4.7 Article

Reducing the Photocatalytic Activity of Zinc Oxide Quantum Dots by Surface Modification

Journal

JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 92, Issue 9, Pages 2083-2088

Publisher

WILEY
DOI: 10.1111/j.1551-2916.2009.03142.x

Keywords

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Funding

  1. Australian Research Council (ARC)
  2. Micronisers Pty. Ltd [LP0667830]

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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 Stober 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.

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