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Title: Room temperature deintercalation of alkali metal atoms from epitaxial graphene by formation of charge-transfer complexes

Abstract

Atom (or molecule) intercalations and deintercalations have been used to control the electronic properties of graphene. In general, finite energies above room temperature (RT) thermal energy are required for the intercalations and deintercalations. Here, we demonstrate that alkali metal atoms can be deintercalated from epitaxial graphene on a SiC substrate at RT, resulting in the reduction in density of states at the Fermi level. The change in density of states at the Fermi level at RT can be applied to a highly sensitive graphene sensor operating at RT. Na atoms, which were intercalated at a temperature of 80 °C, were deintercalated at a high temperature above 1000 °C when only a thermal treatment was used. In contrast to the thermal treatment, the intercalated Na atoms were deintercalated at RT when tetrafluorotetracyanoquinodimethane (F4-TCNQ) molecules were adsorbed on the surface. The RT deintercalation occurred via the formation of charge-transfer complexes between Na atoms and F4-TCNQ molecules.

Authors:
; ; ; ;  [1];  [2];  [1];  [3]
  1. Department of Physics, Sungkyunkwan University, Suwon 440-746 (Korea, Republic of)
  2. College of Pharmacy, Chungnam National University, Daejeon 305–764 (Korea, Republic of)
  3. (Korea, Republic of)
Publication Date:
OSTI Identifier:
22590478
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 109; Journal Issue: 8; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALKALI METALS; ATOMS; CLATHRATES; DENSITY OF STATES; EPITAXY; FERMI LEVEL; GRAPHENE; HEAT TREATMENTS; MOLECULES; SILICON CARBIDES; SUBSTRATES; SURFACES; TEMPERATURE RANGE 0273-0400 K

Citation Formats

Shin, H.-C., Ahn, S. J., Kim, H. W., Moon, Y., Rai, K. B., Woo, S. H., Ahn, J. R., E-mail: jrahn@skku.edu, and SAINT, Sungkyunkwan University, Suwon 440-746. Room temperature deintercalation of alkali metal atoms from epitaxial graphene by formation of charge-transfer complexes. United States: N. p., 2016. Web. doi:10.1063/1.4961633.
Shin, H.-C., Ahn, S. J., Kim, H. W., Moon, Y., Rai, K. B., Woo, S. H., Ahn, J. R., E-mail: jrahn@skku.edu, & SAINT, Sungkyunkwan University, Suwon 440-746. Room temperature deintercalation of alkali metal atoms from epitaxial graphene by formation of charge-transfer complexes. United States. doi:10.1063/1.4961633.
Shin, H.-C., Ahn, S. J., Kim, H. W., Moon, Y., Rai, K. B., Woo, S. H., Ahn, J. R., E-mail: jrahn@skku.edu, and SAINT, Sungkyunkwan University, Suwon 440-746. 2016. "Room temperature deintercalation of alkali metal atoms from epitaxial graphene by formation of charge-transfer complexes". United States. doi:10.1063/1.4961633.
@article{osti_22590478,
title = {Room temperature deintercalation of alkali metal atoms from epitaxial graphene by formation of charge-transfer complexes},
author = {Shin, H.-C. and Ahn, S. J. and Kim, H. W. and Moon, Y. and Rai, K. B. and Woo, S. H. and Ahn, J. R., E-mail: jrahn@skku.edu and SAINT, Sungkyunkwan University, Suwon 440-746},
abstractNote = {Atom (or molecule) intercalations and deintercalations have been used to control the electronic properties of graphene. In general, finite energies above room temperature (RT) thermal energy are required for the intercalations and deintercalations. Here, we demonstrate that alkali metal atoms can be deintercalated from epitaxial graphene on a SiC substrate at RT, resulting in the reduction in density of states at the Fermi level. The change in density of states at the Fermi level at RT can be applied to a highly sensitive graphene sensor operating at RT. Na atoms, which were intercalated at a temperature of 80 °C, were deintercalated at a high temperature above 1000 °C when only a thermal treatment was used. In contrast to the thermal treatment, the intercalated Na atoms were deintercalated at RT when tetrafluorotetracyanoquinodimethane (F4-TCNQ) molecules were adsorbed on the surface. The RT deintercalation occurred via the formation of charge-transfer complexes between Na atoms and F4-TCNQ molecules.},
doi = {10.1063/1.4961633},
journal = {Applied Physics Letters},
number = 8,
volume = 109,
place = {United States},
year = 2016,
month = 8
}