| Summary: | 碩士 === 國立成功大學 === 材料科學及工程學系碩博士班 === 101 === In this study, the rutile TiO2 nanorods (TNRs) were grown on a TiO2 seed layer coated Si substrate by a hydrothermal technique. We have studied varied parameters, including precursor concentration, temperature, reaction time and pH in the hydrothermal reaction to see how they affect the TiO2 nanorods growth. We found the best condition for hydrothermal growth is 0.04M TBOT at 160 °C for 3 hrs on TiO2 seed layer which annealed at 700 °C for 1 hr.
Due to a wide band gap (Eg ~ 3.3 eV) of TiO2, its application is limited in the UV range. In order to further extend its absorption of visible light, Cr-doped TiO2 nanorods were synthesized by a hydrothermal treatment. XRD, SEM, TEM, Raman, and UV-Vis were carried out to determine how different concentrations of Cr dopant affected crystallinity, structure, morphology, and optical properties of TiO2 nanorods. The photocatalytic activity of Cr-TiO2 was investigated using methylene blue as a targeted pollutant under both UV and visible light irradiation. We found that doping of Cr with suitable ratio (7% mol) can significantly improve the photocatalytic activity of TiO2 nanorod under a visible light.
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