Titania and silver-titania composite films on glass-potent antimicrobial coatings

Page, Kristopher and Palgrave, Robert G. and Parkin, Ivan P. and Wilson, Michael and Savin, Shelly L. P. and Chadwick, Alan V. (2007) Titania and silver-titania composite films on glass-potent antimicrobial coatings. Journal of Materials Chemistry, 17 (1). pp. 95-104. ISSN 0959-9428. (Access to this publication is restricted)

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http://dx.doi.org/10.1039/b611740f

Abstract

Titania (anatase) and Ag-doped titania (anatase) coatings were prepared on glass microscope slides by a sol - gel dip-coating method. The resultant coatings were characterised by X-ray diffraction, X-ray absorption near edge structure (XANES), Raman, scanning electron microscopy (SEM), wavelength dispersive X-ray (WDX) analysis, X-ray photoelectron spectroscopy (XPS) and UV-vis techniques and shown to consist of anatase with ca. 0.2 - 1 atom% Ag2O. Photocatalytic activity of the coatings was determined by photomineralisation of stearic acid, monitored by FT-IR spectroscopy. Photocatalytically-active coatings were screened for their antibacterial efficacy against Staphylococcus aureus (NCTC 6571), Escherichia coli ( NCTC 10418) and Bacillus cereus (CH70-2). Ag-doped titania coatings were found to be significantly more photocatalytically and antimicrobially active than a titania coating. No antimicrobial activity was observed in the dark - indicating that silver ion diffusion was not the mechanism for antimicrobial action. The mode of action was explained in terms of a charge separation model. The coatings also demonstrated significantly higher activity against the Gram-positive organisms than against the Gram-negative. The Ag2O - TiO2 coating is a potentially useful coating for hard surfaces in a hospital environment due to its robustness, stability to cleaning and reuse, and its excellent antimicrobial response.

Item Type: Article
Subjects: Q Science > QD Chemistry
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Depositing User: Suzanne Duffy
Date Deposited: 19 Dec 2007 17:43
Last Modified: 16 Jul 2014 09:18
Resource URI: http://kar.kent.ac.uk/id/eprint/2194 (The current URI for this page, for reference purposes)
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