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Photocatalytic properties of nc-Au/ZnO nanorod composites

Paper ID Volume ID Publish Year Pages File Format Full-Text
49145 46557 2006 7 PDF Available
Title
Photocatalytic properties of nc-Au/ZnO nanorod composites
Abstract

Photodegradation of methyl orange (MO) under 365-nm irradiation has been performed to investigate the photocatalytic activities of the nc-Au/ZnO nanorod composites in comparison with those of the ZnO nanorods and the ZnO film. The ZnO nanorods and the ZnO film were deposited on the Si substrates using chemical vapor deposition. The apparent first-order rate constant of MO photodegradation using the ZnO nanorods is two orders magnitude larger than that using the ZnO film. Photosyntheses of Au nanoparticles on the ZnO nanorods were conducted in HAuCl4/ethanol solutions under 365-nm irradiation. The diameters and the densities of the Au nanoparticles formed on the surface of ZnO nanorods are tunable through varying the HAuCl4 concentration and the irradiation period. The enhancement of the photocatalytic activity for degradation of MO is achieved by loading Au nanoparticles with sizes smaller than 15 nm on the ZnO nanorods and is more pronounced as the size of the Au nanoparticles is reduced to 5 nm. However, the photocatalytic activity of the nc-Au/ZnO nanorod composite is much lower than that of the Zn nanorods when the diameter of the nc-Au is enlarged to 30 nm. The photocatalytic activity of the nc-Au/ZnO nanorods for degradation of MO is dependent on the diameter and the density of the nc-Au.

Keywords
ZnO film; ZnO nanorods; nc-Au/ZnO nanorod composites; Photosynthesis; Methyl orange; Photocatalytic degradation
First Page Preview
Photocatalytic properties of nc-Au/ZnO nanorod composites
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 66, Issues 1–2, 20 June 2006, Pages 51–57
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis