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Open Access Nano Express

Two-Functional Direct Current Sputtered Silver-Containing Titanium Dioxide Thin Films

J Musil1*, M Louda1, R Cerstvy1, P Baroch1, IB Ditta2, A Steele2 and HA Foster2

Author Affiliations

1 Department of Physics, Faculty of Applied Sciences, University of West Bohemia, Univerzitní 22, 306-14, Plzeň, Czech Republic

2 Biomedical Sciences Research Institute, University of Salford, Salford, M5 4WT, UK

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Nanoscale Research Letters 2009, 4:313-320  doi:10.1007/s11671-008-9244-z

Published: 27 January 2009

Abstract

The article reports on structure, mechanical, optical, photocatalytic and biocidal properties of Ti–Ag–O films. The Ti–Ag–O films were reactively sputter-deposited from a composed Ti/Ag target at different partial pressures of oxygen on unheated glass substrate held on floating potentialUfl. It was found that addition of ~2 at.% of Ag into TiO2film has no negative influence on UV-induced hydrophilicity of TiO2film. Thick (~1,500 nm) TiO2/Ag films containing (200) anatase phase exhibit the best hydrophilicity with water droplet contact angle (WDCA) lower than 10° after UV irradiation for 20 min. Thick (~1,500 nm) TiO2/Ag films exhibited a better UV-induced hydrophilicity compared to that of thinner (~700 nm) TiO2/Ag films. Further it was found that hydrophilic TiO2/Ag films exhibit a strong biocidal effect under both the visible light and the UV irradiation with 100% killing efficiency ofEscherichia coliATCC 10536 after UV irradiation for 20 min. Reported results show that single layer of TiO2with Ag distributed in its whole volume exhibits, after UV irradiation, simultaneously two functions: (1) excellent hydrophilicity with WDCA < 10° and (2) strong power to killE. colieven under visible light due to direct toxicity of Ag.

Keywords:
TiO2; Ag addition; Mechanical properties; Hydrophilicity; Biocidal activity; Sputtering