Photoinduced Bactericidal Properties of Nanocrystalline TiO₂ Thin Films

Authors: Subba Rao, Kambala V.; Zhuo, Beixiang; Cox, Julian M.; Chiang, Ken; Brungs, Mike; Amal, Rose

Source: Journal of Biomedical Nanotechnology, Volume 2, Number 1, April 2006 , pp. 71-73(3)

Publisher: American Scientific Publishers

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Abstract:

Transparent anatase TiO₂ nanometer thin films were prepared by dip-coating on soda-lime glass plates via the sol-gel method. The as prepared films and the heat treated films were characterized by X-ray diffraction (XRD), UV-Vis spectrometry, thickness and hydrophilicity (contact angle measurements). The photocatalytic activity of the thin films was evaluated by performing disinfection studies on a Gram-negative microorganism Escherichia coli. The activity of the sol-gel prepared TiO₂ thin films was compared under UV lamps and natural day light (ND) lamps with P-25 thin films prepared on soda-lime glass with a polymer support and a commercial self-cleaning glass. It was found that the sol-gel prepared thin films annealed at 450 C not only showed the highest photocatalytic activiy, it also possessed light-induced hydrophilicity, exhibited the slowest conversion rate from a hydrophilic to a hydrophobic state and had higher disinfection activities compared to P-25 films and commercial self-cleaning glass.

Keywords: PHOTOCATALYSIS; DISINFECTION; TITANIA FILMS; E. COLI

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jbn.2006.006

Publication date: 2006-04-01

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Journal of Biomedical Nanotechnology (JBN) is a peer-reviewed multidisciplinary journal providing broad coverage in all research areas focused on the applications of nanotechnology in medicine, drug delivery systems, infectious disease, biomedical sciences, biotechnology, and all other related fields of life sciences.
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