A Facile Route to the Preparation of Highly Uniform ZnO@Ti[O.sub.2] Core-Shell Nanorod Arrays with Enhanced Photocatalytic Properties

Design and synthesis of ZnO@Ti[O.sub.2] core-shell nanorod arrays as promising photocatalysts have been widely reported. However, it remains a challenge to develop a low-temperature, low-cost, and environmentally friendly method to prepare ZnO@Ti[O.sub.2] core-shell nanorod arrays over a large area...

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Bibliographic Details
Published in:Journal of chemistry 2017-01, Vol.2017
Main Authors: Zhao, Yuanyuan, Tong, Peifei, Ma, Dong, Li, Bing, Liu, Qinzhuang, Chen, San, Zhang, Yongxing
Format: Article
Language:English
Subjects:
Catalysts
Chemical research
Decomposition (Chemistry)
Nanorods
Organic compounds
Synthesis
Zinc oxide
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Summary:Design and synthesis of ZnO@Ti[O.sub.2] core-shell nanorod arrays as promising photocatalysts have been widely reported. However, it remains a challenge to develop a low-temperature, low-cost, and environmentally friendly method to prepare ZnO@Ti[O.sub.2] core-shell nanorod arrays over a large area for future device applications. Here, a facile, green, and efficient route is designed to prepare the ZnO@Ti[O.sub.2] nanorod arrays with a highly uniform core-shell structure over a large area on Zn wafer via a vapor- thermal method at relatively low temperature. The growth mechanism is proposed as a layer-by-layer assembly. The photocatalytic decomposition reaction of methylene blue (MB) reveals that the ZnO@Ti[O.sub.2] core-shell nanorod arrays have excellent photocatalytic activities when compared with the performance of the ZnO nanorod arrays. The improved photocatalytic activity could be attributed to the core-shell structure, which can effectively reduce the recombination rate of electron-hole pairs, significantly increase the optical absorption range, and offer a high density of surface active catalytic sites for the decomposition of organic pollutants. In addition, it is very easy to separate or recover ZnO@Ti[O.sub.2] core-shell nanorod array catalysts when they are used in water purification processes.
ISSN:2090-9063
DOI:10.1155/2017/8579896