Nano Science and Technology Institute
Nanotech 2004 Vol. 3
Nanotech 2004 Vol. 3
Technical Proceedings of the 2004 NSTI Nanotechnology Conference and Trade Show, Volume 3
Chapter 8: Nano Particles and Molecules

Controlling the Photoactivity of Nanoparticles

Authors:P. Casey, S. Boskovic, K. Lawrence and T. Turney
Affilation:CSIRO(CMIT), AU
Pages:370 - 374
Keywords:nanoparticles, photoactivity, doped, zinc oxide
Abstract:The relative photoactivity of a series of nanophase ZnO powders with varying crystallite size (20-140nm) was determined using a chemical method based on the photobleaching behaviour of the stable radical 1,1-diphenyl-2-picrylhydrazyl (DPPH). It was confirmed that photoactivity behaviour increased (one to twofold) with decreasing crystallite size for crystallites <100nm. A further series of nanophase ZnO powders doped with metal ions showed that, depending on the type and/or level of dopant, the photoactivity behaviour of nanoparticles could be reduced by more than an order of magnitude.
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