The effect of thermal reduction on the photoluminescence and electronic structures of graphene oxides

doi:10.1038/srep04525

機構典藏 > College of Sciences > Graduate Institute & Department of Physics > Journal Article > Item 987654321/117029

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Title:	The effect of thermal reduction on the photoluminescence and electronic structures of graphene oxides
Authors:	CHUANG, CHENG-HAO
Date:	2014-04-10
Issue Date:	2019-09-17 12:12:25 (UTC+8)
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 π-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.
Relation:	Scientific Reports 4, p.4525
DOI:	10.1038/srep04525
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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