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International Journal of Photoenergy
Volume 2008, Article ID 168185, 11 pages
http://dx.doi.org/10.1155/2008/168185
Review Article

Biocidal Silver and Silver/Titania Composite Films Grown by Chemical Vapour Deposition

Institute for Materials Research, Salford University, Manchester, M5 4WT, UK

Received 27 March 2008; Revised 27 March 2008; Accepted 19 May 2008

Academic Editor: Russell Howe

Copyright © 2008 D. W. Sheel et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper describes the growth and testing of highly active biocidal films based on photocatalytically active films of , grown by thermal CVD, functionally and structurally modified by deposition of nanostructured silver via a novel flame assisted combination CVD process. The resulting composite films are shown to be highly durable, highly photocatalytically active and are also shown to possess strong antibacterial behaviour. The deposition control, arising from the described approach, offers the potential to control the film nanostructure, which is proposed to be crucial in determining the photo and bioactivity of the combined film structure, and the transparency of the composite films. Furthermore, we show that the resultant films are active to a range of organisms, including Gram-negative and Gram-positive bacteria, and viruses. The very high-biocidal activity is above that expected from the concentrations of silver present, and this is discussed in terms of nanostructure of the titania/silver surface. These properties are especially significant when combined with the well-known durability of CVD deposited thin films, offering new opportunities for enhanced application in areas where biocidal surface functionality is sought.