A comparative study of the electronic structures of oxygen- and chlorine-treated nitrogenated carbon nanotubes by x-ray absorption and scanning photoelectron microscopy

S. C. Ray, C. W. Pao, H. M. Tsai, J. W. Chiou, W. F. Pong, C. W. Chen, M.-H. Tsai, P. Papakonstantinou, L. C. Chen, K. H. Chen
2007 Applied Physics Letters  
The electronic structures and bonding properties of oxygen-and chlorine-treated nitrogenated carbon nanotubes ͑N-CNTs͒ were studied using x-ray absorption near-edge structure ͑XANES͒ and scanning photoelectron microscopy. Features in the C K-edge XANES spectra are shifted by ϳ0.3 eV toward higher energies and by ϳ1.1 eV toward lower energies relatively to those of the more symmetrical pyridinelike and graphitelike structured N-CNTs upon chlorination and oxidation, respectively. Increases in N
more » ... edge XANES intensities for both chlorination and oxidation reveal substitution of C-C bonds by C-N bonds consistent with the observed valence-band photoemission spectra of the decrease of the C 2s bond and the increase of the N 2s bond.
doi:10.1063/1.2807275 fatcat:yw4b6w2lfvdztnslypb5s74xri