial importance of the Coulomb interaction. We derive scaling laws, valid near the QCP, that dictate the nontrivial magnetic and charge response of interacting graphene. Our analysis yields numerous predictions for how the Coulomb interaction will be manifested in experimental observables such as the diamagnetic response and electronic compressibility.

Daniel E. Sheehy and Jrg Schmalian

2007-11-30T23:59:59.000Z

280

Quantum search on graphene lattices  

E-Print Network [OSTI]

We present a continuous-time quantum search algorithm on a graphene lattice. This provides the sought-after implementation of an efficient continuous-time quantum search on a two-dimensional lattice. The search uses the linearity of the dispersion relation near the Dirac point and can find a marked site on a graphene lattice faster than the corresponding classical search. The algorithm can also be used for state transfer and communication.

Iain Foulger; Sven Gnutzmann; Gregor Tanner

2013-12-13T23:59:59.000Z

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Graphene Oxides Dispersing and Hosting Graphene Sheets for Unique Nanocomposite Materials  

Science Journals Connector (OSTI)

Graphene Oxides Dispersing and Hosting Graphene Sheets for Unique Nanocomposite Materials ... Graphene oxides (GOs), beyond their widely reported use as precursors for single-layer graphene sheets, are in fact excellent materials themselves (polymers in two-dimension, polyelectrolyte-like, aqueous solubility and biocompatibility, etc.). ... In this reported work we used aqueous GOs to effectively disperse few-layer graphene sheets (GNs) in suspension for facile wet-processing into nanocomposites of GNs embedded in GOs (as the polymeric matrix). ...

Leilei Tian; Parambath Anilkumar; Li Cao; Chang Yi Kong; Mohammed J. Meziani; Haijun Qian; L. Monica Veca; Tim J. Thorne; Kenneth N. Tackett; II; Travis Edwards; Ya-Ping Sun

2011-03-16T23:59:59.000Z

282

Studies of bilayer and trilayer graphene  

E-Print Network [OSTI]

Graphene is a single 2-dimensional atomic layer of hexagonally packed carbon atoms. Graphene has a unique combination of thermal, mechanical, and electronic properties, making it a useful tool for learning new physics as ...

Cela, Devin Artan

2013-01-01T23:59:59.000Z

283

Casimir interactions between graphene sheets and metamaterials  

SciTech Connect (OSTI)

The Casimir force between graphene sheets and metamaterials is studied. Theoretical results based on the Lifshitz theory for layered, planar, two-dimensional systems in media are presented. We consider graphene-graphene, graphene-metamaterial, and metal-graphene-metamaterial configurations. We find that quantum effects of the temperature-dependent force are not apparent until the submicron range. In contrast to results with bulk dielectric and bulk metallic materials, no Casimir repulsion is found when graphene is placed on top of a magnetically active metamaterial substrate, regardless of the strength of the low-frequency magnetic response. In the case of the metal-graphene-metamaterial setting, repulsion between the metamaterial and the metal-graphene system is possible only when the dielectric response from the metal contributes significantly.

Drosdoff, D.; Woods, Lilia M. [Department of Physics, University of South Florida, Tampa, Florida 33620 (United States)

2011-12-15T23:59:59.000Z

284

Applications of Graphene Devices in RF Communications  

E-Print Network [OSTI]

Graphene, a one-atom-thick layer of carbon atoms arranged in a honeycomb lattice, has recently attracted great interest among physicists and engineers. The combination of the unique properties of graphene with new device ...

Palacios, Tomas

285

Breakdown in the Wetting Transparency of Graphene  

E-Print Network [OSTI]

We develop a theory to model the van der Waals interactions between liquid and graphene, including quantifying the wetting behavior of a graphene-coated surface. Molecular dynamics simulations and contact angle measurements ...

Shih, Chih-Jen

286

Unconventional plasmon-phonon coupling in graphene  

E-Print Network [OSTI]

We predict the existence of coupled plasmon-phonon excitations in graphene by using the self-consistent linear response formalism. The unique electron-phonon interaction in graphene leads to unconventional mixing of plasmon ...

Jablan, Marinko

287

Transverse electric plasmons in bilayer graphene  

E-Print Network [OSTI]

We predict the existence of transverse electric (TE) plasmons in bilayer graphene. We find that their plasmonic properties are much more pronounced in bilayer than in monolayer graphene, in a sense that they can get more ...

Jablan, Marinko

288

Cleaning graphene with a titanium sacrificial layer  

SciTech Connect (OSTI)

Graphene is a promising material for future electronic applications and chemical vapor deposition of graphene on copper is a promising method for synthesizing graphene on the wafer scale. The processing of such graphene films into electronic devices introduces a variety of contaminants which can be difficult to remove. An approach to cleaning residues from the graphene channel is presented in which a thin layer of titanium is deposited via thermal e-beam evaporation and immediately removed. This procedure does not damage the graphene as evidenced by Raman spectroscopy, greatly enhances the electrical performance of the fabricated graphene field effect transistors, and completely removes the chemical residues from the surface of the graphene channel as evidenced by x-ray photoelectron spectroscopy.

Joiner, C. A., E-mail: cjoiner3@gatech.edu; Roy, T.; Hesabi, Z. R.; Vogel, E. M. [School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States); Chakrabarti, B. [School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States); Department of Materials Science and Engineering, The University of Texas at Dallas, Richardson, Texas 75080 (United States)

2014-06-02T23:59:59.000Z

289

Midway Islands: Language Situation  

Science Journals Connector (OSTI)

The Midway Islands, a coral atoll in the North Pacific Ocean, is a U.S.-administered wildlife refuge currently closed to the public. The population now consists of about 40 people, the staff of the U.S. Fish and Wildlife Service, a division of the Department of the Interior. The official language of Midway is English.

2006-01-01T23:59:59.000Z

290

Phonons in twisted bilayer graphene  

Science Journals Connector (OSTI)

We theoretically investigate phonon dispersion in AA-stacked, AB-stacked, and twisted bilayer graphene with various rotation angles. The calculations are performed using the Bornvon Karman model for the intralayer atomic interactions and the Lennard-Jones potential for the interlayer interactions. It is found that the stacking order affects the out-of-plane acoustic phonon modes the most. The difference in the phonon densities of states in the twisted bilayer graphene and in AA- or AB-stacked bilayer graphene appears in the phonon frequency range 90110 cm?1. Twisting bilayer graphene leads to the emergence of different phonon branchestermed hybrid folded phononswhich originate from the mixing of phonon modes from different high-symmetry directions in the Brillouin zone. The frequencies of the hybrid folded phonons depend strongly on the rotation angle and can be used for noncontact identification of the twist angles in graphene samples. The obtained results and the tabulated frequencies of phonons in twisted bilayer graphene are important for the interpretation of experimental Raman data and in determining the thermal conductivity of these material systems.

Alexandr I. Cocemasov; Denis L. Nika; Alexander A. Balandin

2013-07-15T23:59:59.000Z

291

Parametric interatomic potential for graphene  

Science Journals Connector (OSTI)

A parametric interatomic potential is constructed for graphene. The potential energy consists of two parts: a bond energy function and a radial interaction energy function. The bond energy function is based on the Tersoff-Brenner potential model. It includes angular terms and explicitly accounts for flexural deformation of the lattice normal to the plane of graphene. It determines the cohesive energy of graphene and its equilibrium lattice constant. The radial energy function has been chosen such that it does not contribute to the binding energy or the equilibrium lattice constant but contributes to the interatomic force constants. The range of interaction of each atom extends up to its fourth-neighbor atoms in contrast to the Tersoff-Brenner potential, which extends only up to second neighbors. The parameters of the potential are obtained by fitting the calculated values to the cohesive energy, lattice constant, elastic constants, and phonon frequencies of graphene. The values of the force constants between an atom and other atoms that are within its fourth-neighbor distance are calculated. Analytical expressions are given for the elastic constants and the flexural rigidity of graphene. The flexural rigidity of the graphene lattice is found to be 2.13 eV, which is much higher than 0.797 eV calculated earlier using the Tersoff-Brenner potential.

V. K. Tewary and B. Yang

2009-02-27T23:59:59.000Z

292

Disorder-free sputtering method on graphene  

SciTech Connect (OSTI)

Deposition of various materials onto graphene without causing any disorder is highly desirable for graphene applications. Especially, sputtering is a versatile technique to deposit various metals and insulators for spintronics, and indium tin oxide to make transparent devices. However, the sputtering process causes damage to graphene because of high energy sputtered atoms. By flipping the substrate and using a high Ar pressure, we demonstrate that the level of damage to graphene can be reduced or eliminated in dc, rf, and reactive sputtering processes.

Qiu Xue Peng; Shin Young Jun; Niu Jing; Kulothungasagaran, Narayanapillai [Department of Electrical and Computer Engineering, National University of Singapore, 117576 (Singapore); Kalon, Gopinadhan; Yang, Hyunsoo [Department of Electrical and Computer Engineering, National University of Singapore, 117576 (Singapore); Graphene Research Centre, National University of Singapore, 117546 (Singapore); Qiu Caiyu [Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637616 (Singapore); Yu Ting [Graphene Research Centre, National University of Singapore, 117546 (Singapore); Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637616 (Singapore)

2012-09-15T23:59:59.000Z

293

Plasmons in graphene on uniaxial substrates  

SciTech Connect (OSTI)

Placing graphene on uniaxial substrates may have interesting application potential for graphene-based photonic and optoelectronic devices. Here, we analytically derive the dispersion relation for graphene plasmons on uniaxial substrates and discuss their momentum, propagation length, and polarization as a function of frequency, propagation direction, and both ordinary and extraordinary dielectric permittivities of the substrate. We find that the plasmons exhibit an anisotropic propagation, yielding radially asymmetric field patterns when a point emitter launches plasmons in the graphene layer.

Arrazola, I. [Universidad del Pas Vasco, 48940 Leioa (Spain) [Universidad del Pas Vasco, 48940 Leioa (Spain); CIC nanoGUNE Consolider, 20018 Donostia-San Sebastin (Spain); Hillenbrand, R.; Nikitin, A. Yu., E-mail: alexeynik@rambler.ru [CIC nanoGUNE Consolider, 20018 Donostia-San Sebastin (Spain); Ikerbasque, Basque Foundation for Science, 48011 Bilbao (Spain)

2014-01-06T23:59:59.000Z

294

Adsorbing H{sub 2}S onto a single graphene sheet: A possible gas sensor  

SciTech Connect (OSTI)

The electronic structure of pristine graphene sheet and the resulting structure of adsorbing a single molecule of H{sub 2}S on pristine graphene in three different sites (bridge, top, and hollow) are studied using the full potential linearized augmented plane wave method. Our calculations show that the adsorption of H{sub 2}S molecule on the bridge site opens up a small direct energy gap of about 0.1?eV at symmetry point M, while adsorption of H{sub 2}S on top site opens a gap of 0.3?eV around the symmetry point K. We find that adsorbed H{sub 2}S onto the hollow site of pristine graphene sheet causes to push the conduction band minimum and the valence band maximum towards Fermi level resulting in a metallic behavior. Comparing the angular momentum decomposition of the atoms projected electronic density of states of pristine graphene sheet with that of H{sub 2}Sgraphene for three different cases, we find a significant influence of the location of the H{sub 2}S molecule on the electronic properties especially the strong hybridization between H{sub 2}S molecule and graphene sheet.

Reshak, A. H., E-mail: maalidph@yahoo.co.uk [New Technologies-Research Centre, University of West Bohemia, Univerzitni 8, 306 14 Pilsen (Czech Republic); Center of Excellence Geopolymer and Green Technology, School of Material Engineering, University Malaysia Perlis, 01007 Kangar, Perlis (Malaysia); Auluck, S. [Council of Scientific and Industrial Research-National Physical Laboratory, Dr. K S Krishnan Marg, New Delhi 110012 (India)

2014-09-14T23:59:59.000Z

295

Utility Scale Wind Turbines on a Grid Connected Island Mohit Dua, Anthony L. Rogers, James F. Manwell,  

E-Print Network [OSTI]

Utility Scale Wind Turbines on a Grid Connected Island Mohit Dua, Anthony L. Rogers, James F utility scale wind turbines on Fox Islands, located 12 miles from the coast of Maine in the United States of electricity itself. Three locations are analyzed in detail as potential sites for wind turbine installations

Massachusetts at Amherst, University of

296

Technical Note Graphene: Substrate preparation and introduction  

E-Print Network [OSTI]

of Texas, Austin, TX, USA c Electron Microscopy Department of Materials Sciences, University of Ulm, Ulm September 2010 Accepted 4 October 2010 Available online xxxx Keywords: Graphene Graphene oxide Cryo-EM graphene substrates as well as their ongoing development. ? 2010 Elsevier Inc. All rights reserved. 1

297

4 - Graphene produced by electrochemical exfoliation  

Science Journals Connector (OSTI)

Abstract: The production of graphene by electrochemical exfoliation is described and methods of synthesis of high-quality graphene nanosheets on a large scale via the electrochemical exfoliation of graphite and/or electrochemical reduction of exfoliated graphite oxide in a selected electrolyte solution are discussed in depth. The potential of the process is explored and applications of electrochemically exfoliated graphene are examined.

S. Bose; T. Kuila; N.H. Kim; J.H. Lee

2014-01-01T23:59:59.000Z

298

Graphene-enabled Wireless Communication Networks  

E-Print Network [OSTI]

Graphene-enabled Wireless Communication Networks at the Nanoscale 1 Ignacio Llatser Nanonetworking;Graphene Honeycomb lattice of carbon atoms 2-dimensional material Discovered by A. K. Geim and K. S. Novoselov 9 Graphene G. Liu, W. Stillman, S. Rumyantsev, Q. Shao, M. Shur, A. A. Balandin, "Low

Politècnica de Catalunya, Universitat

299

Graphene Ferroelectric Heterostructures Santosh Raghavan1  

E-Print Network [OSTI]

Graphene Ferroelectric Heterostructures Santosh Raghavan1 , Dr. Jean-Savin Heron2 , Dr. Igor] Laboratory of Nanoscale Electronics and Structures, IEL, EPFL S D1 2 Doped Silicon SiO2 Graphene 3 4 1 2S D L Introduction Working Principle Graphene PVDF (-TrFE) PFM Measurements Retention Measurements Conclusion

Dalang, Robert C.

