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In-situ Raman spectroscopy of current-carrying graphene microbridge

Cited 9 time in Web of Science Cited 9 time in Scopus
Authors
Choi, Minkyung; Son, Jangyup; Choi, Heechae; Shin, Hyun-Joon; Lee, Sangho; Kim, Sanghoon; Lee, Soogil; Kim, Seungchul; Lee, Kwang-Ryeol; Kim, Sang Jin; Hong, Byung Hee; Hong, Jongill; Yang, In-Sang
Issue Date
2014-02
Citation
Journal of Raman Spectroscopy, Vol.45 No.2, pp.168-172
Keywords
in-situ Raman spectroscopygrapheneJoule heatingdoping
Abstract
In-situ Raman spectroscopy was performed on chemical vapor deposited graphene microbridge (3mx80m) under electrical current density up to 2.58x10(8) A/cm(2) in ambient conditions. We found that both the G and the G peak of the Raman spectra do not restore back to the initial values at zero current, but to slightly higher values after switching off the current through the microbridge. The up-shift of the G peak and the G peak, after switching off the electrical current, is believed to be due to p-doping by oxygen adsorption, which is confirmed by scanning photoemission microscopy. Both C-O and C=O bond components in the C1s spectra from the microbridge were found to be significantly increased after high electrical current density was flown. The C=O bond is likely the main source of the p-doping according to our density functional theory calculation of the electronic structure. Copyright (c) 2014 John Wiley & Sons, Ltd.
ISSN
0377-0486
URI
https://hdl.handle.net/10371/172208
DOI
https://doi.org/10.1002/jrs.4442
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
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