Musil J, Louda M, Cerstvy R, Baroch P, Ditta I B, Steele A, Foster H A
Nanoscale Res Lett. 2009 Apr;4(4):313-320. doi: 10.1007/s11671-008-9244-z. Epub 2009 Jan 27.
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 pO(2) on unheated glass substrate held on floating potential U(fl). It was found that addition of 2 at.% of Ag into TiO(2) film has no negative influence on UV-induced hydrophilicity of TiO(2) film. Thick (1,500 nm) TiO(2)/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) TiO(2)/Ag films exhibited a better UV-induced hydrophilicity compared to that of thinner (700 nm) TiO2/Ag films. Further it was found that hydrophilic TiO(2)/Ag films exhibit a strong biocidal effect under both the visible light and the UV irradiation with 100% killing efficiency of Escherichia coli ATCC 10536 after UV irradiation for 20 min. Reported results show that single layer of TiO(2) with Ag distributed in its whole volume exhibits, after UV irradiation, simultaneously two functions: (1) excellent hydrophilicity with WDCA < 10° and (2) strong power to kill E. coli even under visible light due to direct toxicity of Ag.
该文章报道了Ti-Ag-O薄膜的结构、机械、光学、光催化和杀菌性能。Ti-Ag-O薄膜是在保持浮动电位U(fl)的未加热玻璃基板上，通过由Ti/Ag复合靶材在不同氧分压pO₂下进行反应溅射沉积制备而成。研究发现，向TiO₂薄膜中添加约2 at.%的Ag对TiO₂薄膜的紫外诱导亲水性没有负面影响。含有(200)锐钛矿相的厚约1500 nm的TiO₂/Ag薄膜在紫外照射20分钟后表现出最佳亲水性，水滴接触角（WDCA）低于10°。与较薄（约700 nm）的TiO₂/Ag薄膜相比，厚约1500 nm的TiO₂/Ag薄膜表现出更好的紫外诱导亲水性。此外，研究还发现亲水性TiO₂/Ag薄膜在可见光和紫外光照射下均表现出很强的杀菌效果，在紫外照射20分钟后对大肠杆菌ATCC 10536的杀灭效率达到100%。报道结果表明，在紫外照射后，整个体积中分布有Ag的单层TiO₂同时表现出两种功能：(1) 具有WDCA < 10°的优异亲水性；(2) 由于Ag的直接毒性，即使在可见光下也具有很强的杀灭大肠杆菌的能力。
