| Summary: | 碩士 === 國立中興大學 === 材料科學與工程學系所 === 98 === Titanium dioxide (TiO2) with many excellent properties is promising for the applications to optoelectronic devices, solar cells, photocatalytic, biomaterials, etc. The growth of TiO2 nanotube arrays by anodization processes has many advantages because of a low manufacture temperature, simple prossces, and low cost. However, the recombination of photoexcited electron-hole pairs in the TiO2 nanotubes will reduce the photocatayltic efficiency. Therefore, surface modification or hetrostructure on the TiO2 nanotubes has been extensively studied. In this study, TiO2 nanotube arrays were fabricated by anodization first. Sn-Pd nanoparticles were then deposited on the TiO2 nanotube arrays by a sensitization-activation method. It was found that the diameter and length of TiO2 nanotubes were depended on the anodic voltage and anodization time, respectively. Anatase TiO2 nanotubes were obtained by heat treatment at 450℃. The deposition of the Sn-Pd nanoparticles was dominated by the concentration of hydrochloric acid in the solution and also the sensitization-activation time. The growth Sn-Pd nanoparticles was found on anatase TiO2 nanotubes at specific sites and a orientation. However, before heat treatment, the TiO2 nanotubes deposited with Sn-Pd nanoparticles were amorphous and then crystallized into a rutile phase at 450℃. In photocatalytic properties, anatase phase TiO2 nanotubes with Sn-Pd nanoparticles have a better degradation rate for methylene blue (MB) and methyl orange (MO).
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