淡江大學機構典藏:Item 987654321/96243
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    題名: Electronic structure study of ordering and interfacial interaction in graphene/Cu composites
    作者: Zhang, Liang;Elad Pollakc;Wang, Wei-Cheng;Jiang, Peng;Per-Anders Glans;Zhang, Yuegang;Jordi Cabana;Robert Kostecki;Chang, Chinglin;Miquel Salmeron;Zhu, Junfa;Guo, Jinghua
    貢獻者: 淡江大學物理學系暨研究所
    日期: 2012-11
    上傳時間: 2014-03-06 16:34:20 (UTC+8)
    出版者: Kidlington: Pergamon
    摘要: Graphene CVD-grown on Cu has been studied using Raman spectroscopy, X-ray absorption spectroscopy (XAS) and X-ray emission spectroscopy (XES). Raman data indicate the presence of weak compressive strain at the interface of graphene/Cu. Compared with highly ordered pyrolytic graphite (HOPG), new electronic states in the conduction band are observed for graphene/Cu, which are mainly ascribed to the defect states and interfacial interaction between the single graphene layer and Cu surface. Moreover, polarization dependent XAS measurements demonstrate that the graphene/Cu exhibits a high degree of alignment and weak corrugation on the surface. Significant intensity modulation in the resonant XES spectral shape upon different excitation energies near the C K-edge indicates that graphene layer preserves an intrinsic momentum as that of HOPG and the interaction between graphene and Cu shows weak influence on the valence band structure of graphene. However, broad inelastic features and subtle peak shifts are observed in the resonant XES spectra of graphene/Cu in comparison of HOPG, which can be mainly attributed to the electron–phonon scattering and charge transfer from the interfacial interaction of graphene and Cu substrate.
    關聯: Carbon 50(14), pp.5316–5322
    DOI: 10.1016/j.carbon.2012.07.020
    顯示於類別:[物理學系暨研究所] 期刊論文

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