期刊
CARBON
卷 50, 期 3, 页码 808-814出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2011.09.037
关键词
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资金
- Department of Energy [DE-FG02-07ER46375]
- National Science Foundation [NSF-DMR-0906961]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0906961] Funding Source: National Science Foundation
Capacitive photocurrent spectroscopy is used to probe the electronic states of graphene-oxide, and reduced graphene-oxide. Three peaks are observed whose intensities scale with the oxygen coverage. The energy of these peaks correlate with the luminescence spectra reported for graphene-oxide. Using a fitting procedure, the density of states for graphene oxide is extracted from the data. It consists of the pi/pi(center dot) states along with a distribution of mid-gap states centered at three different energies near the Dirac point. X-ray photoelectron spectroscopy measurements are used to identify the oxygen functional groups corresponding to the observed state distribution. (C) 2011 Elsevier Ltd. All rights reserved.
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