300

Graphene plasmonics for tunable terahertz metamaterials  

E-Print Network [OSTI]

Graphene plasmonics for tunable terahertz metamaterials Long Ju1 , Baisong Geng1,6 , Jason Horng1 metamaterials1­3 . Plasmons of two-dimensional massless electrons, as present in graphene, show unusual graphene micro- ribbonarrays.Wedemonstratethatgrapheneplasmonresonances can be tuned over a broad terahertz

Wang, Feng

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Patterning of graphene Wenbin Li,b  

E-Print Network [OSTI]

Patterning of graphene Ji Feng,a Wenbin Li,b Xiaofeng Qian,b Jingshan Qi,c Liang Qib and Ju Li of carbon (graphene, graphane, etc.) are amenable to unique patterning schemes such as cutting, bending theoretical understanding and processing routes for patterning graphene and highlight potential applications

Chen, Sow-Hsin

302

Charge Noise in Graphene Transistors Iddo Heller,,  

E-Print Network [OSTI]

Charge Noise in Graphene Transistors Iddo Heller,,§ Sohail Chatoor, Jaan Ma¨nnik, Marcel A. G an experimental study of 1/f noise in liquid-gated graphene transistors. We show that the gate dependence to the graphene, while at high carrier density it is consistent with noise due to scattering in the channel

Dekker, Cees

303

Seminar -4. letnik Landau Levels in Graphene  

E-Print Network [OSTI]

Seminar - 4. letnik Landau Levels in Graphene Author: Zala Lenarcic Mentor: prof. Anton Ramsak Ljubljana, December 2010 Abstract In this seminar I present graphene, a new material with promising to graphene's unusual energy dispersion. I will derive Landau levels for standard electrons, for electrons

Ramsak, Anton

304

DOE - Office of Legacy Management -- Staten Island Warehouse - NY 22  

Office of Legacy Management (LM)

Staten Island Warehouse - NY 22 Staten Island Warehouse - NY 22 FUSRAP Considered Sites Staten Island Warehouse, NY Alternate Name(s): Archer-Daniels Midland Company NY.22-3 Location: 2393 Richmond Terrace, Port Richmond, New York NY.22-2 Historical Operations: Stored pitchblende (high-grade uranium ore), which was purchased by the MED for the first atomic bomb. NY.22-3 Eligibility Determination: Eligible Radiological Survey(s): Assessment Survey NY.22-5 Site Status: Referred by DOE, evaluation in progess by U.S. Army Corps of Engineers. USACE Website Long-term Care Requirements: To be determined upon completion. Also see Documents Related to Staten Island Warehouse, NY NY.22-1 - MED Trip Report Summary; Authors: Ruhoff (Corps of Engineers) and Geddes (Stone & Webster); Subject: Trip to New York;

305

United States Virgin Islands: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Islands: Energy Resources Islands: Energy Resources (Redirected from Virgin Islands) Jump to: navigation, search Name United States Virgin Islands 2-letter ISO code VI 3-letter ISO code VIR Numeric ISO code 850 Equivalent URI DBpedia GeoNames ID 4796775 UN Region[1] Latin America and the Caribbean Coordinates 18.34829°, -64.98348° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":18.34829,"lon":-64.98348,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

306

Monomoscoy Island, Massachusetts: Energy Resources | Open Energy  

Open Energy Info (EERE)

Monomoscoy Island, Massachusetts: Energy Resources Monomoscoy Island, Massachusetts: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 41.5698322°, -70.505028° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.5698322,"lon":-70.505028,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

307

Long Island Power Authority | Open Energy Information  

Open Energy Info (EERE)

Long Island Power Authority Long Island Power Authority Address 333 Earle Ovington Blvd Place Uniondale, New York Zip 11553 Sector Services Product Green Power Marketer Website www.lipower.org/ Coordinates 40.720549°, -73.593524° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":40.720549,"lon":-73.593524,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

308

Cook Islands: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Cook Islands: Energy Resources Cook Islands: Energy Resources Jump to: navigation, search Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"TERRAIN","zoom":5,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"390px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":-22.26876,"lon":-158.20312,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

309

Microsoft Word - RailroadIsland_CX.docx  

Broader source: Energy.gov (indexed) [DOE]

2 2 REPLY TO ATTN OF: KEC-4 SUBJECT: Environmental Clearance Memorandum Dorie Welch Project Manager - KEWM-4 Proposed Action: Railroad Island Property Funding. Fish and Wildlife Project No.: 2011-003-00, Contract # BPA-006468 Categorical Exclusion Applied (from Subpart D, 10 C.F.R. Part 1021): B1.25 Real Property transfers for cultural protection, habitat preservation and wildlife management. Location: Monroe Quadrangle, in Lane County, Oregon (near Junction City, Oregon). Proposed by: Bonneville Power Administration (BPA) Description of the Proposed Action: The BPA is proposing to fund The Mackenzie River Trust (the Trust) to acquire a 63-acre parcel that will be known as Railroad Island. The Trust will provide BPA a conservation easement over the entire 63-acre property that will prevent

310

Popponesset Island, Massachusetts: Energy Resources | Open Energy  

Open Energy Info (EERE)

Popponesset Island, Massachusetts: Energy Resources Popponesset Island, Massachusetts: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 41.584277°, -70.4591932° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.584277,"lon":-70.4591932,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

311

Graphene and Quantum Mechanics University of California, Berkeley  

E-Print Network [OSTI]

Graphene and Quantum Mechanics Minjae Lee University of California, Berkeley lee.minjae@math.berkeley.edu March 31, 2014 Minjae Lee (UC Berkeley) Graphene March 31, 2014 1 / 9 #12;Carbon structures Graphite 3 Berkeley) Graphene March 31, 2014 2 / 9 #12;Graphene Graphene A single layer of graphite The thinnest 2D

Zworski, Maciej

312

Graphene: From Diffusive to Ultraclean-Interacting Systems  

E-Print Network [OSTI]

Graphene: From Diffusive to Ultraclean-Interacting Systems Inauguraldissertation zur Erlangung der. Introduction 1 2. The Properties of Graphene 3 2.1. Band Structure of Graphene . . . . . . . . . . . . . . . . . . . . . 3 2.1.1. Single Layer Graphene . . . . . . . . . . . . . . . . . . . . 3 2.1.2. Bilayer Graphene

Amrhein, Valentin

313

Nonlinear magnetization of graphene  

Science Journals Connector (OSTI)

We compute the magnetization of graphene in a magnetic field, taking into account for generality the possibility of a mass gap. We concentrate on the physical regime where quantum oscillations are not observed due to the effect of the temperature or disorder and show that the magnetization exhibits nonlinear behavior as a function of the applied field, reflecting the strong nonanalyticity of the two-dimensional effective action of Dirac electrons. The necessary values of the magnetic field to observe this nonlinearity vary from a few teslas for very clean suspended samples to 2030 T for good samples on substrate. In the light of these calculations, we discuss the effects of disorder and interactions as well as the experimental conditions under which the predictions can be observed.

Sergey Slizovskiy and Joseph J. Betouras

2012-09-24T23:59:59.000Z

314

Bound States in Graphene  

E-Print Network [OSTI]

We present a quantum analysis of the massless excitations in graphene with a charge impurity. When the effective charge exceeds a certain critical value, the spectrum is quantized and is unbounded from below. The corresponding eigenstates are square-integrable at infinity and have a rapidly oscillatory behaviour in the short distance, which can be interpreted as a fall to the centre. Using a cutoff regularization, we show that the effective Coulomb interaction strength is driven to its critical value under the renormalization group flow. In the subcritical region, we find bound states with imaginary values of the energy for certain range of the system parameters. The physical significance of these bound states with imaginary eigenvalues is discussed.

Kumar S. Gupta; Siddhartha Sen

2008-05-22T23:59:59.000Z

315

Photoconductivity of intrinsic graphene  

Science Journals Connector (OSTI)

We examine the photoconductivity of an intrinsic graphene associated with far- and midinfrared irradiation at low temperatures. The model under consideration accounts for the excitation of the electron-hole pairs by incident radiation, the interband generation-recombination transitions due to thermal radiation, and the intraband energy relaxation due to acoustic phonon scattering. The momentum relaxation is assumed to be caused by elastic scattering. The pertinent collision integrals are adapted for the case of the massless energy spectrum of carriers that interact with the longitudinal acoustic mode and the thermal radiation. It is found that the photoconductivity is determined by interplay between weak energy relaxation and generation-recombination processes. Due to this, the threshold of nonlinear response is fairly low.

F. T. Vasko and V. Ryzhii

2008-05-22T23:59:59.000Z

316

Charging Graphene for Energy Storage  

SciTech Connect (OSTI)

Since 2004, graphene, including single atomic layer graphite sheet, and chemically derived graphene sheets, has captured the imagination of researchers for energy storage because of the extremely high surface area (2630 m2/g) compared to traditional activated carbon (typically below 1500 m2/g), excellent electrical conductivity, high mechanical strength, and potential for low cost manufacturing. These properties are very desirable for achieving high activity, high capacity and energy density, and fast charge and discharge. Chemically derived graphene sheets are prepared by oxidation and reduction of graphite1 and are more suitable for energy storage because they can be made in large quantities. They still contain multiply stacked graphene sheets, structural defects such as vacancies, and oxygen containing functional groups. In the literature they are also called reduced graphene oxide, or functionalized graphene sheets, but in this article they are all referred to as graphene for easy of discussion. Two important applications, batteries and electrochemical capacitors, have been widely investigated. In a battery material, the redox reaction occurs at a constant potential (voltage) and the energy is stored in the bulk. Therefore, the energy density is high (more than 100 Wh/kg), but it is difficult to rapidly charge or discharge (low power, less than 1 kW/kg)2. In an electrochemical capacitor (also called supercapacitors or ultracapacitor in the literature), the energy is stored as absorbed ionic species at the interface between the high surface area carbon and the electrolyte, and the potential is a continuous function of the state-of-charge. The charge and discharge can happen rapidly (high power, up to 10 kW/kg) but the energy density is low, less than 10 Wh/kg2. A device that can have both high energy and high power would be ideal.

Liu, Jun

2014-10-06T23:59:59.000Z

317

Fast diffusion of a graphene flake on a graphene layer  

Science Journals Connector (OSTI)

Diffusion of a graphene flake on a graphene layer is analyzed and a diffusion mechanism is proposed for the system under consideration. According to this mechanism, rotational transition of the flake from commensurate to incommensurate states takes place with subsequent simultaneous rotation and translational motion until the commensurate state is reached again, and so on. The molecular dynamics simulations and analytic estimates based on ab initio and semiempirical calculations demonstrate that the proposed diffusion mechanism is dominant at temperatures T?(13)Tcom, where Tcom corresponds to the barrier for transitions of the flake between adjacent energy minima in the commensurate states. For example, for the flake consisting of ?40, 200, and 700 atoms the contribution of the proposed diffusion mechanism through rotation of the flake to the incommensurate states exceeds that for diffusion of the flake in the commensurate states by one to two orders of magnitude at temperatures 50150 K, 200600 K, and 8002400 K, respectively. The possibility to experimentally measure the barriers to relative motion of graphene layers based on the study of diffusion of a graphene flake is considered. The results obtained are also relevant for understanding of dynamic behavior of polycyclic aromatic molecules on graphene and should be qualitatively valid for a set of commensurate adsorbate-adsorbent systems.

Irina V. Lebedeva; Andrey A. Knizhnik; Andrey M. Popov; Olga V. Ershova; Yurii E. Lozovik; Boris V. Potapkin

2010-10-29T23:59:59.000Z

318

Highly controllable and green reduction of graphene oxide to flexible graphene film with high strength  

SciTech Connect (OSTI)

Graphical abstract: Highly controllable and green reduction of GO to chemical converted graphene (CCG) was achieved with sodium citrate as a facile reductant. Self-assembly of the as-made CCG sheets results in a flexible CCG film, of which the tensile strength strongly depends on the deoxygenation degree of graphene sheets. - Highlights: Graphene was synthesized by an effective and environmentally friendly approach. We introduced a facile X-ray diffraction analysis method to investigate the reduction process from graphene oxide to graphene. Flexible graphene films were prepared by self-assembly of the graphene sheets. The strength of the graphene films depends on the reduction degree of graphene. - Abstract: Graphene film with high strength was fabricated by the assembly of graphene sheets derived from graphene oxide (GO) in an effective and environmentally friendly approach. Highly controllable reduction of GO to chemical converted graphene (CCG) was achieved with sodium citrate as a facile reductant, in which the reduction process was monitored by XRD analysis and UVvis absorption spectra. Self-assembly of the as-made CCG sheets results in a flexible CCG film. This method may open an avenue to the easy and scalable preparation of graphene film with high strength which has promising potentials in many fields where strong, flexible and electrically conductive films are highly demanded.

Wan, Wubo [Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, Dalian University of Technology, Dalian 116024 (China); Zhao, Zongbin, E-mail: zbzhao@dlut.edu.cn [Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, Dalian University of Technology, Dalian 116024 (China); Hu, Han [Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, Dalian University of Technology, Dalian 116024 (China); Gogotsi, Yury [Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, Dalian University of Technology, Dalian 116024 (China); Department of Materials Science and Engineering, and A.J. Drexel Nanotechnology Institute, Drexel University, Philadelphia, PA 19104 (United States); Qiu, Jieshan, E-mail: jqiu@dlut.edu.cn [Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, Dalian University of Technology, Dalian 116024 (China)

2013-11-15T23:59:59.000Z

319

NUCLEAR ISLANDS International Leasing  

Broader source: Energy.gov (indexed) [DOE]

ISLANDS ISLANDS International Leasing of Nuclear Fuel Cycle Sites to Provide Enduring Assurance of Peaceful Use Christopher E. Paine and Thomas B. Cochran Current International Atomic Energy Agency safeguards do not provide adequate protection against the diversion to military use of materials or technology from certain types of sensitive nuclear fuel cycle facilities. In view of highly enriched uranium's relatively greater ease of use as a nuclear explosive material than plutonium and the significant diseconomies of commercial spent fuel reprocessing, this article focuses on the need for improved international controls over uranium enrichment facilities as the proximate justification for creation of an International Nuclear Fuel Cycle Association (INFCA). In principle, the proposal is equally applicable to alleviating the proliferation concerns provoked by nuclear fuel

320

Rhode Island.indd  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Rhode Island Rhode Island www.effi cientwindows.org March 2013 1. Meet the Energy Code and Look for the ENERGY STAR ® Windows must comply with your local energy code. Windows that are ENERGY STAR qualifi ed typically meet or exceed energy code requirements. To verify if specific window energy properties comply with the local code requirements, go to Step 2. 2. Look for Effi cient Properties on the NFRC Label The National Fenestration Rating Council (NFRC) label is needed for verifi cation of energy code compliance (www.nfrc. org). The NFRC label displays whole- window energy properties and appears on all fenestration products which are part of the ENERGY STAR program.

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Plasmon-phonon coupling in graphene  

Science Journals Connector (OSTI)

Collective excitations of coupled electron-phonon systems are calculated for both monolayer and bilayer graphenes, taking into account the nonperturbative Coulomb coupling between electronic excitations in graphene and the substrate longitudinal-optical phonon modes. We find that the plasmon-phonon coupling in monolayer graphene is strong at all densities but in bilayer graphene the coupling is significant only at high densities satisfying the resonant condition ?pl??ph. The difference arises from the peculiar screening properties associated with chirality of graphene. Plasmon-phonon coupling explains the measured quasilinear plasmon dispersion in the long-wavelength limit, thus resolving a puzzle in the experimental observations.

E. H. Hwang; Rajdeep Sensarma; S. Das Sarma

2010-11-03T23:59:59.000Z

322

Tunable Electrochemical Properties of Fluorinated Graphene  

SciTech Connect (OSTI)

The structural and electrochemical properties of fluorinated graphene have been investigated by using a series of graphene fluorides (CFx, x=0.47, 0.66, 0.89). Fluorinated graphene exhibited high capacity retentions of 75-81% of theoretical capacity at moderate rates as cathode materials for primary lithium batteries. Specifically, CF0.47 maintained a capacity of 356 mAhg-1 at a 5C rate, superior to that of traditional fluorinated graphite. The discharged graphene fluorides also provide an electrochemical tool to probe the chemical bonding on the parent graphene substrate.

Meduri, Praveen; Chen, Honghao; Xiao, Jie; Martinez, Jayson J.; Carlson, Thomas J.; Zhang, Jiguang; Deng, Zhiqun

2013-06-18T23:59:59.000Z

323

Relativistic graphene ratchet on semidisk Galton board  

E-Print Network [OSTI]

Using extensive Monte Carlo simulations we study numerically and analytically a photogalvanic effect, or ratchet, of directed electron transport induced by a microwave radiation on a semidisk Galton board of antidots in graphene. A comparison between usual two-dimensional electron gas (2DEG) and electrons in graphene shows that ratchet currents are comparable at very low temperatures. However, a large mean free path in graphene should allow to have a strong ratchet transport at room temperatures. Also in graphene the ratchet transport emerges even for unpolarized radiation. These properties open promising possibilities for room temperature graphene based sensitive photogalvanic detectors of microwave and terahertz radiation.

Leonardo Ermann; Dima L. Shepelyansky

2010-10-21T23:59:59.000Z

324

How Graphene Slides: Measurement and Theory of Strain-Dependent Frictional Forces between Graphene and SiO2  

Science Journals Connector (OSTI)

How Graphene Slides: Measurement and Theory of Strain-Dependent Frictional Forces between Graphene and SiO2 ... Strain, bending rigidity, and adhesion are interwoven in determining how graphene responds when pulled across a substrate. ... Using Raman spectroscopy of circular, graphene-sealed microchambers under variable external pressure, we demonstrate that graphene is not firmly anchored to the substrate when pulled. ...

