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

被引：76

作者：

Chiou, J. W. ^{[2
]}

Ray, S. C. ^{[1
,3
]}

Tsai, H. M. ^{[1
]}

Pao, C. W. ^{[1
,4
]}

Chien, F. Z. ^{[1
]}

Pong, W. F. ^{[1
]}

Tseng, C. H. ^{[5
]}

Wu, J. J. ^{[5
]}

Tsai, M. -H. ^{[6
]}

Chen, C. -H. ^{[4
]}

Lin, H. J. ^{[4
]}

Lee, J. F. ^{[4
]}

Guo, J. -H. ^{[7
]}

机构：

[1] Tamkang Univ, Dept Phys, Tamsui 251, Taiwan

[2] Natl Univ Kaohsiung, Dept Appl Phys, Kaohsiung 811, Taiwan

[3] Univ Witwatersrand, Sch Phys, ZA-2050 Wits, Johannesburg, South Africa

[4] Natl Synchrotron Radiat Res Ctr, Hsinchu 300, Taiwan

[5] Natl Cheng Kung Univ, Dept Chem Engn, Tainan 701, Taiwan

[6] Natl Sun Yat Sen Univ, Dept Phys, Kaohsiung 804, Taiwan

[7] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 06期

关键词：

FERMI-LEVEL EQUILIBRATION; SCANNING PHOTOELECTRON MICROSCOPY; RAY-ABSORPTION SPECTROSCOPY; NANOSTRUCTURED MATERIALS; AU NANOPARTICLES;

D O I：

10.1021/jp110075j

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

O K-, Au, Ag and Pt L-3-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.

引用

页码：2650 / 2655

页数：6

共 19 条

[1] Applications of Ultrasound to the Synthesis of Nanostructured Materials [J].