Charge transfer in nanocrystalline- AuZnO nanorods investigated by x-ray spectroscopy and scanning photoelectron microscopy

J. W. Chiou, S. C. Ray, H. M. Tsai, C. W. Pao, F. Z. Chien, W. F. Pong, M. H. Tsai, J. J. Wu, C. H. Tseng, C. H. Chen, J. F. Lee, J. H. Guo

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27 Citations (Scopus)

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-AuZnO nanorods reveal the decrease of the number of both O 2p and Zn 4s3d unoccupied states with the increase of the nc-Au particle size. The number of Au 6s5d 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.

Original languageEnglish
Article number192112
JournalApplied Physics Letters
Volume90
Issue number19
DOIs
Publication statusPublished - 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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