Alexander L. Kitt; Zenan Qi; Sebastian Rmi; Harold S. Park; Anna K. Swan; Bennett B. Goldberg

2013-04-29T23:59:59.000Z

325

Graphene on Ru(0001) Moire Corrugation Studied by Scanning Tunneling Microscopy on Au/Graphene/Ru(0001) Heterostructures  

E-Print Network [OSTI]

Graphene on Ru(0001) Moire Corrugation Studied by Scanning Tunneling Microscopy on Au/Graphene on graphene/Ru(0001) were used to study the corrugation of the moire structure of graphene/Ru(0001 for the graphene/Ru(0001) moire is of structural nature rather than electronic. STM showed a large value

Ciobanu, Cristian

326

Washington Island El Coop, Inc | Open Energy Information  

Open Energy Info (EERE)

Washington Island El Coop, Inc Washington Island El Coop, Inc Place Wisconsin Utility Id 20153 Utility Location Yes Ownership C NERC Location RFC NERC RFC Yes ISO MISO Yes Operates Generating Plant Yes Activity Generation Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Electric Heat Residential General Service Commercial General Service Seasonal Commercial Average Rates Residential: $0.1820/kWh Commercial: $0.1330/kWh References ↑ "EIA Form EIA-861 Final Data File for 2010 - File1_a" Retrieved from "http://en.openei.org/w/index.php?title=Washington_Island_El_Coop,_Inc&oldid=412150

327

Village of Green Island, New York (Utility Company) | Open Energy  

Open Energy Info (EERE)

Green Island Green Island Place New York Utility Id 7600 Utility Location Yes Ownership M NERC Location NPCC NERC NPCC Yes ISO NY Yes Operates Generating Plant Yes Activity Generation Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Commercial -- Non-Demand Rate Commercial Commercial with Demand Rate Commercial Residential and Religious Rate Residential Average Rates Residential: $0.0999/kWh Commercial: $0.1000/kWh References ↑ "EIA Form EIA-861 Final Data File for 2010 - File1_a" Retrieved from "http://en.openei.org/w/index.php?title=Village_of_Green_Island,_New_York_(Utility_Company)&oldid=411997

328

Domain formation on oxidized graphene  

Science Journals Connector (OSTI)

Using first-principles calculations within density functional theory, we demonstrate that the adsorption of a single oxygen atom results in significant electron transfer from graphene to oxygen. This strongly disturbs the charge landscape of the C-C bonds at the proximity. Additional oxygen atoms adsorbing to graphene prefer always the C-C bonds having the highest charge density and, consequently, they have the tendency to form domain structure. While oxygen adsorption to one side of graphene ends with significant buckling, the adsorption to both sides with similar domain pattern is favored. The binding energy displays an oscillatory variation and the band gap widens with increasing oxygen coverage. While a single oxygen atom migrates over the C-C bonds on the graphene surface, a repulsive interaction prevents two oxygen adatoms from forming an oxygen molecule. Our first-principles study together with finite-temperature ab initio molecular dynamics calculations conclude that oxygen adatoms on graphene can not desorb easily without the influence of external agents.

M. Topsakal and S. Ciraci

2012-11-01T23:59:59.000Z

329

Diamond as an inert substrate of graphene  

SciTech Connect (OSTI)

Interaction between graphene and semiconducting diamond substrate has been examined with large-scale density functional theory calculations. Clean and hydrogenated diamond (100) and (111) surfaces have been studied. It turns out that weak van der Waals interactions dominate for graphene on all these surfaces. High carrier mobility of graphene is almost not affected, except for a negligible energy gap opening at the Dirac point. No charge transfer between graphene and diamond (100) surfaces is detected, while different charge-transfer complexes are formed between graphene and diamond (111) surfaces, inducing either p-type or n-type doping on graphene. Therefore, diamond can be used as an excellent substrate of graphene, which almost keeps its electronic structures at the same time providing the flexibility of charge doping.

Hu Wei; Li Zhenyu; Yang Jinlong [Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China)

2013-02-07T23:59:59.000Z

330

Counting molecular-beam grown graphene layers  

SciTech Connect (OSTI)

We have used the ratio of the integrated intensity of graphene's Raman G peak to that of the silicon substrate's first-order optical phonon peak, accurately to determine the number of graphene layers across our molecular-beam (MB) grown graphene films. We find that these results agree well both, with those from our own exfoliated single and few-layer graphene flakes, and with the results of Koh et al.[ACS Nano 5, 269 (2011)]. We hence distinguish regions of single-, bi-, tri-, four-layer, etc., graphene, consecutively, as we scan coarsely across our MB-grown graphene. This is the first, but crucial, step to being able to grow, by such molecular-beam-techniques, a specified number of large-area graphene layers, to order.

Plaut, Annette S. [School of Physics, University of Exeter, Exeter EX4 4QL (United Kingdom)] [School of Physics, University of Exeter, Exeter EX4 4QL (United Kingdom); Wurstbauer, Ulrich [Department of Physics, Columbia University, New York, New York 10027 (United States)] [Department of Physics, Columbia University, New York, New York 10027 (United States); Pinczuk, Aron [Department of Physics, Columbia University, New York, New York 10027 (United States) [Department of Physics, Columbia University, New York, New York 10027 (United States); Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027 (United States); Garcia, Jorge M. [MBE Lab, IMM-Instituto de Microelectronica de Madrid (CNM-CSIC), Madrid, E-28760 (Spain)] [MBE Lab, IMM-Instituto de Microelectronica de Madrid (CNM-CSIC), Madrid, E-28760 (Spain); Pfeiffer, Loren N. [Electrical Engineering Department, Princeton University, New Jersey 08544 (United States)] [Electrical Engineering Department, Princeton University, New Jersey 08544 (United States)

2013-06-17T23:59:59.000Z

331

Graphene-Based Optical Biosensors and Imaging  

SciTech Connect (OSTI)

This chapter focuses on the design, fabrication and application of graphene based optical nanobiosensors. The emerging graphene based optical nanobiosensors demonstrated the promising bioassay and biomedical applications thanking to the unique optical features of graphene. According to the different applications, the graphene can be tailored to form either fluorescent emitter or efficient fluorescence quencher. The exceptional electronic feature of graphene makes it a powerful platform for fabricating the SPR and SERS biosensors. Today the graphene based optical biosensors have been constructed to detect various targets including ions, small biomolecules, DNA/RNA and proteins. This chapter reviews the recent progress in graphene-based optical biosensors and discusses the opportunities and challenges in this field.

Tang, Zhiwen; He, Shijiang; Pei, Hao; Du, Dan; Fan, Chunhai; Lin, Yuehe

2014-01-13T23:59:59.000Z

332

Early Migratory Behavior of Northern Fur Seal (Callorhinus ursinus) Pups from Bering Island, Russia  

E-Print Network [OSTI]

examined the early migratory behavior and habitat associations of pups from Bering Island (BI), Russia. I instrumented 35 pups with Mk10-AL satellite tags and stomach temperature telemeters which provided diving, foraging and location data. I hypothesized...

Lee, Olivia Astillero

2012-07-16T23:59:59.000Z

333

Measuring vertical tectonic motion at the intersection of the Santa CruzCatalina Ridge and Northern Channel Islands platform, California Continental Borderland, using submerged paleoshorelines  

Science Journals Connector (OSTI)

...Locations of DELTA submersible dives made on...Channel Islands platform and Santa Cruza...Channel Islands platform, specifically...of numerous submersible dives because...parallel and semi-parallel to...observed during submersible dives on the...Channel Islands platform and Pilgrim...

Jason D. Chaytor; Chris Goldfinger; Melissa A. Meiner; Gary J. Huftile; Christopher G. Romsos; Mark R. Legg

334

Graphene quantum point contact transistor for DNA sensing  

Science Journals Connector (OSTI)

Graphene quantum point contact transistor for DNA...the position and size of a nanopore in graphene nanoribbons can strongly affect its electronic...nanopore. In particular, we show that a graphene membrane with quantum point contact geometry...

Anuj Girdhar; Chaitanya Sathe; Klaus Schulten; Jean-Pierre Leburton

2013-01-01T23:59:59.000Z

335

Graphene cover-promoted metal-catalyzed reactions  

Science Journals Connector (OSTI)

Graphene cover-promoted metal-catalyzed reactions...Pt(111) surface covered by monolayer graphene sheets. Surface science measurements...functional calculations show that the graphene overlayer weakens the strong interaction...

Yunxi Yao; Qiang Fu; Y. Y. Zhang; Xuefei Weng; Huan Li; Mingshu Chen; Li Jin; Aiyi Dong; Rentao Mu; Peng Jiang; Li Liu; Hendrik Bluhm; Zhi Liu; S. B. Zhang; Xinhe Bao

2014-01-01T23:59:59.000Z

336

Graphene nanostructures as tunable storage media for molecular hydrogen  

Science Journals Connector (OSTI)

Graphene nanostructures as tunable storage media...structures of nano-graphite platelets (graphene), which are light-weight, cheap, chemically...Methods A computationally tractable model of graphene is provided by quantum-mechanical description...

Serguei Patchkovskii; John S. Tse; Sergei N. Yurchenko; Lyuben Zhechkov; Thomas Heine; Gotthard Seifert

2005-01-01T23:59:59.000Z

337

Graphene field effect transistor without an energy gap  

Science Journals Connector (OSTI)

Graphene field effect transistor without an energy...of Technology, Pasadena, CA 91125; Graphene is a room temperature ballistic electron...relativistic massless electrons in pristine graphene exhibit unimpeded Klein tunneling penetration...

Min Seok Jang; Hyungjun Kim; Young-Woo Son; Harry A. Atwater; William A. Goddard III

2013-01-01T23:59:59.000Z

338

Graphene Layer Growth Chemistry: Five-Six-Ring Flip Reaction  

E-Print Network [OSTI]

are incorporated into growing graphene layers and hence willGRAPHENE LAYER GROWTH CHEMISTRY: FIVE-SIX-RING FLIP REACTIONon the zigzag edge of a graphene layer. A new reaction

Whitesides, R.; Domin, D.; Salomon-Ferrer, R.; Lester Jr., W.A.; Frenklach, M.

2008-01-01T23:59:59.000Z

339

Graphene Growth by Metal Etching on Ru (0001)  

E-Print Network [OSTI]

of step etching during graphene growth, such as in Fig. 3,adsorption of water on graphene structures will be describedRu(0001) Figure 5. a b c graphene Ru d Figure 6. Figure 7. a

Loginova, Elena

2010-01-01T23:59:59.000Z

340

Graphene Layer Growth Chemistry: Five-Six-Ring Flip Reaction  

E-Print Network [OSTI]

25-28, 2007. Topic: Soot GRAPHENE LAYER GROWTH CHEMISTRY:on the zigzag edge of a graphene layer isomerizes to reversea possibly important step in graphene layer growth, thus

Whitesides, Russell; Domin, Dominik; Lester Jr., William A.; Frenklach, Michael

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Graphene nanoribbons in criss-crossed electric and magnetic fields  

Science Journals Connector (OSTI)

...Electronic and photonic properties of graphene layers and carbon nanoribbons' compiled...Gumbs, Danhong Huang and Oleksiy Roslyak Graphene nanoribbons in criss-crossed electric...Kirtland Air Force Base, , NM-87117, USA Graphene nanoribbons (GNRs) in mutually perpendicular...

2010-01-01T23:59:59.000Z

342

Graphene growth with giant domains using chemical vapor deposition  

E-Print Network [OSTI]

N. Martensson, Controlling graphene corrugation on lattice-in patterned epitaxial graphene, Science, 2006, 312(5777), 92009, 4(6), 17 A. K. Geim, Graphene: Status and Prospects,

Yong, Virginia; Hahn, H. Thomas

2011-01-01T23:59:59.000Z

343

Graphene Electronic Device Based Biosensors and Chemical Sensors  

E-Print Network [OSTI]

Solution-Gated Epitaxial Graphene as pH Sensor" [31] F.Enhanced Performance in Graphene FET" [32] F. Chen, Q. Qing,Based on CVD-Grown Graphene Sheets" [37] Park, S. and Ruoff,

Jiang, Shan

2014-01-01T23:59:59.000Z

344

Dirac Charge Dynamcs in Graphene by Infrared Spectroscopy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Dirac Charge Dynamcs in Graphene by Infrared Spectroscopy Dirac Charge Dynamcs in Graphene by Infrared Spectroscopy Print Wednesday, 29 October 2008 00:00 Graphene-a single layer...

345

Graphene-based plasmonic photodetector for photonic integrated circuits  

Science Journals Connector (OSTI)

We developed a planar-type graphene-based plasmonic photodetector (PD) for the development of all-graphene photonic-integrated-circuits (PICs). By configuring the graphene plasmonic...

Kim, Jin Tae; Yu, Young-Jun; Choi, Hongkyw; Choi, Choon-Gi

2014-01-01T23:59:59.000Z

346

Graphene mode-locked femtosecond laser at 2?m wavelength  

Science Journals Connector (OSTI)

We experimentally demonstrated a passively mode-locked femtosecond laser by using a graphene-based saturable absorber mirror (graphene SAM) in the spectral region of 2?m. The graphene...

Ma, J; Xie, G Q; Lv, P; Gao, W L; Yuan, P; Qian, L J; Yu, H H; Zhang, H J; Wang, J Y; Tang, D Y

2012-01-01T23:59:59.000Z

347

Many-body interactions in quasi-freestanding graphene  

E-Print Network [OSTI]

ects in doped and undoped graphene: Fermi liquid versus non-GW many-body ef- fects in graphene. Phys. Rev. Lett. 101:the spectral func- tion of graphene. Phys. Rev. B 77:081411(

Siegel, David

2012-01-01T23:59:59.000Z

348

Self-doping effects in epitaxially grown graphene  

E-Print Network [OSTI]

The electronic properties of graphene, Rev. Mod. Phys. (inE?ects in Epitaxially-Grown Graphene D.A. Siegel, 1, 2 S.Y.2009) Abstract Self-doping in graphene has been studied by

Siegel, David A.

2009-01-01T23:59:59.000Z

349

Substrate-induced band gap opening in epitaxial graphene  

E-Print Network [OSTI]

H.A. Electronic states of graphene nanoribbons studied withS.G. Louie. Energy gaps in graphene nanoribbons. Phys. Rev.band-gap engineering of graphene nanoribbons. Phys. Rev.

2008-01-01T23:59:59.000Z

350

Gas Separation With Graphene Membranes By Will Soutter  

E-Print Network [OSTI]

Gas Separation With Graphene Membranes By Will Soutter Introduction What is Graphene? Benefits of Graphene in Gas Separation Membranes Recent Developments Conclusion References Introduction The separation applications including fuel cells, batteries, gas sensors and gas purification. The materials

Bunch, Scott

351

The application of graphene in lithium ion battery electrode materials  

Science Journals Connector (OSTI)

Graphene is composed of a single atomic layer ... concept, structure, properties, preparation methods of graphene and its application in lithium ion batteries. A continuous 3D conductive network formed by graphene

Jiping Zhu; Rui Duan; Sheng Zhang; Nan Jiang; Yangyang Zhang; Jie Zhu

2014-10-01T23:59:59.000Z

352

Gigahertz Ambipolar Frequency Multiplier Based on Cvd Graphene  

E-Print Network [OSTI]

Ambipolar transport in graphene offers great opportunities for novel device and circuit applications. This paper discusses the RF performance of CVD grown graphene transistors for the first time. Then, a new graphene ...

