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Title: The Effect of Thermal Reduction on the Photoluminescence and Electronic Structures of Graphene Oxides

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep04525· OSTI ID:1624700
 [1];  [1];  [1];  [2];  [2];  [2];  [3];  [4];  [1];  [5];  [5];  [6]
  1. Tamkang Univ., Taipei (Taiwan). Dept. of Physics
  2. National Taiwan Univ., Taipei (Taiwan). Dept. of Materials Science and Engineering
  3. National Univ. of Kaohsiung (Taiwan). Dept. of Applied Physics
  4. Univ. of South Africa, Johannesburg (South Africa). College of Science, Engineering and Technology. Dept. of Physics
  5. Univ. of Science and Technology of China, Hefei (China). National Synchrotron Radiation Lab.
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1624700
Journal Information:
Scientific Reports, Vol. 4, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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