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Title: Organic Dye Graphene Hybrid Structures with Spectral Color Selectivity

Authors:
 [1];  [1];  [2];  [2];  [3];  [1];  [4];  [2];  [5]
  1. SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746 Korea
  2. Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive Evanston IL 60208 USA
  3. Department of Chemical Engineering, Soongsil University, Seoul 156-743 Korea
  4. Division of Nano & Energy Convergence Research, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 711-873 Korea
  5. SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746 Korea, School of Chemical Engineering, Sungkyunkwan University, Suwon 440-746 Korea
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1401456
Grant/Contract Number:
FG02-07ER46433
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Advanced Functional Materials
Additional Journal Information:
Journal Volume: 26; Journal Issue: 36; Related Information: CHORUS Timestamp: 2017-10-20 17:19:30; Journal ID: ISSN 1616-301X
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
Germany
Language:
English

Citation Formats

Gim, Yu Seong, Lee, Youngbin, Kim, Soo, Hao, Shiqiang, Kang, Moon Sung, Yoo, Won Jong, Kim, Hyunmin, Wolverton, Chris, and Cho, Jeong Ho. Organic Dye Graphene Hybrid Structures with Spectral Color Selectivity. Germany: N. p., 2016. Web. doi:10.1002/adfm.201601200.
Gim, Yu Seong, Lee, Youngbin, Kim, Soo, Hao, Shiqiang, Kang, Moon Sung, Yoo, Won Jong, Kim, Hyunmin, Wolverton, Chris, & Cho, Jeong Ho. Organic Dye Graphene Hybrid Structures with Spectral Color Selectivity. Germany. doi:10.1002/adfm.201601200.
Gim, Yu Seong, Lee, Youngbin, Kim, Soo, Hao, Shiqiang, Kang, Moon Sung, Yoo, Won Jong, Kim, Hyunmin, Wolverton, Chris, and Cho, Jeong Ho. Mon . "Organic Dye Graphene Hybrid Structures with Spectral Color Selectivity". Germany. doi:10.1002/adfm.201601200.
@article{osti_1401456,
title = {Organic Dye Graphene Hybrid Structures with Spectral Color Selectivity},
author = {Gim, Yu Seong and Lee, Youngbin and Kim, Soo and Hao, Shiqiang and Kang, Moon Sung and Yoo, Won Jong and Kim, Hyunmin and Wolverton, Chris and Cho, Jeong Ho},
abstractNote = {},
doi = {10.1002/adfm.201601200},
journal = {Advanced Functional Materials},
number = 36,
volume = 26,
place = {Germany},
year = {Mon Jul 18 00:00:00 EDT 2016},
month = {Mon Jul 18 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1002/adfm.201601200

Citation Metrics:
Cited by: 5works
Citation information provided by
Web of Science

