| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 100 === This thesis concerns the deposition of Ag nonoparticles on ZnO nanorod arrays and their applications in photocatalysis and surface enhanced Raman scattering (SERS). Firstly, ZnO nanorod arrays were synthesized by the sol-gel formation of ZnO nanoparticle seed layers and the followed hydrothermal method. After heat treatment in hydrogen or air, Ag nanoparticles were deposited on ZnO nanorod arrays by photo-reduction method. The size of Ag nanoparticles as well as the surface morphology, structure, composition, and optical property of ZnO nanorod arrays before and after the deposition of Ag nanoparticles were characterized by SEM, XRD, EDS, and UV/VIS/NIR spectrophotometer. As compared to the samples with heat treatment in air or without heat treatment, the ZnO nanorod arrays after heat treatment in hydrogen allowed Ag nanoparticles to be deposited more uniformly, densely, and numerously. Also, they exhibited the higher efficiency for the visible light-driven photocatalytic degradation of R6G dyes (Rhodamine 6G) and the better SERS effect. For the photocatalytic degradation of R6G dyes, the effect of the amount of Ag nanoparticles, initial dye concentration, and temperature on the efficiency were also investigated. For the analytical application of SERS, the detection limit of R6G dyes could be lowered to below 10-9 M.
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