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

doi:10.1038/srep42235

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題名:	Chemical Modification of Graphene Oxide by Nitrogenation: An X-ray Absorption and Emission Spectroscopy Study
作者:	Chuang, C.-H.;Ray, S.C.;Mazumder, D.;Sharma, S.;Ganguly, A.;Papakonstantinou, P.;Chiou, J.-W.;Tsai, H.-M.;Shiu, H.-W.;Chen, C.-H.;Lin, H.-J.;Guo, J.;Pong, W.-F.
日期:	2017-02-10
上傳時間:	2018-11-08 12:11:32 (UTC+8)
出版者:	Nature Publishing Group
摘要:	Nitrogen-doped graphene oxides (GO:Nx) were synthesized by a partial reduction of graphene oxide (GO) using urea [CO(NH2)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:Nx 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 sp2-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:Nx. The well-ordered chemical environments induced by nitrogen dopant are revealed by XANES and RIXS measurements.
關聯:	Scientific Reports 7, 42235
DOI:	10.1038/srep42235
顯示於類別:	[物理學系暨研究所] 期刊論文

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