Wang, Han

353

Klein backscattering and Fabry-Perot resonances in graphene  

E-Print Network [OSTI]

Klein backscattering and Fabry- Perot resonances in graphene p-n-p junctions Leonid Levitov gap = hvF/width Coulomb blockade in graphene Geim, Novoselov; Ensslin group #12;Graphene p

Gabrieli, John

354

Tearing Graphene Sheets From Adhesive Substrates Produces Tapered Nanoribbons  

E-Print Network [OSTI]

Thin films Tearing Graphene Sheets From Adhesive Substrates Produces Tapered Nanoribbons Dipanjan Sen, Kostya S. Novoselov, Pedro M. Reis, and Markus J. Buehler* Graphene is a truly two- film materials have been studied extensively, the key mechanical properties of graphene

Entekhabi, Dara

355

A supersymmetric model for graphene  

E-Print Network [OSTI]

In this work, we focus on the fermionic structure of the low-energy excitations of graphene (a monolayer of carbon atoms) to propose a new supersymmetric field-theoretic model for this physical system. In the current literature, other proposals for describing graphene physics have been contemplated at the level of supersymmetric quantum mechanics. Also, by observing the inhomogeneities between neighbor carbon atoms, Jackiw {\\it et al.} have set up an interesting chiral Abelian gauge theory. We show in this paper that our formulation encompasses models discussed previously as sectors of an actually richer (supersymmetric) planar gauge model. Possible interpretations for the fields involved in the present graphene model are proposed and the question of supersymmetry breaking is discussed.

Everton M. C. Abreu; Marco A. De Andrade; Leonardo P. G. de Assis; Jose A. Helayel-Neto; A. L. M. A. Nogueira; Ricardo C. Paschoal

2010-02-12T23:59:59.000Z

356

The Schwinger mechanism and graphene  

E-Print Network [OSTI]

The Schwinger mechanism, the production of charged particle-antiparticle pairs in a macroscopic external electric field, is derived for 2+1 dimensional theories. The rate of pair production per unit area for four species of massless fermions, with charge $q$, in a constant electric field $E$ is given by $ \\pi^{-2} \\hbar^{-3/2} \\tilde{c}^{-1/2} (q E)^{3/2} $ where $\\tilde{c}$ is the speed of light for the two-dimensional system. To the extent undoped graphene behaves like the quantum field-theoretic vacuum for massless fermions in 2+1 dimensions, the Schwinger mechanism should be testable experimentally. A possible experimental configuration for this is proposed. Effects due to deviations from this idealized picture of graphene are briefly considered. It is argued that with present day samples of graphene, tests of the Schwinger formula may be possible.

Danielle Allor; Thomas D. Cohen; David A. McGady

2007-08-10T23:59:59.000Z

357

Electron Effective Mass in Graphene  

E-Print Network [OSTI]

The particle effective mass in graphene is a challenging concept because the commonly used theoretical expression is mathematically divergent. In this paper, we use basic principles to present a simple theoretical expression for the effective mass that is suitable for both parabolic and non-parabolic isotropic materials. We demonstrate that this definition is consistent with the definition of the cyclotron effective mass, which is one of the common methods for effective mass measurement in solid state materials. We apply the proposed theoretical definition to graphene and demonstrate linear dependence of the effective mass on momentum, as confirmed by experimental cyclotron resonance measurements. Therefore, the proposed definition of the effective mass can be used for non-parabolic materials such as graphene.

Viktor Ariel; Amir Natan

2012-06-26T23:59:59.000Z

358

Physisorption of Nucleobases on Graphene  

E-Print Network [OSTI]

We report the results of our first-principles investigation on the interaction of the nucleobases adenine (A), cytosine (C), guanine (G), thymine (T), and uracil (U) with graphene, carried out within the density functional theory framework, with additional calculations utilizing Hartree--Fock plus second-order Moeller-Plesset perturbation theory. The calculated binding energy of the nucleobases shows the following hierarchy: G > T ~ C ~ A > U, with the equilibrium configuration being very similar for all five of them. Our results clearly demonstrate that the nucleobases exhibit significantly different interaction strengths when physisorbed on graphene. The stabilizing factor in the interaction between the base molecule and graphene sheet is dominated by the molecular polarizability that allows a weakly attractive dispersion force to be induced between them. The present study represents a significant step towards a first-principles understanding of how the base sequence of DNA can affect its interaction with carbon nanotubes, as observed experimentally.

S. Gowtham; Ralph H. Scheicher; Rajeev Ahuja; Ravindra Pandey; Shashi P. Karna

2007-04-11T23:59:59.000Z

359

SolarIsland aka Yinghua Taian Dazheng Hengyuan Solar Technology Co Ltd |  

Open Energy Info (EERE)

SolarIsland aka Yinghua Taian Dazheng Hengyuan Solar Technology Co Ltd SolarIsland aka Yinghua Taian Dazheng Hengyuan Solar Technology Co Ltd Jump to: navigation, search Name SolarIsland (aka Yinghua, Taian Dazheng Hengyuan Solar Technology Co Ltd) Place Nanguan, Shandong Province, China Zip 271000 Sector Solar Product Manufacturer and exporter of solar passive water heating systems and PV-powered solar road lighting, torches and lamps. References SolarIsland (aka Yinghua, Taian Dazheng Hengyuan Solar Technology Co Ltd)[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. SolarIsland (aka Yinghua, Taian Dazheng Hengyuan Solar Technology Co Ltd) is a company located in Nanguan, Shandong Province, China . References ↑ "[ SolarIsland (aka Yinghua, Taian Dazheng Hengyuan Solar

360

Synthesis of graphene oxide nanosheet: A novel glucose sensor based on nickel-graphene oxide composite film  

Science Journals Connector (OSTI)

The graphene oxide (GO) nanosheets were produced by ... IR). An electrochemical sensor based on Ni/graphene (GR) composite film was developed by...2+ into the graphene oxide film modified glassy carbon electrode ...

Fereshteh Chekin; Samira Bagheri

2014-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
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361

Magnetically induced waveguide in graphene  

Science Journals Connector (OSTI)

We show that the magnetically induced waveguide in graphene leads to strong confinement of Dirac fermions, regardless of its edge terminations. The proposed waveguide indeed acts as a ballistic conductor and produces well-localized current density and stepwise increasing conductance. Furthermore, when the waveguide is modulated by a magnetic barrier in a small region, its transport properties are dramatically changed. The conductance now exhibits characteristic oscillatory increases as a function of fermion energy. The results of the modified waveguide may provide the applications of graphene-based transport devices.

Nojoon Myoung; G. Ihm; S. J. Lee

2011-03-28T23:59:59.000Z

362

Cyclotron Resonance in Bilayer Graphene  

Science Journals Connector (OSTI)

We present the first measurements of cyclotron resonance of electrons and holes in bilayer graphene. In magnetic fields up to B=18??T, we observe four distinct intraband transitions in both the conduction and valence bands. The transition energies are roughly linear in B between the lowest Landau levels, whereas they follow B for the higher transitions. This highly unusual behavior represents a change from a parabolic to a linear energy dispersion. The density of states derived from our data generally agrees with the existing lowest order tight binding calculation for bilayer graphene. However, in comparing data to theory, a single set of fitting parameters fails to describe the experimental results.

E. A. Henriksen; Z. Jiang; L.-C. Tung; M. E. Schwartz; M. Takita; Y.-J. Wang; P. Kim; H. L. Stormer

2008-02-27T23:59:59.000Z

363

Nonlinear Elasticity of Monolayer Graphene  

Science Journals Connector (OSTI)

By combining continuum elasticity theory and tight-binding atomistic simulations, we work out the constitutive nonlinear stress-strain relation for graphene stretching elasticity and we calculate all the corresponding nonlinear elastic moduli. Present results represent a robust picture on elastic behavior and provide the proper interpretation of recent experiments. In particular, we discuss the physical meaning of the effective nonlinear elastic modulus there introduced and we predict its value in good agreement with available data. Finally, a hyperelastic softening behavior is observed and discussed, so determining the failure properties of graphene.

Emiliano Cadelano; Pier Luca Palla; Stefano Giordano; Luciano Colombo

2009-06-11T23:59:59.000Z

364

Domain Walls in Gapped Graphene  

Science Journals Connector (OSTI)

The electronic properties of a particular class of domain walls in gapped graphene are investigated. We show that they can support midgap states which are localized in the vicinity of the domain wall and propagate along its length. With a finite density of domain walls, these states can alter the electronic properties of gapped graphene significantly. If the midgap band is partially filled, the domain wall can behave like a one-dimensional metal embedded in a semiconductor and could potentially be used as a single-channel quantum wire.

G. W. Semenoff; V. Semenoff; Fei Zhou

2008-08-21T23:59:59.000Z

365

Periodic ripples in suspended graphene  

Science Journals Connector (OSTI)

We study the mechanism of wrinkling of suspended graphene, by means of atomistic simulations. We argue that the structural instability under edge compression is the essential physical reason for the formation of periodic ripples in graphene. The ripple wavelength and out-of-plane amplitude are found to obey 1/4-power scaling laws with respect to edge compression. Our results also show that parallel displacement of the clamped boundaries can induce periodic ripples, with oscillation amplitude roughly proportional to the 1/4 power of edge displacement.

Zhao Wang and Michel Devel

2011-03-23T23:59:59.000Z

366

San Clemente Island Wind Farm | Open Energy Information  

Open Energy Info (EERE)

San Clemente Island Wind Farm San Clemente Island Wind Farm Jump to: navigation, search Name San Clemente Island Wind Farm Facility San Clemente Island Sector Wind energy Facility Type Community Wind Facility Status In Service Owner U.S. Navy Developer Pacific Industrial Electric Energy Purchaser U.S. Navy Location San Clemente Island CA Coordinates 32.986095°, -118.552138° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":32.986095,"lon":-118.552138,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

367

Strain Effects on Electrical Properties of Suspended Graphene.  

E-Print Network [OSTI]

?? Graphene is an extraordinary material which shows tremendous potential as a replacement for silicon in many electronic applications. However, one major drawback to graphene (more)

Smith, Anderson David

2011-01-01T23:59:59.000Z

368

From Laboratory to Industry: Unlocking the Potential of Graphene...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Materials Return to Search From Laboratory to Industry: Unlocking the Potential of Graphene Brookhaven Lab and Graphene Laboratories collaborate to bring atom-thin material to...

369

Nitrogen-Doped Graphene and its Application in Electrochemical...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Doped Graphene and its Application in Electrochemical Biosensing. Nitrogen-Doped Graphene and its Application in Electrochemical Biosensing. Abstract: Chemical doping with foreign...

370

Elucidating graphene - Ionic Liquid interfacial region: a combined...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

graphene - Ionic Liquid interfacial region: a combined experimental and computational study. Elucidating graphene - Ionic Liquid interfacial region: a combined experimental and...

371

Graphene-assisted control of coupling between optical waveguides  

Science Journals Connector (OSTI)

The unique properties of optical waveguides electrically controlled by means of graphene layers are investigated. We demonstrate that, thanks to tunable losses induced by graphene...

Locatelli, Andrea; Capobianco, Antonio-Daniele; Midrio, Michele; Boscolo, Stefano; De Angelis, Costantino

2012-01-01T23:59:59.000Z

372

Sandia National Laboratories: Three-Dimensional Graphene Architectures  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ClimateECResearch & CapabilitiesCapabilitiesThree-Dimensional Graphene Architectures Three-Dimensional Graphene Architectures Jerry Simmons Is One of Three Researchers Named as...

373

Graphene-Polypyrrole Nanocomposite as a Highly Efficient and...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Graphene-Polypyrrole Nanocomposite as a Highly Efficient and Low Cost Electrically Switched Ion Exchanger for Removing ClO4- Graphene-Polypyrrole Nanocomposite as a Highly...

374

A Prototype for Graphene Material Simulation: Structures and...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Prototype for Graphene Material Simulation: Structures and Interaction Potentials ofCoronene Dimers. A Prototype for Graphene Material Simulation: Structures and Interaction...

375

Constraint of DNA on Functionalized Graphene Improves Its Biostability...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Constraint of DNA on Functionalized Graphene Improves Its Biostability and Specificity. Constraint of DNA on Functionalized Graphene Improves Its Biostability and Specificity....

376

Modification of Defect Structures in Graphene by Electron Irradiation...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Modification of Defect Structures in Graphene by Electron Irradiation: Ab Initio Molecular Dynamics Simulations. Modification of Defect Structures in Graphene by Electron...

377

Functionalized Graphene Sheets as Molecular Templates for Controlled...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

as Molecular Templates for Controlled Nucleation and Self-Assembly of Metal Oxide-Graphene Functionalized Graphene Sheets as Molecular Templates for Controlled Nucleation and...

378

A graphene-based electrochemical sensor for sensitive detection...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

graphene-based electrochemical sensor for sensitive detection of paracetamol . A graphene-based electrochemical sensor for sensitive detection of paracetamol . Abstract: An...

379

Graphene Device Fabrication and Applications in Communication Systems.  

E-Print Network [OSTI]

??High carrier mobility, saturation velocity and thermal conductivity make graphene a promising material for high-frequency, analog and communication applications. The ambipolar properties of graphene provide (more)

Liu, Guanxiong

2012-01-01T23:59:59.000Z

380

Crown Ethers in Graphene Bring Strong, Selective Binding | ornl...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Materials Characterization Crown Ethers in Graphene Bring Strong, Selective Binding November 14, 2014 Schematic showing a graphene sheet containing an array of ideal crown ethers....

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Novel Electronic and Magnetic Properties of Graphene Nanoflakes...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Electronic and Magnetic Properties of Graphene Nanoflakes in a Boron Nitride Layer. Novel Electronic and Magnetic Properties of Graphene Nanoflakes in a Boron Nitride Layer....

382

Nitrogen-doped Graphene and Its Electrochemical Applications  

SciTech Connect (OSTI)

Nitrogen-doped graphene (N-graphene) is obtained by exposing graphene to nitrogen plasma. N-graphene exhibits much higher electrocatalytic activity toward oxygen reduction and H2O2 reduction than graphene, and much higher durability and selectivity than the widely-used expensive Pt. The excellent electrochemical performance of N-graphene is attributed to nitrogen functional groups and the specific properties of graphene. This indicates that N-graphene is promising for applications in electrochemical energy devices (fuel cells, metal-air batteries) and biosensors.

Shao, Yuyan; Zhang, Sheng; Engelhard, Mark H.; Li, Guosheng; Shao, Guocheng; Wang, Yong; Liu, Jun; Aksay, Ilhan A.; Lin, Yuehe

2010-06-04T23:59:59.000Z

383

Energetics of Defects on Graphene through Fluorination. | EMSL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Defects on Graphene through Fluorination. Energetics of Defects on Graphene through Fluorination. Abstract: In the present study, we used FGS5 as the substrate and implemented...

384

Flexible Pillared Graphene-Paper Electrodes for High-Performance...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Flexible Pillared Graphene-Paper Electrodes for High-Performance Electrochemical Supercapacitors. Flexible Pillared Graphene-Paper Electrodes for High-Performance Electrochemical...

385

Glucose oxidase-graphene-chitosan modified electrode for direct...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

oxidase-graphene-chitosan modified electrode for direct electrochemistry and glucose sensing. Glucose oxidase-graphene-chitosan modified electrode for direct electrochemistry and...

386

Hydrogenated Graphene Nanoflakes: Semiconductor to Half-Metal...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Hydrogenated Graphene Nanoflakes: Semiconductor to Half-Metal Transition and Remarkable Large Magnetism. Hydrogenated Graphene Nanoflakes: Semiconductor to Half-Metal Transition...

387

Improved Electrical Conductivity of Graphene Films Integrated with Metal Nanowires  

E-Print Network [OSTI]

tin oxide films in electrochromic (EC) devices. The successful integration of such graphene/NW films. KEYWORDS: Graphene, nanowires, transparent conductive films, electrochromic devices Due to low electron

388

Graphene/metal Oxide Nanocomposites for Li-ion Batteries  

Science Journals Connector (OSTI)

Our work focuses on preparing the graphene/metal oxide nanocomposites by facile methold and exploring the graphene/metal oxide composites with unique structural or compositions for...

Liang, Junfei; Li, Lidong; Guo, Lin

389

Journal Article: Graphene physics and insulator-metal transition...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Graphene physics and insulator-metal transition in compressed hydrogen Citation Details Title: Graphene physics and insulator-metal transition in compressed hydrogen Authors:...

