Correlation between Electronic Structures and Photocatalytic Activities of Nanocrystalline-(Au, Ag, and Pt) Particles on the Surface of ZnO Nanorods

doi:10.1021/jp110075j

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Title:	Correlation between Electronic Structures and Photocatalytic Activities of Nanocrystalline-(Au, Ag, and Pt) Particles on the Surface of ZnO Nanorods
Authors:	Chiou, J. W.;Ray, S. C.;Tsai, H. M.;Pao, C. W.;Chien, F. Z.;Pong, W. F.;Tseng, C. H.;Wu, J. J.;Tsai, M.-H.;Chen, C.-H.;Lin, H. J.;Lee, J. F.;Guo, J.-H.
Contributors:	淡江大學物理學系
Date:	2011
Issue Date:	2011-09-30 21:58:40 (UTC+8)
Publisher:	Washington, DC: American Chemical Society
Abstract:	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.
Relation:	The Journal of Physical Chemistry C 115(6), pp.2650-2655
DOI:	10.1021/jp110075j
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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