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    題名: Nitrogen-doped Carbon Spheres: An X-ray Absorption Near-edge Structure Spectroscopy Study
    作者: Sekhar C. Ray;Zikhona N. Tetana;Rudolph Erasmus;Pong, Way-Faung;Neil J. Coville
    貢獻者: 淡江大學物理學系
    日期: 2013-08-09
    上傳時間: 2014-03-19 17:03:50 (UTC+8)
    出版者: Heidelberg: Springer
    摘要: 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.
    關聯: Applied Physics A 115(1), pp.153-157
    DOI: 10.1007/s00339-013-7853-6
    顯示於類別:[物理學系暨研究所] 期刊論文

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