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Photoconduction and the electronic structure of silica nanowires embedded with gold nanoparticles

机译:嵌入金纳米粒子的二氧化硅纳米线的光电导和电子结构

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摘要

Silica nanowires (SiO_x-NWs) embedded with Au peapods have been studied by energy-filtered scanning transmission electron microscopy (EFTEM), O K- and Au L_3-edge x-ray absorption near-edge structure (XANES), and extended x-ray absorption fine structure (EXAFS), x-ray emission spectroscopy (XES) and scanning photoelectron microscopy. XANES and XES data show that band gaps of Au-peapod-embedded and pure SiO_x-NWs were 6.8 eV. In additional, XANES and EXAFS results indicate illumination-induced electron transfer from Au peapod to SiO_x-NWs and does not show any feature attributable to the formation of Au-Si bonding in the Au peapod embedded in SiO_x-NWs with or without illumination. Photoresponse and EFTEM measurements show that green light has more significant enhancement of photoconductivity than red and blue light due to surface plasmon resonance and suggest that transport of electrons across SiCVNWs is via Mott-variable-range hopping mechanism through localized or defect states.
机译:已通过能量过滤扫描透射电子显微镜(EFTEM),O K和Au L_3边缘x射线吸收近边缘结构(XANES)以及扩展x-射线对嵌入金豆荚的二氧化硅纳米线(SiO_x-NWs)进行了研究。射线吸收精细结构(EXAFS),X射线发射光谱(XES)和扫描光电子显微镜。 XANES和XES数据表明,嵌入金-豌豆足和纯SiO_x-NWs的带隙为6.8 eV。另外,XANES和EXAFS结果表明光照诱导的电子从金豌豆脚向SiO_x-NWs的转移,并且没有显示任何归因于埋入SiO_x-NWs中的金豌豆中形成Au-Si键的特征,无论有无光照。光响应和EFTEM测量表明,由于表面等离子体激元共振,绿光比红光和蓝光具有更大的光电导性增强,并表明电子在SiCVNW上的传输是通过局部或缺陷状态的Mott可变范围跳变机制进行的。

著录项

  • 来源
    《Physical review》 |2011年第16期|p.165412.1-165412.8|共8页
  • 作者单位

    Department of Physics, Tamkang University, Tamsui 251, Taiwan;

    Department of Material Science and Engineering, National Taiwan University, Taipei 106, Taiwan;

    Department of Physics, Tamkang University, Tamsui 251, Taiwan;

    Department of Physics, Tamkang University, Tamsui 251, Taiwan;

    Department of Physics, Tamkang University, Tamsui 251, Taiwan;

    Department of Physics, Tamkang University, Tamsui 251, Taiwan;

    Department of Applied Physics, National University of Kaohsiung, Kaohsiung 811, Taiwan;

    Department of Material Science and Engineering, National Taiwan University, Taipei 106, Taiwan;

    Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan;

    Center for Condensed Matter Sciences, National Taiwan University, Taipei 106, Taiwan;

    Center for Condensed Matter Sciences, National Taiwan University, Taipei 106, Taiwan;

    Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan,Center for Condensed Matter Sciences, National Taiwan University, Taipei 106, Taiwan;

    Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan,Center for Condensed Matter Sciences, National Taiwan University, Taipei 106, Taiwan;

    Center for Condensed Matter Sciences, National Taiwan University, Taipei 106, Taiwan,Institute of Microelectronics and Department of Electrical Engineering, National Cheng Kung University, Tainan 701, Taiwan;

    Institute of Microelectronics and Department of Electrical Engineering, National Cheng Kung University, Tainan 701, Taiwan;

    Department of Physics, National Sun Yat-Sen University, Kaohsiung 804, Taiwan;

    National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan;

    National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan;

    Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    X-ray absorption spectra; collective excitations (including excitons, polarons, plasmons and other charge-density excitations); electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals; nanocrystals and nanoparticles;

    机译:X射线吸收光谱;集体激发(包括激子;极化子;等离激元和其他电荷密度激发);纳米级材料的电子结构:团簇;纳米粒子;纳米管和纳米晶体;纳米晶体和纳米粒子;

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