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

Abstract

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.

Authors:
 [1];  [2];  [2];  [3];  [3];  [3];  [4];  [5];  [5];  [5];  [5];  [6];  [1]
  1. Tamkang Univ., Taipei (Taiwan). Dept. of Physics
  2. Univ. of South Afric, Johannesburg (South Africa). Dept. of Physics
  3. Ulster Univ., Newtownabbey (United Kingdom). Engineering Research Inst.
  4. National Univ. of Kaohsiung (Taiwan). Dept. of Applied Physics
  5. National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source; Univ. of California, Santa Cruz, CA (United States). Dept. of Chemistry and Biochemistry
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1379732
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; electronic properties and devices

Citation Formats

Chuang, Cheng-Hao, Ray, Sekhar C., Mazumder, Debarati, Sharma, Surbhi, Ganguly, Abhijit, Papakonstantinou, Pagona, Chiou, Jau-Wern, Tsai, Huang-Ming, Shiu, Hung-Wei, Chen, Chia-Hao, Lin, Hong-Ji, Guo, Jinghua, and Pong, Way-Faung. Chemical Modification of Graphene Oxide by Nitrogenation: An X-ray Absorption and Emission Spectroscopy Study. United States: N. p., 2017. Web. doi:10.1038/srep42235.
Chuang, Cheng-Hao, Ray, Sekhar C., Mazumder, Debarati, Sharma, Surbhi, Ganguly, Abhijit, Papakonstantinou, Pagona, Chiou, Jau-Wern, Tsai, Huang-Ming, Shiu, Hung-Wei, Chen, Chia-Hao, Lin, Hong-Ji, Guo, Jinghua, & Pong, Way-Faung. Chemical Modification of Graphene Oxide by Nitrogenation: An X-ray Absorption and Emission Spectroscopy Study. United States. doi:10.1038/srep42235.
Chuang, Cheng-Hao, Ray, Sekhar C., Mazumder, Debarati, Sharma, Surbhi, Ganguly, Abhijit, Papakonstantinou, Pagona, Chiou, Jau-Wern, Tsai, Huang-Ming, Shiu, Hung-Wei, Chen, Chia-Hao, Lin, Hong-Ji, Guo, Jinghua, and Pong, Way-Faung. Fri . "Chemical Modification of Graphene Oxide by Nitrogenation: An X-ray Absorption and Emission Spectroscopy Study". United States. doi:10.1038/srep42235. https://www.osti.gov/servlets/purl/1379732.
@article{osti_1379732,
title = {Chemical Modification of Graphene Oxide by Nitrogenation: An X-ray Absorption and Emission Spectroscopy Study},
author = {Chuang, Cheng-Hao and Ray, Sekhar C. and Mazumder, Debarati and Sharma, Surbhi and Ganguly, Abhijit and Papakonstantinou, Pagona and Chiou, Jau-Wern and Tsai, Huang-Ming and Shiu, Hung-Wei and Chen, Chia-Hao and Lin, Hong-Ji and Guo, Jinghua and Pong, Way-Faung},
abstractNote = {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.},
doi = {10.1038/srep42235},
journal = {Scientific Reports},
number = ,
volume = 7,
place = {United States},
year = {2017},
month = {2}
}

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