| Summary: | 碩士 === 國立中興大學 === 材料科學與工程學系所 === 102 === Stable, nontoxic, and low cost TiO2 with high redox potential has been widely used in optoelectronics devices, solar cells, photocatalysts, and biomaterials. Particularly, anodized TiO2 nanotubes of easy synthesis and low cost can generate electron-hole pairs under UV-light irradiation guide the transfer of electrons. However, the rapid recombination of the electrons holes will reduce the photocatalytic activity. Therefore, surface modifications and TiO2 heterostructures have been intensively studied. In this study, ZnO nanorods were first grown on anodized TiO2 nanotubes by a hydrothermal method, and the TiO2/ZnO heterostructures were then sensitized and activated to form TiO2/Pd nanodendrite heterostructures by a non-uniform Zn+2 electric field. With increasing sensitization/activation time, Pd nanodendrites became particles of low surface energy. Because of the large surface area of the dendrite structure for reactions and the enlarged light absorption range, the photocatalytic activity was markedly enhanced. The photodegradation rates of dye pollutants in the presence of the TiO2/Pd nanodendrite heterostructures were much higher than those only in the presence of TiO2 nanotubes.
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