390

Journal Article: Stability of edge states in strained graphene...  

Office of Scientific and Technical Information (OSTI)

Publisher's Accepted Manuscript: Stability of edge states in strained graphene Citation Details Title: Stability of edge states in strained graphene Authors: Ghaemi, Pouyan;...

391

Crown Ethers Flatten in Graphene for Strong, Specific Binding...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Crown Ethers Flatten in Graphene for Strong, Specific Binding ORNL discovery holds potential for separations, sensors, batteries, biotech and more This sheet of graphene contains...

392

In the OSTI Collections: Graphene | OSTI, US Dept of Energy,...  

Office of Scientific and Technical Information (OSTI)

for graphene applications. Some of these applications involve how graphene conducts electricity (i.e., how electrons flow along the plane) and how it interacts with light....

393

Desorption Kinetics of Methanol, Ethanol, and Water from Graphene...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Desorption Kinetics of Methanol, Ethanol, and Water from Graphene. Desorption Kinetics of Methanol, Ethanol, and Water from Graphene. Abstract: The desorption kinetics of methanol,...

394

Graphene oxide/poly(acrylic acid) hydrogel by ?-ray pre-irradiation on graphene oxide surface  

Science Journals Connector (OSTI)

Graphene oxide/poly(acrylic acid) (GO/PAA)...?...-ray pre-irradiation technique. The functional groups in graphene oxide were modified to peroxide in an...2 environment with ?...-ray radiation. Radical species fr...

Sungyoung Lee; Hoik Lee; Jae Hyun Sim; Daewon Sohn

2014-02-01T23:59:59.000Z

395

Graphene for reducing bubble defects and enhancing mechanical properties of graphene/cellulose acetate composite films  

Science Journals Connector (OSTI)

In this study, we have demonstrated a strategy by which graphene was used to reduce the bubble defects and enhance the mechanical properties in graphene/cellulose acetate (Gr/CA) composite films. Mono- and multil...

Lei Liu; Zhigang Shen; Shuaishuai Liang; Min Yi

2014-01-01T23:59:59.000Z

396

Synthesis and characterizations of graphene oxide and reduced graphene oxide nanosheets  

SciTech Connect (OSTI)

Interest in graphene on its excellent mechanical, electrical, thermal and optical properties, its very high specific surface area, and our ability to influence these properties through chemical functionalization. Chemical reduction of graphene oxide is one of the main routes of preparation for large quantities of graphenes. Hydrazine hydrate used as reducing agent to prepare for the reduced graphene oxide (RGO). There are a number of methods for generating graphene and chemically modified graphene from natural graphite flakes, graphite derivative (such as graphite oxide) and graphite interaction compounds (i.e. expandable graphite). Here we review the use of colloidal suspensions of reduced graphene oxide (RGO) with large scalable, and is adaptable to a wide variety of applications. The graphene oxide (GO) and the reduced material (RGO) were characterized by XRD, UV-Vis spectroscopy, Thermo-gravimetric analysis (TGA), Raman spectroscopy and Field emission Scanning electron microscopy (FESEM) etc.

Venkanna, M., E-mail: venkanna.pcu@gmail.com; Chakraborty, Amit K., E-mail: venkanna.pcu@gmail.com [Carbon Nanotechnology Laboratory, Department of Physics, National Institute of Technology Durgapur, M.G. Avenue, Durgapur - 713209 (India)

2014-04-24T23:59:59.000Z

397

Formation of graphene quantum dots by Planting hydrogen atoms at a graphene nanoribbon  

Science Journals Connector (OSTI)

Different technological approaches for creating graphene quantum dots by the adsorption of hydrogen ... occur both at convex portions of a distorted graphene nanoribbon and in the structure formed by two distorte...

L. A. Chernozatonskii; A. A. Artyukh; D. G. Kvashnin

2012-05-01T23:59:59.000Z

398

Galveston Island and erosion  

E-Print Network [OSTI]

GALVESTON ISLAND AND EROSION A Thesis by JIM MASON BOLLETER Approved as to styIe and content by: . R. Benton (Chairman of Com sttee) Rooert E. Randa (Member) hris opher . Mathewson (Member) Dona d M1cDona d (Head of Department) May 1985... of the seawal 1, a reduced longshore sediment supply from the Mississippi River and, possibly, accelerated sea-level rise. ACKNOWLEDGEMENTS This thesis is the end result of a study funded by the Sea Grant College Program of the National Dceanic...

Bolleter, Jim Mason

2012-06-07T23:59:59.000Z

399

Islands in the landscape  

E-Print Network [OSTI]

The string theory landscape consists of many metastable de Sitter vacua, populated by eternal inflation. Tunneling between these vacua gives rise to a dynamical system, which asymptotically settles down to an equilibrium state. We investigate the effects of sinks to anti-de Sitter space, and show how their existence can change probabilities in the landscape. Sinks can disturb the thermal occupation numbers that would otherwise exist in the landscape and may cause regions that were previously in thermal contact to be divided into separate, thermally isolated islands.

T. Clifton; Andrei Linde; Navin Sivanandam

2007-01-10T23:59:59.000Z

400

Effects of Marsh Terracing on Nekton Abundance at Two Locations in Galveston Bay, Texas  

E-Print Network [OSTI]

ARTICLE Effects of Marsh Terracing on Nekton Abundance at Two Locations in Galveston Bay, Texas Joy Bay, Texas were constructed June to October 1999 at Galveston Island State Park (GI) and Pierce Marsh evaluated two marsh terracing restoration projects (GI=Galveston Island State Park, PM=Pierce Marsh

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Thematic Review Conservation of Biodiversity on Islands  

E-Print Network [OSTI]

Thematic Review Conservation of Biodiversity on Islands: The contribution of the United Kingdom............................................................................................. 11 3. THE BIODIVERSITY OF ISLANDS INVOLVED WITH DI PROJECTS ........................................................................................... 49 6. THE DARWIN INITIATIVE'S CONTRIBUTION TO THE CBD'S ISLAND BIODIVERSITY PROGRAMME OF WORK

402

Electromagnetic waves reflection, transmission and absorption by graphene - magnetic semiconductor - graphene sandwich-structure in magnetic field: Faraday geometry  

E-Print Network [OSTI]

Electrodynamic properties of the graphene - magnetic semiconductor - graphene sandwich-structure have been investigated theoretically with taking into account the dissipation processes. Influence of graphene layers on electromagnetic waves propagation in graphene - semi-infinte magnetic semiconductor and graphene - magnetic semiconductor - graphene sandwich-structure has been analyzed. Frequency and field dependences of the reflectance, transmittance and absorbtance of electromagnetic waves by such structure have been calculated. The size effects associated with the thickness of the structure have been analyzed. The possibility of efficient control of electrodynamic properties of graphene - magnetic semiconductor - graphene sandwich structure by an external magnetic field has been shown.

Kuzmin, Dmitry A; Shavrov, Vladimir G

2014-01-01T23:59:59.000Z

403

An ab initio study on gas sensing properties of graphene and Si-doped graphene  

Science Journals Connector (OSTI)

...In order to exploit the potential applications of graphene as gas sensors, the adsorptions of a...2, NO2 and H2O) on pristine graphene (PG) and Si-doped graphene (SiG) have been investigated by ab...2 and NO2 ...

Y. Zou; F. Li; Z. H. Zhu; M. W. Zhao; X. G. Xu; X. Y. Su

2011-06-01T23:59:59.000Z

404

Tunneling characteristics in chemical vapor deposited graphene hexagonal boron nitride graphene junctions  

E-Print Network [OSTI]

1 Tunneling characteristics in chemical vapor deposited graphene ­ hexagonal boron nitride ­ graphene junctions T. Roy1 , L. Liu2 , S. de la Barrera,3 B. Chakrabarti1,4 , Z. R. Hesabi1 , C. A. Joiner1 Abstract: Large area chemical vapor deposited graphene and hexagonal boron nitride was used to fabricate

Feenstra, Randall

405

Probing the electronic structure and optical response of a graphene quantum disk supported on monolayer graphene  

E-Print Network [OSTI]

Probing the electronic structure and optical response of a graphene quantum disk supported on monolayer graphene This article has been downloaded from IOPscience. Please scroll down to see the full text.1088/0953-8984/24/31/314213 Probing the electronic structure and optical response of a graphene quantum disk supported on monolayer

Pennycook, Steve

406

Atomic and electronic structure of simple metal/graphene and complex metal/graphene/metal interfaces  

Science Journals Connector (OSTI)

Structural, electronic, and magnetic properties of simple interfaces (graphene on top of a metallic substrate) and complex interfaces (a single metallic adlayer on a simple graphene/metal system, either on top or between the graphene and metallic substrate) have been studied using density functional theory. Two types of simple interface with strong (Ni/graphene) and weak (Cu/graphene) bonding were considered. In addition to binding energies and interface distances, which are used to quantify the strength of graphene-substrate interactions, the bonding in simple and complex interfaces was analyzed using charge density distributions and bond orders. Substantial enhancement of the metallic substrate/graphene binding was observed in complex interfaces, consisting of a Ni monolayer on top of a simple {Ni or Cu}/graphene interface. The increase of substrate-graphene bonding in such complex interfaces is accompanied by weakening of in-plane C-C bonds in graphene, as quantified by the bond orders. A weak ferrimagnetism in graphene, i.e., unequal magnetic moments ?0.04?B and +0.06?B on the C atoms, is induced by a ferromagnetic Ni substrate. The strength of graphene-substrate interactions is also reflected in simulated scanning tunneling microscopy images.

Lyudmyla Adamska; You Lin; Andrew J. Ross; Matthias Batzill; Ivan I. Oleynik

2012-05-22T23:59:59.000Z

407

Sensitivity analysis of single-layer graphene resonators using atomic finite element method  

SciTech Connect (OSTI)

Atomic finite element simulation is applied to study the natural frequency and sensitivity of a single-layer graphene-based resonator with CCCC, SSSS, CFCF, SFSF, and CFCF boundary conditions using the commercial code ANSYS. The fundamental frequencies of the graphene sheet are compared with the results of the previous finite element study. In addition, the sensitivity of the resonator is compared with the early work based on nonlocal elasticity theory. The results of the comparison are very good in all considered cases. The sensitivities of the resonator with different boundary conditions are obtained, and the order based on the boundary condition is CCCC > SSSS > CFCF > SFSF > CFFF. The highest sensitivity is obtained when the attached mass is located at the center of the resonator. This is useful for the design of a highly sensitive graphene-based mass sensor.

Lee, Haw-Long; Hsu, Jung-Chang; Lin, Shu-Yu; Chang, Win-Jin [Department of Mechanical Engineering, Kun Shan University, Tainan 71003, Taiwan (China)] [Department of Mechanical Engineering, Kun Shan University, Tainan 71003, Taiwan (China)

2013-09-28T23:59:59.000Z

408

On Klein tunneling in graphene  

Science Journals Connector (OSTI)

The essential features of Klein tunneling of massless fermions in graphene may be treated in one dimension without the need for Dirac spinors. Two dimensions needs a spinor treatment and is investigated numerically which lets us compare tunneling through smooth potential barriers with that through idealized step potentials.

T. R. Robinson

2012-01-01T23:59:59.000Z

409

Graphene tests of Klein phenomena  

E-Print Network [OSTI]

Graphene is characterized by chiral electronic excitations. As such it provides a perfect testing ground for the production of Klein pairs (electron/holes). If confirmed, the standard results for barrier phenomena must be reconsidered with, as a byproduct, the accumulation within the barrier of holes.

Stefano De Leo; Pietro Rotelli

2012-02-07T23:59:59.000Z

410

Electronic properties of epitaxial graphene  

Science Journals Connector (OSTI)

It has been known for almost 25 years that high temperature treatment of polar faces of SiC crystals lead to the graphitisation of the surface as a consequence of Si preferential sublimation. The group of Walt de Heer in Atlanta has proposed to use this procedure to obtain macroscopic multilayer graphene samples. This has lead to a renewal of interest for the study of the graphitic layers grown on the SiC surfaces. Due to the polar nature of the material, the 6H(4H)-SiC substrate present two non-equivalent surfaces: the (0001) is known as the Si face, and the (000-1) one is the C face. It turns out that the structure and the properties of the multilayer graphene samples obtained on those two surfaces are rather different. In particular the multilayer graphene samples grown on the C-terminated face presents electronic properties that are rather similar to those of monolayer graphene with very high mobility. This is shown by transport and optical experiments under high magnetic field. This surprising result is explained by the rotational stacking sequence, observed experimentally, which leads to an electronic decoupling as demonstrated by ab initio band structure calculations.

Claire Berger; Jean-Yves Veuillen; Laurence Magaud; Pierre Mallet; Valerio Olevano; M. Orlita; P. Plochocka; C. Faugeras; G. Martinez; Marek Potemski; Cecile Naud; Laurent P. Levy; Didier Mayou

2010-01-01T23:59:59.000Z

411

MHK Projects/Vidal Island | Open Energy Information  

Open Energy Info (EERE)

Vidal Island Vidal Island < MHK Projects Jump to: navigation, search << Return to the MHK database homepage Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":5,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"500px","height":"350px","centre":false,"title":"","label":"","icon":"File:Aquamarine-marker.png","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[]}

412

Library Locations Locations other than Main Library  

E-Print Network [OSTI]

Library Locations Locations other than Main Library Example: Feminist Studies HQ1410 .U54 2009 University of California, Santa Barbara Library www.library.ucsb.edu Updated 3-2014 A - B.......................................6 Central M - N..................................................Arts Library (Music Building) P

413

STANDARD OPERATING PROCEDURE Location(s): ___________________________________________________  

E-Print Network [OSTI]

of as hazardous waste. 8. Decontamination: Specific instructions: For light contamination of small areas or items12.1 STANDARD OPERATING PROCEDURE for PHENOL Location(s): ___________________________________________________ Chemical(s): Phenol Specific Hazards: May be fatal if inhaled. Harmful if absorbed through skin. Harmful

Pawlowski, Wojtek

414

Mechanism for puddle formation in graphene  

Science Journals Connector (OSTI)

When graphene is close to charge neutrality, its energy landscape is highly inhomogeneous, forming a sea of electron-like and hole-like puddles that determine the properties of graphene at low carrier density. However, the details of the puddle formation have remained elusive. We demonstrate numerically that in sharp contrast to monolayer graphene, the normalized autocorrelation function for the puddle landscape in bilayer graphene depends only on the distance between the graphene and the source of the long-ranged impurity potential. By comparing with available experimental data, we find quantitative evidence for the implied differences in scanning tunneling microscopy measurements of electron and hole puddles for monolayer and bilayer graphene in nominally the same disorder potential.

S. Adam; Suyong Jung; Nikolai N. Klimov; Nikolai B. Zhitenev; Joseph A. Stroscio; M. D. Stiles

2011-12-05T23:59:59.000Z

415

Fabrication of Li-intercalated bilayer graphene  

Science Journals Connector (OSTI)

We have succeeded in fabricating Li-intercalated bilayer graphene on silicon carbide. The low-energy electron diffraction from Li-deposited bilayer graphene shows a sharp 3 3 R 30 pattern in contrast to Li-deposited monolayer graphene. This indicates that Li atoms are intercalated between two adjacent graphene layers and take the same well-ordered superstructure as in bulk C6Li. The angle-resolved photoemission spectroscopy has revealed that Li atoms are fully ionized and the ? bands of graphene are systematically folded by the superstructure of intercalated Li atoms producing a snowflake-like Fermi surface centered at the ? point. The present result suggests a high potential of Li-intercalated bilayer graphene for application to a nano-scale Li-ion battery.

K. Sugawara; K. Kanetani; T. Sato; T. Takahashi

2011-01-01T23:59:59.000Z

416

Size-dependent mobility of gold nano-clusters during growth on chemically modified graphene  

SciTech Connect (OSTI)

Gold nano-clusters were grown on chemically modified graphene by direct sputter deposition. Transmission electron microscopy of the nano-clusters on these electron-transparent substrates reveals an unusual bimodal island size distribution (ISD). A kinetic Monte Carlo model of growth incorporating a size-dependent cluster mobility rule uniquely reproduces the bimodal ISD, providing strong evidence for the mobility of large clusters during surface growth. The cluster mobility exponent of ?5/3 is consistent with cluster motion via one-dimensional diffusion of gold atoms around the edges of the nano-clusters.

