Study on the Nanostructural TiO2 Thin Film by Oxidation-Hydrothermal Method

• Main Authors: Zih-Yu Chen, 陳姿宇
• Other Authors: Yi Hu
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/97728427667439854998

碩士 === 大同大學 === 材料工程學系(所) === 96 === Titanium dioxide photocatalyst is well developed and wildly used due to its safety, highly catalytic activity, and self-cleaning properties. However, recycling of TiO2 powder is difficult. This motivates the development of TiO2 thin-films processes to extend its application. In this study, Mesoporous TiO2 thin films on stainless steel substrate were prepared by hydrothermal – oxidation of titanium metal thin films which were obtained by DC magnetron sputter technique. Gold nanoparticals prepared by reduction of HAuCl4 were embedded into the holes of the mesoporous TiO2 films by capillary method. The size of hole of TiO2 films is about 100nm and that of Au nanoparticales is 20nm in average. The morphology of the films was analyzed by Field-Emission Scanning Electron Microscope and Scanning Probe Microscopes. The contact angle of the water drop on the thin films was measured. The photocatalystic effect was investigated by the degradation of methylene blue solution. Experimental results show that the deposited films with Anatase structure exhibit the higher photocatalytic efficiency. Photocatalytic efficiency increases with the fraction of anatase phase in TiO2 films. Crystallinity of TiO2 films is affected by annealing temperature, so that higher photocatalysis efficiency is obtained.