Preparation of TiO₂ thin film and its antibacterial activity

Abstract

TiO₂ nanometer thin films with photocatalytic antibacterial activity were prepared by the sol-gel method on fused quartz and soda lime glass precoated with a SiO₂ layer. The thin films were characterized by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The results show that sodium and calcium diffusion into nascent TiO₂ film is effectively retarded by the SiO₂ layer precoated on the soda lime glass. The antibacterial activity of the films was determined. The crystalline of TiO₂ nanometer thin film has important effects on the antibacterial activity of the film.

Keywords

sol-gel method / thin films / titanium dioxide / antibacterial activity

References

[1] Sawai J. Quantitative Evaluation of antibacterial Activities of Metallic Oxide Powder (ZnO, MgO and CuO) by Conductive Essay. J. Microbiological Methods, 2003, 54: 177-182.

[2] Okoucki S, Murata R, Sugita H, . Calorimetric evaluation of the antimicrobial activity of calcined dolomite. J. Antifungal. Agents, 1995, 26: 109-114.

[3] Wilczynski M. Anti-microbal Porcelain Enamels. Ceram. Eng. Sci. Proc., 2000, 21: 81-83.

[4] Kourai H. Immobilized Microbiocide. J. Antibact. Antifungal Agents, 1993, 21: 331-337.

[5] Kawahara K, Tsuruda K, Morishita M, . Antibacterial Effect of Silver—zeolite on Oral Bacteria Under Anaeobic Conditions. Dental Material, 2000, 16: 452-455.

[6] Fujisha A, Honda K. Electrochemical Photolysis of Water at Semiconductor Elecerode. Natccrt, 1972, 238: 37-38.

[7] Fujishima A, Rao N, Tata A,et al. Titanium Dioxide Photocatalysis. J. Photochem. Photobid, C: Photochem. Rev., 2000, 1–21

[8] Matsunaga T, Tornada R, Nakajima T, . Photochemical Sterilization of Microbal Cells by Semiconductive Powders. Fems Microbiol. Lett., 1985, 29: 211-214.

[9] Pin-ching M, Smdinski S, Blake D, . Bacteriaidal Activity of Photocatalytic TiO₂ Reaction: Toward an Understanding of Its Killing Mechanism. Appl. Environ. Microbiol., 1999, 65: 4094-4098.

[10] Yu Jiaguo, Zhao Xiujian, Zhao Qingnan. Effect of Surface Structure on Photocatalytic Activity of TiO₂ Thin Films Prepared by Sol—gel Method. Thin Solid Films, 2000, 379: 7-14.