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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/97406

    Title: Nitrogen-doped Carbon Spheres: An X-ray Absorption Near-edge Structure Spectroscopy Study
    Authors: Sekhar C. Ray;Zikhona N. Tetana;Rudolph Erasmus;Pong, Way-Faung;Neil J. Coville
    Contributors: 淡江大學物理學系
    Date: 2013-08-09
    Issue Date: 2014-03-19 17:03:50 (UTC+8)
    Publisher: Heidelberg: Springer
    Abstract: Carbon spheres (CSs) and low content nitrogen (2.5 and 3.5 at%) doped carbon spheres (NCSs) were synthesized by a pyrolysis process at 900 °C using C2H2 and CH3CN. The electronic structure and chemical bonding of CSs and NCSs were studied using Raman spectroscopy, valence-band photoemission spectroscopy (VBPES) and X-ray absorption near-edge structure spectroscopy (XANES). XANES spectroscopy showed the effect of carbon and nitrogen bonds and graphitic as well as pyridinic structures on the NCS structure. For the spheres VBPES showed the effect of nitrogen on the spectral shape of the density of states and confirmed the role played by the π bonds in controlling the electronic and structural properties of the NCSs. VBPES also showed that both π and σ bands shift towards higher binding energies after N-doping which is consistent with the XANES data. The consistency of the spherical geometry, chemical purity, suitable electronic/bonding structure and the availability of macroscopic quantities of the N–CSs makes these spheres promising new materials for different applications.
    Relation: Applied Physics A 115(1), pp.153-157
    DOI: 10.1007/s00339-013-7853-6
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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