Please use this identifier to cite or link to this item: https://doi.org/10.1088/0957-4484/21/18/185606
Title: Synthesis of ZnO-Pt nanoflowers and their photocatalytic applications
Authors: Yuan, J.
Choo, E.S.G.
Tang, X. 
Sheng, Y.
Ding, J. 
Xue, J. 
Issue Date: 2010
Citation: Yuan, J., Choo, E.S.G., Tang, X., Sheng, Y., Ding, J., Xue, J. (2010). Synthesis of ZnO-Pt nanoflowers and their photocatalytic applications. Nanotechnology 21 (18) : -. ScholarBank@NUS Repository. https://doi.org/10.1088/0957-4484/21/18/185606
Abstract: The photocatalytic behaviors of ZnO nanoparticles have been intensively studied recently. However, the photocatalytic efficiency of pure ZnO nanoparticles always suffers from the quick recombination of photoexcited electrons and holes. In order to suppress the electron-hole recombination and then raise the photocatalytic efficiency of ZnO, metal nanoparticles have been combined with ZnO to form ZnO-metal heterostructures. In this work, the feasibility of synthesizing ZnO-Pt composite nanoflowers for optimized catalytic properties was studied. Three different Pt nanocrystals, i.e.cubic Pt nanocrystals enclosed by {100} facets, octahedral Pt nanocrystals enclosed by {111} facets, and truncated octahedral Pt nanocrystals enclosed by both {111} and {100} facets, were selected as seeds for epitaxial growth of ZnO. A ZnO-Pt flowerlike nanostructure was formed by selective growth of ZnO nanolobes at {111} facets of the truncated octahedral Pt nanocrystals. The resultant nanoflowers had well defined ZnO-Pt interfaces and exposed Pt {100} facets, as confirmed by transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) measurements. The photocatalytic behaviors of the resultant ZnO-Pt nanoflowers were demonstrated in the photodegradation of ethyl violet. In comparison with the commercial TiO2 photocatalyst P25, the ZnO-Pt flowerlike nanostructures showed improved catalytic efficiency. Notable ferromagnetism of the obtained ZnO-Pt flowerlike nanostructures was also observed. It is believed that the ZnO-Pt interface played an important role in the enlarged magnetic coercivity of the ZnO-Pt nanoflowers. © 2010 IOP Publishing Ltd.
Source Title: Nanotechnology
URI: http://scholarbank.nus.edu.sg/handle/10635/86770
ISSN: 09574484
DOI: 10.1088/0957-4484/21/18/185606
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