Bell, Gavin R., E-mail: gavin.bell@warwick.ac.uk; Dawson, Peter M.; Pandey, Priyanka A.; Wilson, Neil R. [Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom); Mulheran, Paul A. [Department of Chemical and Process Engineering, University of Strathclyde, James Weir Building, 75 Montrose St., Glasgow G1 1XJ (United Kingdom)

2014-01-01T23:59:59.000Z

417

Small-Scale Solar Grants (Rhode Island)  

Broader source: Energy.gov [DOE]

The Rhode Island Economic Development Corporation (RIEDC) provides incentives for renewable-energy projects. Incentive programs are funded by the Rhode Island Renewable Energy Fund (RIREF) and...

418

Hainan Green Islands Power | Open Energy Information  

Open Energy Info (EERE)

Green Islands Power Jump to: navigation, search Name: Hainan Green Islands Power Place: Hainan Province, China Sector: Solar Product: China-based JV developing on-grid solar...

419

Bainbridge Island Data Dashboard | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Data Dashboard Bainbridge Island Data Dashboard The data dashboard for Bainbridge Island, a partner in the U.S. Department of Energy's Better Buildings Neighborhood Program....

420

Epitaxial graphene films on SiC: growth, characterization, and devices.  

E-Print Network [OSTI]

??Graphene is a single sheet of graphite. While bulk graphite is semimetal, graphene is a zero bandgap semiconductor. Band structure calculations show graphene has a (more)

Li, Xuebin

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Graphene saturable absorber for Q-switching and mode locking at 2 ?m wavelength [Invited  

Science Journals Connector (OSTI)

Graphene saturable absorber mirror (SAM) was successfully fabricated by transferring large-size graphene flake on dielectric coating mirror. The graphene transferred on the mirror was...

Xie, G Q; Ma, J; Lv, P; Gao, W L; Yuan, P; Qian, L J; Yu, H H; Zhang, H J; Wang, J Y; Tang, D Y

2012-01-01T23:59:59.000Z

422

Graphene enhanced evanescent field in microfiber multimode interferometer for highly sensitive gas sensing  

Science Journals Connector (OSTI)

Graphene based new physics phenomena are leading to a variety of stimulating graphene-based photonic devices. In this study, the enhancement of surface evanescent field by graphene...

Yao, B C; Wu, Y; Zhang, A Q; Rao, Y J; Wang, Z G; Cheng, Y; Gong, Y; Zhang, W L; Chen, Y F; Chiang, K S

2014-01-01T23:59:59.000Z

423

Graphene-based tunable hyperbolic metamaterials and enhanced near-field absorption.  

E-Print Network [OSTI]

and M. Hanbucken, A graphene electron lens, Appl. Phys.based on plasmonic resonant graphene sheets, J. Appl. Phys.polaritons in monolayer graphene sheet arrays, Phys. Rev.

Othman, Mohamed A K; Guclu, Caner; Capolino, Filippo

2013-01-01T23:59:59.000Z

424

Effects of Marsh Terracing on Nekton Abundance at Two Locations in Galveston Bay, Texas  

Science Journals Connector (OSTI)

We evaluated two marsh terracing restoration projects (GI=Galveston Island State Park, PM=Pierce Marsh) to compare nekton density and biomass between locations and among habitat types (open water pre-construct...

Joy H. Merino; Lawrence P. Rozas; Thomas J. Minello; Peter F. Sheridan

2010-08-01T23:59:59.000Z

425

Field-induced confined states in graphene  

SciTech Connect (OSTI)

We report an approach to confine the carriers in single-layer graphene, which leads to quantum devices with field-induced quantum confinement. We demonstrated that the Coulomb-blockade effect evolves under a uniform magnetic field perpendicular to the graphene device. Our experimental results show that field-induced quantum dots are realized in graphene, and a quantum confinement-deconfinement transition is switched by the magnetic field.

Moriyama, Satoshi, E-mail: MORIYAMA.Satoshi@nims.go.jp [International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Morita, Yoshifumi [Faculty of Engineering, Gunma University, Kiryu, Gunma 376-8515 (Japan); Watanabe, Eiichiro; Tsuya, Daiju [Nanotechnology Innovation Station, NIMS, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan)

2014-02-03T23:59:59.000Z

426

Ordered states of adatoms on graphene  

Science Journals Connector (OSTI)

We show that a dilute ensemble of epoxy-bonded adatoms on graphene has a tendency to form a spatially correlated state accompanied by a gap in graphenes electron spectrum. This effect emerges from the electron-mediated interaction between adatoms with a peculiar 1/r3 distance dependence. The partial ordering transition is described by a random bond three-state Potts model.

Vadim V. Cheianov; Olav Syljusen; B. L. Altshuler; Vladimir Falko

2009-12-30T23:59:59.000Z

427

Electrostatic force assisted deposition of graphene  

DOE Patents [OSTI]

An embodiment of a method of depositing graphene includes bringing a stamp into contact with a substrate over a contact area. The stamp has at least a few layers of the graphene covering the contact area. An electric field is developed over the contact area. The stamp is removed from the vicinity of the substrate which leaves at least a layer of the graphene substantially covering the contact area.

Liang, Xiaogan (Berkeley, CA)

2011-11-15T23:59:59.000Z

428

How Bilayer Graphene Got a Bandgap  

ScienceCinema (OSTI)

Graphene is the two-dimensional crystalline form of carbon, whose extraordinary electron mobility and other unique features hold great promise for nanoscale electronics and photonics. But theres a catch: graphene has no bandgap. Now Feng Wang and his colleagues at Berkeley Lab and UC Berkeley have engineered a bandgap in bilayer graphene that can be precisely controlled from 0 to 250 milli-electron volts, which is the energy of infrared radiation.

Feng Wang

2010-01-08T23:59:59.000Z

429

How Bilayer Graphene Got a Bandgap  

SciTech Connect (OSTI)

Graphene is the two-dimensional crystalline form of carbon, whose extraordinary electron mobility and other unique features hold great promise for nanoscale electronics and photonics. But theres a catch: graphene has no bandgap. Now Feng Wang and his colleagues at Berkeley Lab and UC Berkeley have engineered a bandgap in bilayer graphene that can be precisely controlled from 0 to 250 milli-electron volts, which is the energy of infrared radiation.

Feng Wang

2009-06-02T23:59:59.000Z

430

How Bilayer Graphene Got a Bandgap  

ScienceCinema (OSTI)

Graphene is the two-dimensional crystalline form of carbon, whose extraordinary electron mobility and other unique features hold great promise for nanoscale electronics and photonics. But theres a catch: graphene has no bandgap. Now Feng Wang and his colleagues at Berkeley Lab and UC Berkeley have engineered a bandgap in bilayer graphene that can be precisely controlled from 0 to 250 milli-electron volts, which is the energy of infrared radiation.

Wang, Feng

2013-05-29T23:59:59.000Z

431

Limits on Intrinsic Magnetism in Graphene  

Science Journals Connector (OSTI)

We have studied magnetization of graphene nanocrystals obtained by sonic exfoliation of graphite. No ferromagnetism is detected at any temperature down to 2K. Neither do we find strong paramagnetism expected due to the massive amount of edge defects. Rather, graphene is strongly diamagnetic, similar to graphite. Our nanocrystals exhibit only a weak paramagnetic contribution noticeable below 50K. The measurements yield a single species of defects responsible for the paramagnetism, with approximately one magnetic moment per typical graphene crystallite.

M. Sepioni; R. R. Nair; S. Rablen; J. Narayanan; F. Tuna; R. Winpenny; A. K. Geim; I. V. Grigorieva

2010-11-12T23:59:59.000Z

432

CC locator map  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Ellenton Aiken 19 W h i s k e y R d 302 302 278 278 278 125 125 125 A 1 Barnwell 278 Williston Bush Field to I-20 & Columbia 1 1 78 Beech Island U p p e r T h r e e R u n s C r e...

433

Graphene: A New Era of Technology  

E-Print Network [OSTI]

Abstract The aim of this literature indicate that graphene composites are promising multifunctional materials with improved tensile strength and elastic modulus, mechanical strength, optical property, electrical and thermal conductivity. Its unique quality light weight, high strength, excellent electric conductivity makes it differ from any other material. It has ability to replace the silicon and change the scenario of semiconductor devices. It is a base of nano technology. Due to its unique properties, it will sets the new dimension in the nano techno world. Keywords Molybdenum-disulphide (MoS 2), chemically reduced graphene oxide (CRGO), indium tin oxide (ITO), graphene oxide (GO), thermally reduce graphene oxide (TRGO) I.

Ankita Dixit; Divya Dixit; Vidhi Vart Ch; Ashok Kajla

434

Electrical and Thermoelectrical Transport Properties of Graphene.  

E-Print Network [OSTI]

??Graphene is a newly discovered material. It has many excellent properties, which make the research of this new material very important not only for the (more)

Wang, Deqi

2011-01-01T23:59:59.000Z

435

Graphene-based polymer waveguide polarizer  

Science Journals Connector (OSTI)

Planar-lightwave-circuit (PLC)-type graphene polarizers are fabricated by using a low loss optical polymer waveguide. The optical characteristics are investigated at a wavelength of...

Kim, Jin Tae; Choi, Choon-Gi

2012-01-01T23:59:59.000Z

436

Chemistry at the Dirac Point of Graphene.  

E-Print Network [OSTI]

??Graphene holds great potential as an electronic material because of its excellent transport properties, which derive from its unique Fermi surface and ballistic conductance. It (more)

Sarkar, Santanu

2013-01-01T23:59:59.000Z

437

Orderly Deposition of Uncontaminated Graphene - Energy Innovation...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Orderly Deposition of Uncontaminated Graphene Lawrence Berkeley National Laboratory Contact LBL About This Technology Technology Marketing SummaryXiaogan Liang of Berkeley Lab has...

438

First Observation of Plasmarons in Graphene  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

First Observation of Plasmarons in Graphene Print An international team of scientists performing angle-resolved photoemission spectroscopy (ARPES) experiments at ALS Beamline 7.0.1...

439

Silicon-Graphene Anodes | Argonne National Laboratory  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Silicon-Graphene Anodes Technology available for licensing: Provides low-cost production process. Advanced gas phase deposition process yields anodes with five times the specific...

440

Tunable Dirac Magneto-Plasmons in Graphene  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and may allow much faster transmission of information than conventional electronics. Graphene is emerging as a very promising plasmonic material because its plasmonic frequency is...

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Graphene as Gain Medium for Broadband Lasers  

E-Print Network [OSTI]

In contrast to conventional structures, efficient non-radiative carrier recombination counteracts the appearance of optical gain in graphene. Based on a microscopic and fully quantum-mechanical study of the coupled carrier, phonon, and photon dynamics in graphene, we present a strategy to obtain a long-lived gain: Integrating graphene into a photonic crystal nanocavity and applying a high-dielectric substrate gives rise to pronounced coherent light emission suggesting the design of graphene-based laser devices covering a broad spectral range.

Jago, Roland; Knorr, Andreas; Malic, Ermin

2014-01-01T23:59:59.000Z

442

Molecular architecture and functionalization of graphene surface...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Molecular architecture and functionalization of graphene surface; Synthesis and characterization Wednesday, November 12, 2014 - 3:00pm SLAC, Redtail Hawk Conference Room 108A...

443

Multiple Layer Graphene Optical Modulator - Energy Innovation...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Materials Advanced Materials Find More Like This Return to Search Multiple Layer Graphene Optical Modulator Lawrence Berkeley National Laboratory Contact LBL About This...

444

Imperfect graphene renders 'electrical highways' > Archived News...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

method invented In This Section EMC2 News Archived News Stories Imperfect graphene renders 'electrical highways' July 11th, 2013 By Anne Ju Muller lab: Three dark...

445

Functionalized Graphene Nanoroads for Quantum Well Device. |...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nanoroads for Quantum Well Device. Functionalized Graphene Nanoroads for Quantum Well Device. Abstract: Using density functional theory, a series of calculations of structural and...

446

Electrostatic Graphene Loudspeaker - Energy Innovation Portal  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Materials Advanced Materials Find More Like This Return to Search Electrostatic Graphene Loudspeaker Lawrence Berkeley National Laboratory Contact LBL About This Technology...

447

Tunable Graphene Electronic Devices - Energy Innovation Portal  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Advanced Materials Advanced Materials Find More Like This Return to Search Tunable Graphene Electronic Devices Lawrence Berkeley National Laboratory Contact LBL About This...

448

Electronic and Spintronic Properties of Graphene.  

E-Print Network [OSTI]

??In this thesis, I summarize our studies investigating the electronic properties and spintronic properties of transition metal doped graphene over the last six years. In (more)

Pi, Keyu

2010-01-01T23:59:59.000Z

449

Controlled synthesis of single-crystalline graphene  

SciTech Connect (OSTI)

This paper reports the controlled synthesis of single-crystalline graphene on the back side of copper foil using CH{sub 4} as the precursor. The influence of growth time and the pressure ratio of CH{sub 4}/H{sub 2} on the structure of graphene are examined. An optimized polymer-assisted method is used to transfer the synthesized graphene onto a SiO{sub 2}/Si substrate. Scanning electron microscopy and Raman spectroscopy are used to characterize the graphene.

Xueshen, Wang, E-mail: wangxs@nim.ac.cn; Jinjin, Li, E-mail: jinjinli@nim.ac.cn; Qing, Zhong; Yuan, Zhong; Mengke, Zhao; Yonggang, Liu [National Institute of Metrology, Beijing, China, 100013 (China)] [National Institute of Metrology, Beijing, China, 100013 (China)

2014-03-15T23:59:59.000Z

450

Optical Transitions in Monolayer and Bilayer Graphene  

Science Journals Connector (OSTI)

Optical transitions in grapheme are studied by infrared spectroscopy. The interband transitions in graphene monolayers show a relatively flat spectrum, while those in bilayers are...

Wang, Feng; Zhang, Yuanbo; Tian, Chuanshan; Girit, Caglar; Zettl, Alex; Shen, Y Ron

451

THz Carrier Dynamics in Epitaxial Graphene  

Science Journals Connector (OSTI)

Ultrafast optical pump/THz-probe spectroscopy is used to measure the conductivity recovery dynamics in epitaxial graphene. The observed dynamics are insensitive to probe frequency,...

Divin, Charles J; Sun, Dong; Berger, Claire; de Heer, Walt; First, P N; Norris, Theodore B

452

Tunneling characteristics in chemical vapor deposited graphenehexagonal boron nitridegraphene junctions  

SciTech Connect (OSTI)

Large area chemical vapor deposited graphene and hexagonal boron nitride was used to fabricate graphenehexagonal boron nitridegraphene symmetric field effect transistors. Gate control of the tunneling characteristics is observed similar to previously reported results for exfoliated graphenehexagonal boron nitridegraphene devices. Density-of-states features are observed in the tunneling characteristics of the devices, although without large resonant peaks that would arise from lateral momentum conservation. The lack of distinct resonant behavior is attributed to disorder in the devices, and a possible source of the disorder is discussed.

