Nanotech 2007 Vol. 1
Nanotech 2007 Vol. 1
Technical Proceedings of the 2007 NSTI Nanotechnology Conference and Trade Show, Volume 1

Nanostructured Materials and Devices Chapter 5

Photoactive titania and nanoparticulate silver-titania composite thin films as potent antimicrobial coatings

Authors: K. Page, I.P. Parkin and M. Wilson

Affilation: University College London, United Kingdom

Pages: 356 - 359

Keywords: titania, photocatalyst, antimicrobial

Abstract:
Nanocrystalline 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, XANES, Raman, SEM/WDX, XPS and UV visible techniques and shown to consist of anatase with ca 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 antimicrobial 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.

Photoactive titania and nanoparticulate silver-titania composite thin films as potent antimicrobial coatings

ISBN: 1-4200-6182-8
Pages: 726
Hardcopy: $139.95