Shape-controlled ZnO nanoparticles prepared by chemical precipitation method

• Main Authors: Kuo-Lin Hung, 洪國麟
• Other Authors: 陳志恆
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/e58w49

碩士 === 國立臺北科技大學 === 資源工程研究所 === 100 === In recent years, the nano-zinc oxide with different morphology, such as nano-fiber, nano-plate and nano-tube, has been synthesized due to the development of nanomaterials technology. When one of the dimensions of zinc oxide scales down to nano range, the surface properties and crystal structure of zinc oxides may change with different morphology. The UV-vis absorption property of zinc oxide may markedly enhanced. In addition, the presence of oxygen defects will also affect the photoluminescence characteristics of zinc oxide. Nano-zinc oxide are usually synthesized by direct precipitation, hydrothermal, chemical solution deposition method and sol-gel approaches. In this study, we investigated the shape-controlled ZnO nanoparticles prepared by chemical precipitation method. It was demonstrated that various shapes of ZnO, including nano-rod, nano-plate and needle, were affect by urea concentration, reaction time and the types of polyol template, such as ethylene glycol, diethylene glycol and triethylene glycol. The samples were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Ultraviolet-Visible (UV-Vis) and photoluminescence (PL), by which the effect of various polyol template on the morphology of zinc oxide was discussed. As the amounts of polyol template (EG and DEG) increased and the urea concentration decreased, the morphology of zinc oxide were mainly rod-like. On the other hand, as the amounts of polyol template decreased and the urea concentration increased, the morphology of zinc oxide were mainly in sheet. The morphology of zinc oxide synthesized with polyols template (TEG) was mainly irregular sheet. Zinc oxide with different morphologies showed different UV-visible absorption and fluorescence emission.