Roy, T.; Hesabi, Z. R.; Joiner, C. A.; Vogel, E. M. [School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332 (United States); Liu, L.; Gu, G. [Department of Electrical Engineering and Computer Science, University of Tennessee, 1520 Middle Drive, Knoxville, Tennessee 37996 (United States); Barrera, S. de la; Feenstra, R. M. [Department of Physics, Carnegie Mellon University, 5000 Forbes Ave., Pittsburgh, Pennsylvania 15213 (United States); Chakrabarti, B. [School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332 (United States); Department of Materials Science and Engineering, University of Texas at Dallas, 800 West Campbell Rd., Richardson, Texas 75080 (United States)

2014-03-24T23:59:59.000Z

453

Island Wide Management Corporation  

Office of Legacy Management (LM)

9 1986 9 1986 Island Wide Management Corporation 3000 Marcus Avenue Lake Success, New York 11042 Dear Sir or Madam: I am sending you this letter and the enclosed information as you have been identified by L. I. Trinin of Glick Construction Company as the representatives of the owners of the property that was formerly the site of the Sylvania-Corning Nuclear Corporation in Bayside, New York. The Department of Energy is evaluating the radiological condition of sites that were utilized under the Manhattan Engineer District and/or the Atomic Energy Commission in the early years of nuclear energy development to determine whether they need remedial action and whether the Department has authority to perform such action. As you may know, the former Sylvania-Corning Corporation Bayside site was identified as one such site.

454

Textural criteria for the discrimination of water-laid and wind-laid barrier island sands: a North Padre Island, Texas example  

E-Print Network [OSTI]

my fiance, Helen C. Preitag, helped make the completion of this work possible and to them I am forever grateful. TABLE OF CONTENTS INTRODUCTION. STUDY AREA. Page Location History of North Padre Island. Physiography Sampling Barrier... has been more consistent (Heal and Shepard, 1956; Shepard and Young, 1961), but remains controversial along non-Texas barrier islands (Mazzullo and Sims, 1983), To date, however, no study has been simultaneously conducted on both the grain size...

Cunningham, David

2012-06-07T23:59:59.000Z

455

Prince Edward Island: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Island: Energy Resources Island: Energy Resources Jump to: navigation, search Name Prince Edward Island, Canada Equivalent URI DBpedia GeoNames ID 6113358 Coordinates 46.333333°, -63.5° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":46.333333,"lon":-63.5,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

456

United States Virgin Islands: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Virgin Islands: Energy Resources Virgin Islands: Energy Resources Jump to: navigation, search Name United States Virgin Islands 2-letter ISO code VI 3-letter ISO code VIR Numeric ISO code 850 Equivalent URI DBpedia GeoNames ID 4796775 UN Region[1] Latin America and the Caribbean Coordinates 18.34829°, -64.98348° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":18.34829,"lon":-64.98348,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

457

Graphene as a subnanometre trans-electrode , W. Hubbard2  

E-Print Network [OSTI]

#12;LETTERS Graphene as a subnanometre trans-electrode membrane S. Garaj1 , W. Hubbard2 , A. Reina3 of graphite, called graphene, have recently been the subject of intense research with the hope that practical and elec- trical sensitivity of graphene motivated us to investigate the poten- tial use of graphene

Golovchenko, Jene A.

458

hal00276997, Raman spectra of misoriented bilayer graphene  

E-Print Network [OSTI]

hal­00276997, version 1 ­ 5 May 2008 Raman spectra of misoriented bilayer graphene P. Poncharal 1 spectra from single layer graphene with a bilayer in which the two layers are arbitrarily misoriented to the similarity of the electronic structures of single layer graphene and misoriented bilayer graphene. Another

Paris-Sud XI, Université de

459

Flexible Graphene Field-Effect Transistors for Microwave Electronics  

E-Print Network [OSTI]

Flexible Graphene Field-Effect Transistors for Microwave Electronics Inanc Meric , Nicholas Petrone-frequency characteristics of graphene field-effect transistors (GFETs) has received significant interest due the very high carrier velocities in graphene. In addition to excellent electronic performance, graphene possesses

Shepard, Kenneth

460

Crumpled graphene: Conductive inks made by startup company Vorbeck  

E-Print Network [OSTI]

Crumpled graphene: Conductive inks made by startup company Vorbeck Materials contain crumpled graphene. This atomic-force microscope image is colorized to show the topography of a piece of graphene Technology Review in English | en Español | auf Deutsch | in Italiano | Bringing Graphene to Market

Aksay, Ilhan A.

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Electronic Properties of Graphene 8-9 October 2010  

E-Print Network [OSTI]

Electronic Properties of Graphene 8-9 October 2010 The program will focus on the properties of graphene, a single-atom-thick layer of carbon. Discovered in 2004, graphene has quickly become one as the potential it offers to future nano-electronics applications. Originally, the interest in graphene

Petta, Jason

462

Substrate-Free Gas-Phase Synthesis of Graphene Sheets  

E-Print Network [OSTI]

Substrate-Free Gas-Phase Synthesis of Graphene Sheets Albert Dato,*, Velimir Radmilovic, Zonghoon graphene sheets in the gas phase using a substrate-free, atmospheric-pressure microwave plasma reactor. Graphene sheets were synthesized by passing liquid ethanol droplets into an argon plasma. The graphene

Frenklach, Michael

463

Remedial Action Work Plan Amchitka Island Mud Pit Closures  

SciTech Connect (OSTI)

This remedial action work plan presents the project organization and construction procedures developed for the performance of the remedial actions at U.S. Department of Energy (DOE's) sites on Amchitka Island, Alaska. During the late1960s and early 1970s, the U.S. Department of Defense and the U.S. Atomic Energy Commission (the predecessor agency to DOE) used Amchitka Island as a site for underground nuclear tests. A total of nine sites on the Island were considered for nuclear testing; however, tests were only conducted at three sites (i.e., Long Shot in 1965, Milrow in 1969, and Cannikin in 1971). In addition to these three sites, large diameter emplacement holes were drilled in two other locations (Sites D and F) and an exploratory hole was in a third location (Site E). It was estimated that approximately 195 acres were disturbed by drilling or preparation for drilling in conjunction with these activities. The disturbed areas include access roads, spoil-disposal areas, mud pits which have impacted the environment, and an underground storage tank at the hot mix plant which was used to support asphalt-paving operations on the island. The remedial action objective for Amchitka Island is to eliminate human and ecological exposure to contaminants by capping drilling mud pits, removing the tank contents, and closing the tank in place. The remedial actions will meet State of Alaska regulations, U.S. Fish and Wildlife Service refuge management goals, address stakeholder concerns, and address the cultural beliefs and practices of the native people. The U.S. Department of Energy, Nevada Operations Office will conduct work on Amchitka Island under the authority of the Comprehensive Emergency Response, Compensation, and Liability Act. Field activities are scheduled to take place May through September 2001. The results of these activities will be presented in a subsequent Closure Report.

DOE/NV

2001-04-05T23:59:59.000Z

464

EIS-0006: Wind Turbine Generator System, Block Island, Rhode Island  

Broader source: Energy.gov [DOE]

The U.S. Department of Energy prepared this EIS to evaluate the environmental impacts of installing and operating a large experimental wind turbine, designated the MOD-OA, which is proposed to be installed on a knoll in Rhode Island's New Meadow Hill Swamp, integrated with the adjacent Block Island Power Company power plant and operated to supply electricity to the existing utility network.

465

Conversion of Hydroperoxoantimonate Coated Graphenes to Sb2S3@Graphene for a Superior Lithium Battery Anode  

Science Journals Connector (OSTI)

Conversion of Hydroperoxoantimonate Coated Graphenes to Sb2S3@Graphene for a Superior Lithium Battery Anode ... We describe a method for conformal coating of reduced graphene oxide (rGO) by stibnite nanocrystallites. ... antimony sulfide; stibnite; reduced graphene oxide; lithium battery; sulfurization ...

Petr V. Prikhodchenko; Jenny Gun; Sergey Sladkevich; Alexey A. Mikhaylov; Ovadia Lev; Yee Yan Tay; Sudip K. Batabyal; Denis Y. W. Yu

2012-11-22T23:59:59.000Z

466

How Graphene Slides: Measurement and Theory of Strain-Dependent Frictional Forces between Graphene and SiO2  

E-Print Network [OSTI]

How Graphene Slides: Measurement and Theory of Strain- Dependent Frictional Forces between Graphene, and adhesion are interwoven in determining how graphene responds when pulled across a substrate. Using Raman spectroscopy of circular, graphene-sealed microchambers under variable external pressure, we demonstrate

467

Interconnection Guidelines (Rhode Island) | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Interconnection Guidelines (Rhode Island) Interconnection Guidelines (Rhode Island) Interconnection Guidelines (Rhode Island) < Back Eligibility Agricultural Commercial Fed. Government Industrial Institutional Local Government Multi-Family Residential Nonprofit Residential Schools State Government Savings Category Bioenergy Alternative Fuel Vehicles Hydrogen & Fuel Cells Buying & Making Electricity Water Solar Home Weatherization Wind Program Info State Rhode Island Program Type Interconnection Provider Rhode Island Public Utilities Commission Rhode Island enacted legislation (HB 6222) in June 2011 to standardize the application process for the interconnection of customer-sited renewable-energy systems to the state's distribution grid. Rhode Island's interconnection policy is not nearly as comprehensive as

468

Rhode Island/Geothermal | Open Energy Information  

Open Energy Info (EERE)

Rhode Island Rhode Island Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Rhode Island Geothermal General Regulatory Roadmap Geothermal Power Projects Under Development in Rhode Island No geothermal projects listed. Add a geothermal project. Operational Geothermal Power Plants in Rhode Island No geothermal power plants listed. Add a geothermal energy generation facility. Geothermal Areas in Rhode Island No areas listed. GRR-logo.png Geothermal Regulatory Roadmap for Rhode Island Overview Flowchart The flowcharts listed below were developed as part of the Geothermal Regulatory Roadmap project. The flowcharts cover the major requirements for developing geothermal energy, including, land access, exploration and drilling, plant construction and operation, transmission siting, water

469

Better Buildings Neighborhood Program: Bainbridge Island, Washington  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Bainbridge Bainbridge Island, Washington to someone by E-mail Share Better Buildings Neighborhood Program: Bainbridge Island, Washington on Facebook Tweet about Better Buildings Neighborhood Program: Bainbridge Island, Washington on Twitter Bookmark Better Buildings Neighborhood Program: Bainbridge Island, Washington on Google Bookmark Better Buildings Neighborhood Program: Bainbridge Island, Washington on Delicious Rank Better Buildings Neighborhood Program: Bainbridge Island, Washington on Digg Find More places to share Better Buildings Neighborhood Program: Bainbridge Island, Washington on AddThis.com... Better Buildings Residential Network Progress Stories Interviews Videos Events Quick Links to Partner Information AL | AZ | CA | CO | CT FL | GA | IL | IN | LA ME | MD | MA | MI | MO

470

Smooth electron waveguides in graphene  

Science Journals Connector (OSTI)

We present exact analytical solutions for the zero-energy modes of two-dimensional massless Dirac fermions fully confined within a smooth one-dimensional potential V(x)=??/cosh(?x), which provides a good fit for potential profiles of existing top-gated graphene structures. We show that there is a threshold value of the characteristic potential strength ?/? for which the first mode appears, in striking contrast to the nonrelativistic case. A simple relationship between the characteristic strength and the number of modes within the potential is found. An experimental setup is proposed for the observation of these modes. The proposed geometry could be utilized in future graphene-based devices with high on/off current ratios.

R. R. Hartmann; N. J. Robinson; M. E. Portnoi

2010-06-23T23:59:59.000Z

471

Chiral Symmetry Breaking in Graphene  

E-Print Network [OSTI]

The question of whether the Coulomb interaction is strong enough to break the sublattice symmetry of un-doped graphene is discussed. We formulate a strong coupling expansion where the ground state of the Coulomb Hamiltonian is found exactly and the kinetic hopping Hamiltonian is treated as a perturbation. We argue that many of the properties of the resulting system would be shared by graphene with a Hubbard model interaction. In particular, the best candidate sublattice symmetry breaking ground state is an antiferromagnetic Mott insulator. We discuss the results of some numerical simulations which indicate that the Coulomb interaction is indeed subcritical. We also point out the curious fact that, if the electron did not have spin degeneracy, the tendency to break chiral symmetry would be much greater and even relatively weak Coulomb interactions would likely gap the spectrum.

Gordon W. Semenoff

2011-08-15T23:59:59.000Z

472

Model of ripples in graphene  

Science Journals Connector (OSTI)

We propose a model of ripples in suspended graphene sheets based on plate equations that are made discrete with the periodicity of the honeycomb lattice and then periodized. In addition, the equation for the displacements with respect to the planar configuration contains a double-well site potential, a nonlinear friction, and a multiplicative white-noise term satisfying the fluctuation-dissipation theorem. The nonlinear friction terms agree with those proposed by Eichler et al. [Nature Nanotech. 6, 339 (2011)] to explain their experiments with a graphene resonator. The site double-well potential indicates that the carbon atoms at each lattice point have equal probability to move upward or downward off plane. For the considered parameter values, the relaxation time due to friction is much larger than the periods of membrane vibrations and the noise is quite small. Then ripples with no preferred orientation appear as long-lived metastable states for any temperature. Numerical solutions confirm this picture.

L. L. Bonilla and A. Carpio

2012-11-01T23:59:59.000Z

473

Disorder by order in graphene  

Science Journals Connector (OSTI)

We predict the existence of an intriguing disorder by order phenomenon in graphene transport where higher quality (and thus more ordered) samples, while having higher mobility at high carrier density, will manifest more strongly insulating (and thus effectively more disordered) behavior as the carrier density is lowered compared with lower quality samples (with higher disorder) which exhibit an approximate resistivity saturation phenomenon at low carrier density near the Dirac point. This predicted behavior simulating a metal-insulator transition, which we believe to have recently been observed in an experiment at Manchester University [L. A. Ponomarenko et al., Nat. Phys. 7, 958 (2011)], arises from the suppression of Coulomb disorder induced inhomogeneous puddles near the charge neutrality point in high quality graphene samples.

S. Das Sarma; E. H. Hwang; Qiuzi Li

2012-05-24T23:59:59.000Z

474

Smooth electron waveguides in graphene  

E-Print Network [OSTI]

We present exact analytical solutions for the zero-energy modes of two-dimensional massless Dirac fermions fully confined within a smooth one-dimensional potential V(x)= - {\\alpha}/cosh({\\beta}x), which provides a good fit for potential profiles of existing top-gated graphene structures. We show that there is a threshold value of the characteristic potential strength {\\alpha}/{\\beta} for which the first mode appears, in striking contrast to the non-relativistic case. A simple relationship between the characteristic strength and the number of modes within the potential is found. An experimental setup is proposed for the observation of these modes. The proposed geometry could be utilized in future graphene-based devices with high on/off current ratios.

R. R. Hartmann; N. J. Robinson; M. E. Portnoi

2009-08-05T23:59:59.000Z

475

Magnetism in strained graphene dots  

Science Journals Connector (OSTI)

We study the magnetization of square and hexagonal graphene dots. It is shown that two classes of hexagonal dots have a second-order phase transition at a critical Hubbard energy U, whose value is similar to the one in bulk graphene, albeit the dots do not have a density of states proportional to the absolute value of the energy, relatively to the Dirac point. Furthermore, we show that a particular class of hexagonal dots, having zigzag edges, does not exhibit zero-energy edge states. We also study the effect of uniaxial strain on the evolution of the magnetization of square dots and find that the overall effect is an enhancement of magnetization with strain. The enhancement can be as large as 100% for strain on the order of 20%. Additionally, stress induces a spatial displacement of the magnetization over the dot, moving it from the zigzag to the armchair edges.

