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    Title: The Effect of Thermal Reduction on the Photoluminescence and Electronic Structures of Graphene Oxides
    Authors: Chuang, C.-H.;Wang, Y.-F.;Shao, Y.-C.;Yeh, Y.-C.;Wang, D.-Y.;Chen, C.-W.;Chiou, J. W.;Ray, Sekhar C.;Pong, W. F.;Zhang, L.;Zhu, J. F.;Guo, J. H.
    Contributors: 淡江大學物理學系
    Keywords: Electronic properties and devices;Electronic properties and materials
    Date: 2014-03-11
    Issue Date: 2014-05-05 22:57:48 (UTC+8)
    Publisher: London: Nature Publishing Group
    Abstract: Electronic structures of graphene oxide (GO) and hydro-thermally reduced graphene oxides (rGOs)processed at low temperatures (120–1806C) 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 5 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 Ka XES spectra shows that the overlapping p and p* orbitals in rGOs and GO are similar to that of highly ordered pyrolytic graphite (HOPG), which has no band-gap. C Ka 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 p and p* levels of the GO and rGOs. Two-dimensional C Ka RIXS mapping of the heavy reduction of rGOs further confirms that the residual oxygen and/or oxygen-containing functional groups modify the p and s 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.
    Relation: Scientific Reports 4, 4525(7pages)
    DOI: 10.1038/srep04525
    Appears in Collections:[物理學系暨研究所] 期刊論文

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