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  • Graphene has been discovered to have two effects on the photoluminescence (PL) properties of graphene/GeSi quantum dot (QD) hybrid structures, which were formed by covering monolayer graphene sheet on the multilayer ordered GeSi QDs sample surfaces. At the excitation of 488 nm laser line, the hybrid structure had a reduced PL intensity, while at the excitation of 325 nm, it had an enhanced PL intensity. The attenuation in PL intensity can be attributed to the transferring of electrons from the conducting band of GeSi QDs to the graphene sheet. The electron transfer mechanism was confirmed by the time resolved PL measurements. Formore » the PL enhancement, a mechanism called surface-plasmon-polariton (SPP) enhanced absorption mechanism is proposed, in which the excitation of SPP in the graphene is suggested. Due to the resonant excitation of SPP by incident light, the absorption of incident light is much enhanced at the surface region, thus leading to more exciton generation and a PL enhancement in the region. The results may be helpful to provide us a way to improve optical properties of low dimensional surface structures.« less
  • Owing to the unique physical properties, nanographene platelets could act as a good recombination inhibitor for functional materials. In this study, various concentrations of nanographene platelets are introduced to ferromagnetic Fe{sub 3}O{sub 4} nanoparticles to remove methylene blue in aqueous solution under ultrasonic irradiation. The coupling of nanographene platelets with Fe{sub 3}O{sub 4} nanoparticles is formed using hydrothermal method. Compared to pure Fe{sub 3}O{sub 4} nanoparticles, Fe{sub 3}O{sub 4}–nanographene platelets (Fe{sub 3}O{sub 4}–NGP) composites exhibited higher catalytic efficiency for methylene blue removal under ultrasonic irradiation. The catalytic efficiency increase with increasing nanographene platelets loading from 1 wt.% until 5 wt%more » and further decreased. From the scavenger technique, it is revealed that hole plays an important key role in sonocatalytic processes. The degradation efficiency decreased only 12% after 4 cycled.« less
  • Black carbon (BC), a main component of combustion-generated soot, is a strong absorber of sunlight and contributes to climate change. Measurement methods for BC are uncertain, however. This study presents a method for analyzing the BC mass loading on a quartz fiber filter using a modified thermal-optical analysis method, wherein light transmitted through the sample is measured over a spectral region instead of at a single wavelength as the sample is heated. Evolution of the spectral light transmission signal depends on the relative amounts of light-absorbing BC and char, the latter of which forms when organic carbon in the samplemore » pyrolyzes during heating. Absorption selectivities of BC and char are found to be distinct and are used to apportion the amount of light attenuated by each component in the sample. Light attenuation is converted to mass concentration based on derived mass attenuation efficiencies (MAE) of BC and char. The fraction of attenuation due to each component are scaled by their individual MAE values and added together as the total mass of light absorbing carbon (LAC). An iterative algorithm is used to find the MAE values for both BC and char that provide the best fit to the carbon mass remaining on the filter (derived from direct measurements of thermally evolved CO{sub 2}) at temperatures higher than 480 C. This method was applied to measure the BC concentration in precipitation samples collected from coastal and mountain sites in Northern California. The uncertainty in measured BC concentration of samples that contained a high concentration of organics susceptible to char ranged from 12 to 100 percent, depending on the mass loading of BC on the filter. The lower detection limit for this method was approximately 0.35 {micro}g BC and uncertainty approached 20 percent for BC mass loading greater than 1.0 {micro}g BC.« less
  • Strong periodic structures have been observed in the spectrum of a broadband transversely pumped pulsed dye laser which does not contain, prima facie, any optical interference element.
  • New technologies for direct solar energy conversion have gained more attention in the last few years. In particular, Dye Sensitized Solar Cells (DSSCs) are promising in terms of efficiency and low cost [1,2]. Benefited from systematic device engineering and continuous material innovation, a state of the art DSC with a ruthenium sensitizer has achieved a validated efficiency of 11.1%[3] measured under the air mass 1.5 global (AM1.5G) conditions.The optimized geometries of the 3, 4-Pyridinedicarbonitrile, 3-Aminophthalonitrile, 4-Aminophthalonitrile and 4-Methylphthalonitrile are shown in Fig. 1(a). The frontier molecular orbitals (MO) energies of the dyes 3, 4 Pyridinedicarbonitrile, 3-Nitrophthalonitrile, 4-Aminophthalonitrile and 4-Methylphthalonitrile aremore » shown in Fig. 1(b). The HOMO-LUMO gap of the dye 3, 4 Pyridinedicarbonitrile, 3-Aminophthalonitrile, 4-Aminophthalonitrile and 4-Methylphthalonitrile in vacuum is 5.96 eV, 5.54 eV, 5.57 eV, 5.76 eV respectively. The geometries, electronic structures, polarizabilities, and hyperpolarizabilities of dyes 3, 4-Pyridinedicarbonitrile, 4-Aminophthalonitrile and 4-Methylphthalonitrile were studied by using density functional theory with hybrid functional B3LYP, and the UV-Vis spectra were investigated by using TDDFT methods. The NBO results suggest that 3, 4-Pyridinedicarbonitrile, 3-Aminophthalonitrile 4-Aminophthalonitrile and 4-Methylphthalonitrile are all (D-pi-A) systems. The calculated isotropic polarizability of 3, 4-Pyridinedicarbonitrile, 3-Aminophthalonitrile, 4-Aminophthalonitrile and 4-Methylphthalonitrile is. 85.76, 112.72, 26.63 and 115.13 a.u., respectively. The calculated polarizability anisotropy invariant of 3, 4-Pyridinedicarbonitrile, 3-Aminophthalonitrile, 4-Aminophthalonitrile and 4-Methylphthalonitrile is 74.451, 83.533, 62.653 and 88.526 a.u., respectively. The hyperpolarizabilities of 3, 4-Pyridinedicarbonitrile, 3-Aminophthalonitrile, 4-Aminophthalonitrile and 4-Methylphthalonitrile is 0.80628, 5.60646, 7.7979 and 1.86216 (in a.u.), respectively. The frequencies of strongest IR absorption for 3, 4-Pyridinedicarbonitrile, 3-Aminophthalonitrile, 4-Aminophthalonitrile and 4-Methylphthalonitrile are 1614 cm{sup -1}, 290 cm{sup -1}, 387 cm{sup -1} and 846 cm{sup -1} and the frequencies of strongest Raman activity for 3, 4-Pyridinedicarbonitrile, 3-Aminophthalonitrile, 4-Aminophthalonitrile and 4-Methylphthalonitrile are 2345 cm{sup -1}, 2338 cm{sup -1},2329 cm{sup -1}, 2337cm{sup -1}, respectively. The electronic absorption spectral features in visible and near-UV region were assigned based on the qualitative agreement to TDDFT calculations. The absorptions are all ascribed to {pi}{yields}{pi}* transition. The three excited states with the lowest excited energies of 3, 4-Pyridinedicarbonitrile, 3-Aminophthalonitrile, 4-Aminophthalonitrile and 4-Methylphthalonitrile are photoinduced electron transfer processes that contributes sensitization of photo-to-current conversion processes. The interfacial electron transfer between semiconductor TiO{sub 2} electrode and dye sensitizer 3, 4- Pyridinedicarbonitrile, 3-Aminophthalonitrile, 4-Aminophthalonitrile and 4-Methylphthalonitrile is electron injection process from excited dyes as donor to the semiconductor conduction band. Based on the comparative analysis of geometries, electronic structures, and spectrum properties between 3, 4-Pyridinedicarbonitrile, 3-Aminophthalonitrile, 4-Aminophthalonitrile and 4-Methylphthalonitrile the role of amide and methyl groups in phthalonitrile is as follows: it enlarged the distance between electron donor group and semiconductor surface, and decreased the timescale of the electron injection rate, resulted in giving lower conversion efficiency. This indicates that the choice of the appropriate conjugate bridge in dye sensitizer is very important to enhance the performance of DSSC.« less