J. Viana-Gomes; Vitor M. Pereira; N. M. R. Peres

2009-12-29T23:59:59.000Z

476

Carribean Islands | OpenEI  

Open Energy Info (EERE)

Carribean Islands Carribean Islands Dataset Summary Description (Abstract): Monthly Average Solar Resource for horizontal flat-plate collectors, for Mexico, Central America, and the Caribbean Islands. (Purpose): Provide information on the solar resource potential for the data domain. The insolation values represent the average solar energy available to a flat plate collector, such as a photovoltaic panel, oriented horizontally. Source NREL Date Released January 31st, 2004 (10 years ago) Date Updated October 30th, 2007 (7 years ago) Keywords Carribean Islands Central America GEF GHI GIS Mexico NREL solar SWERA UNEP Data text/csv icon Download Data (csv, 370.6 KiB) application/zip icon Download Shapefile (zip, 244 KiB) Quality Metrics Level of Review Some Review Comment Temporal and Spatial Coverage

477

Chikurachki volcano (Kurile Islands, Russia)  

E-Print Network [OSTI]

Chikurachki volcano (Kurile Islands, Russia) the unique volcano with frequent basaltic plinian-Kamchatsky, Russia #12;#12;Historical eruptions of Chikurachki Year 1853-59 1958 1961 1964 1973 1986 2002 Column

Belousov, Alexander

478

Island Cosmology in the Landscape  

E-Print Network [OSTI]

In the eternally inflationary background driven by the metastable vacua of the landscape, it is possible that some local quantum fluctuations with the null energy condition violation can be large enough to stride over the barriers among different vacua, so that create some islands full of radiation in new vacua, and then these emergently thermalized islands will enter into the evolution of standard big bang cosmology. In this paper, we calculate the spectrum of curvature perturbation generated during the emergence of island. We find that generally the spectrum obtained is nearly scale invariant, which can be well related to that of slow roll inflation by a simple duality. This in some sense suggests a degeneracy between their scalar spectra. In addition, we also simply estimate the non-Gaussianity of perturbation, which is naturally large, yet, can lie well in the observational bound. The results shown here indicate that the island emergently thermalized in the landscape can be consistent with our observable universe.

Yun-Song Piao

2008-06-11T23:59:59.000Z

479

Long Island | OpenEI  

Open Energy Info (EERE)

Long Island Long Island Dataset Summary Description This dataset comes from the Energy Information Administration (EIA), and is part of the 2011 Annual Energy Outlook Report (AEO2011). This dataset is table 79, and contains only the reference case. The data is broken down into electric power sector, cumulative planned additions,cumulative unplanned additions,cumulative retirements, end-use sector, electricity sales, net energy for load, generation by fuel type and price by service category. Source EIA Date Released April 26th, 2011 (3 years ago) Date Updated Unknown Keywords 2011 AEO EIA Electric Power Long Island projections Data application/vnd.ms-excel icon AEO2011: Electric Power Projections for EMM Region - Northeast Power Coordinating Council / Long Island- Reference Case (xls, 258.6 KiB)

480

Wafer-Scale Graphene Integrated Circuit  

Science Journals Connector (OSTI)

...feasibility of large-area graphene synthesis...to damage in plasma processing. Thus...frequencies fIF of 200 MHz and f RF + f LO...frequencies of 200 MHz and 7.8 GHz with...operated at 10 MHz with a 40-dB...graphene layers by atmospheric pressure graphitization...

Yu-Ming Lin; Alberto Valdes-Garcia; Shu-Jen Han; Damon B. Farmer; Inanc Meric; Yanning Sun; Yanqing Wu; Christos Dimitrakopoulos; Alfred Grill; Phaedon Avouris; Keith A. Jenkins

2011-06-10T23:59:59.000Z

Note: This page contains sample records for the topic "locate graphene islands" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Manifestations of topological effects in graphene  

E-Print Network [OSTI]

Graphene is a monoatomic layer of graphite with Carbon atoms arranged in a two dimensional honeycomb lattice configuration. It has been known for more than sixty years that the electronic structure of graphene can be modelled by two-dimensional massless relativistic fermions. This property gives rise to numerous applications, both in applied sciences and in theoretical physics. Electronic circuits made out of graphene could take advantage of its high electron mobility that is witnessed even at room temperature. In the theoretical domain the Dirac-like behavior of graphene can simulate high energy effects, such as the relativistic Klein paradox. Even more surprisingly, topological effects can be encoded in graphene such as the generation of vortices, charge fractionalization and the emergence of anyons. The impact of the topological effects on graphene's electronic properties can be elegantly described by the Atiyah-Singer index theorem. Here we present a pedagogical encounter of this theorem and review its various applications to graphene. A direct consequence of the index theorem is charge fractionalization that is usually known from the fractional quantum Hall effect. The charge fractionalization gives rise to the exciting possibility of realizing graphene based anyons that unlike bosons or fermions exhibit fractional statistics. Besides being of theoretical interest, anyons are a strong candidate for performing error free quantum information processing.

Jiannis K. Pachos

2008-12-05T23:59:59.000Z

482

Pseudospin entanglement and Bell test in graphene  

E-Print Network [OSTI]

We propose a way of producing and detecting pseudospin entanglement between electrons and holes in graphene. Electron-hole pairs are produced by a fluctuating potential and their entanglement is demonstrated by a current correlation measurement. The chirality of electrons in graphene facilitates a well-controlled Bell test with (pseudo-)spin projection angles defined in real space.

M. Kindermann

2008-07-01T23:59:59.000Z

483

The Quantum Hall Effect in Graphene  

E-Print Network [OSTI]

We investigate the quantum Hall effect in graphene. We argue that in graphene in presence of an external magnetic field there is dynamical generation of mass by a rearrangement of the Dirac sea. We show that the mechanism breaks the lattice valley degeneracy only for the $n=0$ Landau levels and leads to the new observed $\

Paolo Cea

2011-01-29T23:59:59.000Z

484

Adsorption of small molecules on graphene  

Science Journals Connector (OSTI)

We investigate the adsorption process of small molecules on graphene through first-principles calculations and show the presence of two main charge transfer mechanisms. Which mechanism is the dominant one depends on the magnetic properties of the adsorbing ... Keywords: Adsorption, Graphene

O. Leenaerts; B. Partoens; F. M. Peeters

2009-04-01T23:59:59.000Z

485

Nanocomposite of graphene and metal oxide materials  

SciTech Connect (OSTI)

Nanocomposite materials comprising a metal oxide bonded to at least one graphene material. The nanocomposite materials exhibit a specific capacity of at least twice that of the metal oxide material without the graphene at a charge/discharge rate greater than about 10C.

Liu, Jun; Aksay, Ilhan A.; Choi, Daiwon; Wang, Donghai; Yang, Zhenguo

2012-09-04T23:59:59.000Z

486

Cyclotron radiation and emission in graphene  

Science Journals Connector (OSTI)

Peculiarity in the cyclotron radiation and emission in graphene is theoretically examined in terms of the optical conductivity and relaxation rates to propose that graphene in magnetic fields can be a candidate for realizing the Landau-level laser, proposed decades ago [H. Aoki, Appl. Phys. Lett. 48, 559 (1986)].

Takahiro Morimoto; Yasuhiro Hatsugai; Hideo Aoki

2008-08-27T23:59:59.000Z

487

Pseudo-spin paramagnetism in graphene  

SciTech Connect (OSTI)

We calculate the orbital diamagnetic susceptibility of monolayer graphene with an energy gap. The valley pseudo-spin produces paramagnetic susceptibility analogous to contribution from real spin, and explains the origin of a singular orbital magnetism at Dirac point of monolayer graphene.

Koshino, Mikito; Ando, Tsuneya [Department of Physics, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8551 (Japan)

2011-12-23T23:59:59.000Z

488

The Hawking-Unruh phenomenon on graphene  

E-Print Network [OSTI]

We find that, for a very specific shape of a monolayer graphene sample, a general relativistic-like description of a back-ground spacetime for graphene's conductivity electrons is very natural. The corresponding electronic local density of states is of finite temperature. This is a Hawking-Unruh effect that we propose to detect through an experiment with a Scanning Tunneling Microscope.

Alfredo Iorio; Gaetano Lambiase

2011-08-11T23:59:59.000Z

489

Anomalous friction in suspended graphene  

Science Journals Connector (OSTI)

Since the discovery of the Amonton's law and with support of modern tribological models, friction between surfaces of three-dimensional materials is known to generally increase when the surfaces are in closer contact. Here, using molecular dynamics simulations of friction force microscopy on suspended graphene, we demonstrate an increase of? friction when the scanning tip is retracted away from the sample. We explain the observed behavior and address why this phenomenon has not been observed for isotropic 3D materials.

A. Smolyanitsky and J. P. Killgore

2012-09-20T23:59:59.000Z

490

Helicity -- from Clifford to Graphene  

E-Print Network [OSTI]

We investigate two seemingly disjoint definitions of helicity, one commonly used in particle physics, the other one used when studying bilinear covariants of Clifford algebras. We can prove that the `mathematical' definition of helicity implies its `physical' counterpart. As an unexpected application of our result we show that the Hamiltonian describing the one-layer superconductor Graphene is proportional to the trace of an operator that is used in the `mathematical' definition of helicity.

Christian G. Boehmer; Louie Corpe

2012-03-31T23:59:59.000Z

491

Graphene, neutrino mass and oscillation  

E-Print Network [OSTI]

A resolution of the Abraham-Minkowski dilemma is presented that other constant velocities can play the role of c in the theory of relativity. For example, in 2005 electrons of graphene were discovered to behave as if the coefficient is a Fermi velocity. Then we propose a conjecture for neutrinos to avoid the contradiction among two-component theory, negative rest mass-square and oscillation.

Z. Y. Wang

2009-09-10T23:59:59.000Z

492

Deconfined criticality in bilayer graphene  

Science Journals Connector (OSTI)

We propose that bilayer graphene can provide an experimental realization of deconfined criticality. Current experiments indicate the presence of Nel order in the presence of a moderate magnetic field. The Nel order can be destabilized by application of a transverse electric field. The resulting electric field induced state is likely to have valence bond solid order, and the transition can acquire the emergent fractionalized and gauge excitations of deconfined criticality.

Junhyun Lee and Subir Sachdev

2014-11-19T23:59:59.000Z

493

Andreev reflection in bilayer graphene  

Science Journals Connector (OSTI)

We consider the differential conductance of a normal-superconductor junction in clean bilayer graphene in the framework of the DiracBogoliubovde Gennes equation. A remarkable suppression of the differential conductance at voltages just below the superconducting gap is found. This can be understood in terms of the spinor structures of the electron and hole excitations, in particular, the reflected valence-band hole being orthogonal to the incoming electron at normal incidence.

T. Ludwig

2007-05-18T23:59:59.000Z

494

Graphene-based polaritonic crystal  

Science Journals Connector (OSTI)

It is shown that monolayer graphene deposited on a spatially periodic gate behaves as a polaritonic crystal. Its band structure depending on the applied gate voltage is studied. The scattering of electromagnetic radiation from such a crystal is presented calculated and its spectral dependence is analyzed in terms of Fano-type resonances between the reflected continuum and plasmon-polariton modes forming narrow bands.

Yu. V. Bludov; N. M. R. Peres; M. I. Vasilevskiy

2012-06-05T23:59:59.000Z

495

DOE - Office of Legacy Management -- Mare Island Navy Yard - CA 0-01  

Office of Legacy Management (LM)

Mare Island Navy Yard - CA 0-01 Mare Island Navy Yard - CA 0-01 FUSRAP Considered Sites Site: MARE ISLAND NAVY YARD (CA.0-01 ) Eliminated from consideration under FUSRAP - Referred to DoD Designated Name: Not Designated Alternate Name: None Location: Mare Island , California CA.0-01-2 Evaluation Year: 1989 CA.0-01-1 Site Operations: Naval yard and shipping station. CA.0-01-2 Site Disposition: Eliminated - Referred to DOD CA.0-01-1 CA.0-01-2 Radioactive Materials Handled: None Indicated Primary Radioactive Materials Handled: None CA.0-01-2 Radiological Survey(s): None Indicated Site Status: Eliminated from consideration under FUSRAP - Referred to DoD CA.0-01-2 Also see Documents Related to MARE ISLAND NAVY YARD CA.0-01-1 - DOE Memorandum; Wallo to Carwell; Subject: List of

496

Electronic structure of turbostratic graphene  

Science Journals Connector (OSTI)

We explore the rotational degree of freedom between graphene layers via the simple prototype of the graphene twist bilayer, i.e., two layers rotated by some angle ?. It is shown that, due to the weak interaction between graphene layers, many features of this system can be understood by interference conditions between the quantum states of the two layers, mathematically expressed as Diophantine problems. Based on this general analysis we demonstrate that while the Dirac cones from each layer are always effectively degenerate, the Fermi velocity vF of the Dirac cones decreases as ??0; the form we derive for vF(?) agrees with that found via a continuum approximation in [J. M. B. Lopes dos Santos, N. M. R. Peres, and A. H. Castro Neto, Phys. Rev. Lett. 99, 256802 (2007)]. From tight-binding calculations for structures with 1.47??0 the Dirac point is fourfold degenerate, while at ?=0 one has the twofold degeneracy of the AB stacked bilayer. Interestingly, in this limit the electronic properties are in an essential way determined globally, in contrast to the nearsightedness [W. Kohn, Phys. Rev. Lett. 76, 3168 (1996)] of electronic structure generally found in condensed matter.

S. Shallcross; S. Sharma; E. Kandelaki; O. A. Pankratov

2010-04-09T23:59:59.000Z

497

First Observation of Plasmarons in Graphene  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

First Observation of Plasmarons First Observation of Plasmarons in Graphene First Observation of Plasmarons in Graphene Print Wednesday, 30 June 2010 00:00 An international team of scientists performing angle-resolved photoemission spectroscopy (ARPES) experiments at ALS Beamline 7.0.1 have found that composite particles called plasmarons play a vital role in determining graphene's properties. A plasmaron consists of a charge carrier (electron or hole) coupled with a plasmon-an electron density wave. Although plasmarons were proposed theoretically in the late 1960s, and indirect evidence of them has been found, this work is the first observation of their distinct energy bands in graphene, or indeed in any material. The discovery may hasten the day when graphene can be used for "plasmonics" to build ultrafast computers-perhaps even room-temperature quantum computers-plus a wide range of other tools and applications.

498

First Observation of Plasmarons in Graphene  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

First Observation of Plasmarons in Graphene Print First Observation of Plasmarons in Graphene Print An international team of scientists performing angle-resolved photoemission spectroscopy (ARPES) experiments at ALS Beamline 7.0.1 have found that composite particles called plasmarons play a vital role in determining graphene's properties. A plasmaron consists of a charge carrier (electron or hole) coupled with a plasmon-an electron density wave. Although plasmarons were proposed theoretically in the late 1960s, and indirect evidence of them has been found, this work is the first observation of their distinct energy bands in graphene, or indeed in any material. The discovery may hasten the day when graphene can be used for "plasmonics" to build ultrafast computers-perhaps even room-temperature quantum computers-plus a wide range of other tools and applications.

499

First Observation of Plasmarons in Graphene  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

First Observation of Plasmarons in Graphene Print First Observation of Plasmarons in Graphene Print An international team of scientists performing angle-resolved photoemission spectroscopy (ARPES) experiments at ALS Beamline 7.0.1 have found that composite particles called plasmarons play a vital role in determining graphene's properties. A plasmaron consists of a charge carrier (electron or hole) coupled with a plasmon-an electron density wave. Although plasmarons were proposed theoretically in the late 1960s, and indirect evidence of them has been found, this work is the first observation of their distinct energy bands in graphene, or indeed in any material. The discovery may hasten the day when graphene can be used for "plasmonics" to build ultrafast computers-perhaps even room-temperature quantum computers-plus a wide range of other tools and applications.

500

Theory of Coulomb drag in graphene  

Science Journals Connector (OSTI)

We study the Coulomb drag between two single graphene sheets in intrinsic and extrinsic graphene systems with no interlayer tunneling. The general expression for the nonlinear susceptibility appropriate for single-layer graphene systems is derived using the diagrammatic perturbation theory, and the corresponding exact zero-temperature expression is obtained analytically. We find that, despite the existence of a nonzero conductivity in an intrinsic graphene layer, the Coulomb drag between intrinsic graphene layers vanishes at all temperatures. In extrinsic systems, we obtain numerical results and an approximate analytical result for the drag resistivity ?D, and find that ?D goes as T2 at low temperature T, as 1?d4 for large layer separation d, and 1?n3 for high carrier density n. We also discuss qualitatively the effect of plasmon-induced enhancement on the Coulomb drag, which should occur at a temperature of the order of or higher than the Fermi temperature.

Wang-Kong Tse; Ben Yu-Kuang Hu; S. Das Sarma

2007-08-06T23:59:59.000Z