Effect of particle size on the photocatalytic activity of nanoparticulate zinc oxide

Dodd, A. C., McKinley, A. J., Saunders, M. and Tsuzuki, T. 2006, Effect of particle size on the photocatalytic activity of nanoparticulate zinc oxide, Journal of nanoparticle research, vol. 8, no. 1, pp. 43-51.

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Title Effect of particle size on the photocatalytic activity of nanoparticulate zinc oxide
Author(s) Dodd, A. C.
McKinley, A. J.
Saunders, M.
Tsuzuki, T.
Journal name Journal of nanoparticle research
Volume number 8
Issue number 1
Start page 43
End page 51
Publisher Springer Netherlands
Place of publication Dordrecht, Netherlands
Publication date 2006-02
ISSN 1388-0764
1572-896X
Keyword(s) mechanochemical processing
nanoparticles
photocatalysis
zinc oxide
colloids
Summary In this study, a three-stage process consisting of mechanical milling, heat treatment, and washing has been used to manufacture nanoparticulate ZnO powders with a controlled particle size and minimal agglomeration. By varying the temperature of the post-milling heat treatment, it was possible to control the average particle size over the range of 28–57 nm. The photocatalytic activity of these powders was characterized by measuring the hydroxyl radical concentration as a function of irradiation time using the spin-trapping technique with electron paramagnetic resonance spectroscopy. It was found that there exists an optimum particle size of approximately 33 nm for which the photocatalytic activity is maximized. The existence of this optimal particle size is attributable to an increase in the charge carrier recombination rate, which counteracts the increased activity arising from the higher specific surface area for a sufficiently small particle size.
Language eng
Field of Research 100708 Nanomaterials
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2006, Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30022528

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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