Preparation and antibacterial activity of Ag�?�TiO2 composite film by liquid phase deposition (LPD) method

[摘要] A liquid phase deposition (LPD) method has been devised for the deposition of Agâ€�?�TiO₂ thin films on ceramic tiles with glazed surface at a low temperature. The Agâ€�?�TiO₂ thin films obtained were welladhered, homogenous and coloured by interference of reflected light. The films were characterized by X-ray diffraction and scanning electron microscopy. From these analyses, it was found that silver ions were trapped in TiO₂ matrix and their reduction could be achieved at 600°C annealing temperature. The antibacterial activity against S. aureus and 𝐸. coli has been studied applying the so called antibacterial-drop test. The Agâ€�?�TiO₂ thin films exhibited a high antibacterial activity. AAS was used for the quantitave determination of silver ion concentration releasing from the Agâ€�?�TiO₂ thin film. The releasing rate of silver ions from the Agâ€�?�TiO₂ film was 0.118 𝜇g/ml during 192 h. The antibacterial effect of Agâ€�?�TiO₂ thin film before and after aging in a weathering chamber for 48 h was compared and the results show that the antibacterial activity is not compromised after weathering.

[学科分类] 材料工程

[关键词] Agâ€�?�TiO2 thin films;liquid phase deposition method;antibacterial activity.