| Summary: | 碩士 === 國立高雄第一科技大學 === 電機工程研究所碩士班 === 104 === Since the physical and chemical stability and superhydrophilic properties of titanium dioxide, it is more suitable as a photocatalyst compare to other semiconductor materials. It can be widely used in water purification, pollution prevention, anti -bacterial and other related applications. Because the photocatalyst effectiveness is limited by the grain size , it will has excellent surface energy, if the grain size of the titanium dioxide is reduced to nanoscale.
And this experiment was to sputter a effective nano photocatalytic titanium dioxide thin films on nano porous anodic aluminum oxide membrane by using controlled the chamber pressure. Finally the annealed films will be examined the characteristics of surface morphology, crystalline structure and photo degradation efficacy .
In this study, surface morphology of titanium dioxide has be changed by using two-step anodized aluminum oxide membrane. Mixing phosphoric acid and chromium acid was find to be the most suitable etchant. It removel one-step anodized aluminum oxide without etching of bottom aluminum substrate. The nano-porous anodic aluminum oxide pore arrays, obtained by two-step anodization is subsequently used to grow the ordered porous titanium dioxide nanostructure .
The photocatalysis of ordered porous titanium dioxide in methylene blue solution can obtain 93.75% of degradation after UV-light treatment for 5 hours. In contrast, after UV-light treatment for 5hours, titanium dioxide thin film annealing at 500℃ on quartz substrate can only achieve 55.64% of degradation.
This experiment successfully prepared ordered porous titanium dioxide nanostructure with high specific surface area and enhanced photocatalytic efficiency ,using two-step anodizing anodic aluminum oxide membrane.
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