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Lee, Geunsik
Electronic Structure and Transport in Condensed Materials
Research Interests
  • open quantum system, non-equilibrium electron transport
  • electron correlation, dynamical mean field theory
  • 2D materials, metal complexes

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Unusual infrared-absorption mechanism in thermally reduced graphene oxide

Cited 197 times inthomson ciCited 199 times inthomson ci
Title
Unusual infrared-absorption mechanism in thermally reduced graphene oxide
Other Titles
Unusual infrared-absorption mechanism in thermally reduced graphene oxide
Author
Acik, M.Lee, GeunsikMattevi, C.Chhowalla, M.Cho, K.Chabal, Y. J.
Issue Date
2010-10
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE MATERIALS, v.9, no.10, pp.840 - 845
Abstract
Infrared absorption of atomic and molecular vibrations in solids can be affected by electronic contributions through non-adiabatic interactions, such as the Fano effect. Typically, the infrared-absorption lineshapes are modified, or infrared-forbidden modes are detectable as a modulation of the electronic absorption. In contrast to such known phenomena, we report here the observation of a giant-infrared-absorption band in reduced graphene oxide, arising from the coupling of electronic states to the asymmetric stretch mode of a yet-unreported structure, consisting of oxygen atoms aggregated at the edges of defects. Free electrons are induced by the displacement of the oxygen atoms, leading to a strong infrared absorption that is in phase with the phonon mode. This new phenomenon is only possible when all other oxygen-containing chemical species, including hydroxyl, carboxyl, epoxide and ketonic functional groups, are removed from the region adjacent to the edges, that is, clean graphene patches are present
URI
https://scholarworks.unist.ac.kr/handle/201301/13275
URL
http://www.nature.com/nmat/journal/v9/n10/full/nmat2858.html
DOI
10.1038/nmat2858
ISSN
1476-1122
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