Correlation between electronic structures and photocatalytic activities of nanocrystalline-(Au, Ag, and Pt) particles on the surface of ZnO nanorods

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

研究成果: Article同行評審

75 引文 斯高帕斯(Scopus)

摘要

O K-, Au, Ag, and Pt L3-edge X-ray absorption near-edge structure (XANES), X-ray emission spectroscopy, and scanning photoelectron microscopy (SPEM) measurements have been performed to study the correlation between the electronic structures and photocatalytic activities of nanocrystalline (nc)-(Au, Ag, and Pt) particles on the surface of ZnO nanorods (ZnO-NRs). The O K-edge XANES spectra reveal greater occupation of the O 2p orbitals, i.e., a greater negative effective charge of the O ions, in nc-Pt/ZnO-NRs than of nc-(Au, Ag)/ZnO-NRs. This result suggests that nc-Pt particles have weaker photocatalytic activities than those of nc-(Au, Ag) particles on the surface of ZnO-NRs. Well-defined bandgaps of nanoparticle-coated ZnO-NRs increase in the order Au (3.3 eV) → Pt (3.5 eV) → Ag (3.6 eV), which can be correlated with an decreasing Pauling's electronegativity and a reduction of the screening effect. The valence-band SPEM measurement of nc-(Au, Ag, and Pt)/ZnO-NRs does not support the general argument that the Fermi levels of the (Au, Ag)/semiconductor composites are shifted toward the conduction-band edge relative to that of the Pt/semiconductor composite.

原文English
頁(從 - 到)2650-2655
頁數6
期刊Journal of Physical Chemistry C
115
發行號6
DOIs
出版狀態Published - 2011 二月 17

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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