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Chemical Modification of Graphene Oxide by Nitrogenation [electronic resource] : An X-ray Absorption and Emission Spectroscopy Study

Published
Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2017.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
Article numbers 42,235 : digital, PDF file
Additional Creators
Lawrence Berkeley National Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Nitrogen-doped graphene oxides (GO:N x) were synthesized by a partial reduction of graphene oxide (GO) using urea [CO(NH 2) 2 ]. Their electronic/bonding structures were investigated using X-ray absorption near-edge structure (XANES), valence-band photoemission spectroscopy (VB-PES), X-ray emission spectroscopy (XES) and resonant inelastic X-ray scattering (RIXS). During GO:N x synthesis, different nitrogen-bonding species, such as pyrrolic/graphitic-nitrogen, were formed by replacing of oxygen-containing functional groups. At lower N-content (2.7 at%), pyrrolic-N, owing to surface and subsurface diffusion of C, N and NH is deduced from various X-ray spectroscopies. In contrast, at higher N-content (5.0 at%) graphitic nitrogen was formed in which each N-atom trigonally bonds to three distinct sp 2 -hybridized carbons with substitution of the N-atoms for C atoms in the graphite layer. Upon nitrogen substitution, the total density of state close to Fermi level is increased to raise the valence-band maximum, as revealed by VB-PES spectra, indicating an electron donation from nitrogen, molecular bonding C/N/O coordination or/and lattice structure reorganization in GO:N x . The well-ordered chemical environments induced by nitrogen dopant are revealed by XANES and RIXS measurements.
Report Numbers
E 1.99:1379732
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Note
Published through SciTech Connect.
02/10/2017.
"ark:/13030/qt9089f312"
Scientific Reports 7 ISSN 2045-2322 AM
Cheng-Hao Chuang; Sekhar C. Ray; Debarati Mazumder; Surbhi Sharma; Abhijit Ganguly; Pagona Papakonstantinou; Jau-Wern Chiou; Huang-Ming Tsai; Hung-Wei Shiu; Chia-Hao Chen; Hong-Ji Lin; Jinghua Guo; Way-Faung Pong.
Funding Information
AC02-05CH11231
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