Reducing the photocatalytic activity of zinc oxide quantum dots by surface modification

Wang, Jinfeng, Tsuzuki, Takuya, Sun, Lu and Wang, Xungai 2009, Reducing the photocatalytic activity of zinc oxide quantum dots by surface modification, Journal of the American ceramic society, vol. 92, no. 9, pp. 2083-2088.

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Title Reducing the photocatalytic activity of zinc oxide quantum dots by surface modification
Author(s) Wang, Jinfeng
Tsuzuki, Takuya
Sun, Lu
Wang, Xungai
Journal name Journal of the American ceramic society
Volume number 92
Issue number 9
Start page 2083
End page 2088
Publisher Wiley Interscience
Place of publication New York, N. Y.
Publication date 2009-09
ISSN 0002-7820
1551-2916
Keyword(s) nanoparticles
ZnO
photocatalysis
quantum dots
surfaace modification
Summary The use of zinc oxide (ZnO) nanoparticles as ultraviolet (UV) absorbers for many organic substrates is limited because of the high photocatalytic activity of ZnO. In this study, a facile and efficient technique for the preparation of a hybrid material of silica-coated ZnO nanoparticles was used to reduce the photocatalytic activity of ZnO. Monodispersed ZnO nanopartcles were prepared by wet chemistry and the particle surface was modified by tetraethylorthosilicate to form a silica coating via the Sto¨ ber method. ZnO samples, both before and after the coating process, were investigated by transmission electron microscopy, X-ray diffraction, dynamic light scanning, infrared, and UV-Vis absorption spectroscopy. The effect of the surface modification on the photocatalytic activity of ZnO was studied by monitoring the degradation of Rhodamine B caused by photo-generated free radicals. The results implied that the photo-generation of free-radicals was strongly quenched by the presence of silica on the particle surface.
Language eng
Field of Research 100708 - Nanomaterials
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2009
Copyright notice ©2009, Deakin University
Persistent URL http://hdl.handle.net/10536/DRO/DU:30020681

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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Created: Wed, 21 Oct 2009, 15:54:32 EST by Takuya Tsuzuki

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