Quasi-one-dimensional Nano-zinc Oxide, Preparation And Optical Characteristics

In this Thesis, various quasi-one-dimensional zinc oxide nanostructures were synthesized by hydrothermal method and thermal evaporation method. The effects of the various factors on the performance were discussed, the growth mechanisms were analyzed, and the sample's PL performances were studied emphatically. We characterized the samples with scanning electron microscope (SEM), X-ray powder diffraction (XRD), photoluminescence (PL) and total reflection X-ray fluorescence analysis (TRXF). The main research content and results were as follows:(1) ZnO nanorods were synthesized by a hydrothermal method in the presence of cetyltrimethylammonium bromide (CATB). The PL performances in room temperature, varying temperature and before/after anneal were characterized, meanwhile the spectrums and corresponding emission mechanisms were analyzed. The emission peak around 377nm was a free exciton emission process and the ratio between NBE and DL was 7, which indicated that the crystalline quality of the samples was better.(2) Co doped ZnO nanowires were synthesized by hydrothermal method. The results showed that the content of Co was between 2.8% and 4.3%. The PL result suggested that the sample had UV emission peak around 385nm, blue and green emission peak around 462nm and 495nm, and purple emission peak at 409nm and 433nm.(3) Flower-like ZnO microstructure was successfully synthesized on various substrates, such as Si, glass and glass coated with ZnO films, with zinc nitrate and hexamethylenetetramine without any surfactant. The mechanism of the flower-like structure was discussed with graphs.(4) Quasi-One dimensional ZnO nanostructures, such as ZnO nanowires and ZnO nanoarray, had been synthesized by thermal evaporation zinc power on various different substrates.