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采用射频反应溅射法在玻璃衬底上制得均匀透明的TiO2纳米薄膜,然后采用金(Au)离子溅射镀膜法制得金包覆TiO2复合薄膜。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)等研究了金包覆TiO2薄膜的结晶特性和表面形貌。研究显示,射频功率为200W时,射频薄膜表面光滑平整,由锐钛矿型TiO2纳米微粒构成,其微粒直径在20～100nm。Au离子溅射镀膜和真空退火后薄膜的表面形貌没有明显的变化。采用细菌涂布培养法对金掺杂TiO2纳米薄膜的光催化杀菌性能进行研究,结果表明金包覆TiO2纳米复合薄膜较单一TiO2纳米薄膜在光催化杀菌范围、速度及效率上具有明显的增强,对枯草芽孢杆菌在10min内的杀菌率均达到90%以上。根据实验结果,讨论了金包覆TiO2纳米薄膜光催化杀菌机理。
A uniform and transparent TiO2 nano-film was prepared on a glass substrate by radio frequency reactive sputtering, and then a gold-coated TiO2 composite film was obtained by gold (Au) ion sputtering. The crystalline properties and surface morphology of gold-coated TiO2 films were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The research shows that the RF film has a smooth and smooth surface when the RF power is 200W, which is composed of anatase TiO2 nanoparticles with the diameter of 20 ~ 100nm. The surface morphology of the film after Au ion sputtering and vacuum annealing showed no obvious change. The photocatalytic bactericidal activity of gold-doped TiO2nanofilm was studied by bacterial coating culture method. The results showed that the photocatalytic activity of gold-coated TiO2nanofilm was significantly enhanced compared with that of single TiO2nanofilm. The bactericidal rate of Bacillus subtilis in 10min reached more than 90%. According to the experimental results, the photocatalytic sterilization mechanism of gold-coated TiO2 nano-film was discussed.