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- Title
The Effect of Thermal Reduction on the Photoluminescence and Electronic Structures of Graphene Oxides.
- Authors
C.-H. Chuang; Y.-F. Wang; Y.-C. Shao; Y.-C. Yeh; D.-Y. Wang; C.-W. Chen; J. W. Chiou; Ray, Sekhar C.; W. F. Pong; L. Zhang; J. F. Zhu; J. H. Guo
- Abstract
Electronic structures of graphene oxide (GO) and hydro-thermally reduced graphene oxides (rGOs) processed at low temperatures (120-180 °C) were studied using X-ray absorption near-edge structure (XANES), X-ray emission spectroscopy (XES) and resonant inelastic X-ray scattering (RIXS). C K-edge XANES spectra of rGOs reveal that thermal reduction restores C = C sp2 bonds and removes some of the oxygen and hydroxyl groups of GO, which initiates the evolution of carbonaceous species. The combination of C K-edge XANES and Kα XES spectra shows that the overlapping π and π× orbitals in rGOs and GO are similar to that of highly ordered pyrolytic graphite (HOPG), which has no band-gap. C Kα RIXS spectra provide evidence that thermal reduction changes the density of states (DOSs) that is generated in the p-region and/or in the gap between the π and π× levels of the GO and rGOs. Two-dimensional C Kα RIXS mapping of the heavy reduction of rGOs further confirms that the residual oxygen and/or oxygen-containing functional groups modify the π and σ features, which are dispersed by the photon excitation energy. The dispersion behavior near the K point is approximately linear and differs from the parabolic-like dispersion observed in HOPG.
- Subjects
PHOTOLUMINESCENCE; GRAPHENE oxide; FLUORESCENCE; ELECTRONIC structure; LOW temperatures; X-ray absorption spectra; FUNCTIONAL groups
- Publication
Scientific Reports, 2014, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep04525