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    Title: Charge transfer in nanocrystalline-Au/ZnO nanorods investigated by x-ray spectroscopy and scanning photoelectron microscopy
    Authors: Chiou, J. W.;Ray, S. C.;Tsai, H. M.;Pao, C. W.;Chien, F. Z.;Pong, W. F.
    Contributors: 淡江大學物理學系
    Keywords: charge exchange;gold;zinc compounds;II-VI semiconductors;nanostructured materials;XANES;photoelectron microscopy;particle size;valence bands;conduction bands
    Date: 2007-05
    Issue Date: 2010-08-10 09:47:06 (UTC+8)
    Publisher: College Park: American Institute of Physics (AIP)
    Abstract: O K- and Zn and Au L3-edge x-ray absorption near-edge structure (XANES), x-ray emission spectroscopy (XES), and scanning photoelectron microscopy (SPEM) are performed to investigate the electronic structure of ZnO nanorods with nanocrystalline (nc)-Au particles grown on the surfaces. The XANES spectra of nc-Au/ZnO nanorods reveal the decrease of the number of both O 2p and Zn 4s/3d unoccupied states with the increase of the nc-Au particle size. The number of Au 6s/5d unoccupied states increases when the size of nc-Au particle decreases, indicating that the deposition of nc-Au particles on the surface of ZnO nanorods promotes charge transfer from the ZnO nanorods to nc-Au particles. Excitation energy dependent XES and SPEM spectra show that the number of electrons in the valence band of O 2p-Zn 4sp hybridized states decreases as the nc-Au particle size increases, revealing that more electrons are excited from the valence band to the conduction band of ZnO nanorods and the storage of electrons in nc-Au particles.
    Relation: Applied Physics Letters 90(19), pp.192112(3 pages)
    DOI: 10.1063/1.2738369
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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