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New insights into the density of states of graphene oxide using capacitive photocurrent spectroscopy
- Source :
-
Carbon . Mar2012, Vol. 50 Issue 3, p808-814. 7p. - Publication Year :
- 2012
-
Abstract
- Abstract: 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 π/π∗ 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. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00086223
- Volume :
- 50
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Carbon
- Publication Type :
- Academic Journal
- Accession number :
- 70042118
- Full Text :
- https://doi.org/10.1016/j.carbon.2011.09.037