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Study of Fabrication ,characterization and Optical Properties of Zinc Oxide Nanostructure

Author: ZhangJianWei
Tutor: ChenSan
School: Huaibei Normal
Course: Materials Physics and Chemistry
Keywords: Zinc oxide Nano disc Quadruped -like Indium oxide Optical Properties
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 198
Quote: 0
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Abstract


Wurtzite structure of zinc oxide (ZnO) is a wide band gap semiconductor material at room temperature, the width of the band gap 3.37eV exciton binding energy of 60 meV, the ideal material for the preparation of UV electrical items. The nanoscale ZnO due to the small size effect and the quantum confinement effect was significantly better than in the physical properties of the material, is expected for the UV laser to build micro / nanoscale ultraviolet light-emitting diodes, high sensitivity biological / chemical sensor or the like. Nano ZnO practical basis for preparation of the material. Although it has been able to be prepared by a variety of methods by different morphology of the ZnO nanostructures, but the growth factors of the ZnO nanostructures also not completely effective in controlling, morphology and physical properties of the obtained nano-structure there is a greater chance, particularly understanding of the growth mechanism is still in the lower level. So, for some long period of time in the future, Preparation of ZnO nanostructures ZnO research is still an important content. In this paper, the T-shaped oxide zinc nanostructure-coated zinc oxide, indium oxide, as well as some novel morphology oxidation of ZnO nature, preparation method, on the basis of the testing means, the use of fumed prepared zinc oxide nano Singles zinc, using a scanning electron microscope (SEM), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), and photoluminescence (PL) spectrum characterization means the testing and analysis of samples. This paper is divided into three main parts: 1, This paper presents a simple way - air atmosphere under the conditions of a ZnO nano disc, direct evaporation of Zn powder in the crucible, by controlling the the Zn source of quality and evaporation temperature in silicon (100 ) substrate to obtain a diameter of the order of microns and thickness of a few hundred nanometers ZnO Singles. XRD spectra show that the sample as a pure phase wurtzite structure of ZnO photo morphology of the samples, to prove its size and zinc evaporation temperature is closely related to scanning electron microscopy (SEM). Room temperature photoluminescence spectrum 510nm stronger defect emission peak and 380nm weaker exciton emission peak. EDS spectra showed that the sample only containing oxygen and zinc, atom content ratio of 46.3:53.7, there is more oxygen vacancies, further confirmed by the results of the fluorescence spectra. 2, four-legged like zinc oxide (T-ZnO) is a useful application potential material, we use a simple vapor transport method, preparation of the foot-shaped and needle-like T-ZnO Whiskers and explore the growth mechanism. The analysis showed that the T-ZnO growth process is quite complicated, and at the same time there are VLS and VS growth mechanism. Morphology generates substrate temperature, the position of the substrate, and a saturated vapor pressure has a significant relationship. The gaseous zinc atom simultaneously present in the zinc vapor and condensation of the droplets of the growth of the zinc two different phases in the whiskers have a different role in the growth process. T-ZnO do the luminous performance testing, and did a brief analysis of its light-emitting mechanism. 3, prepared by the zinc oxide, indium oxide coated nanostructured, has an important role for the formation of the laminar structure of oxygen zinc found that the presence of indium. The same time, we have studied the photoluminescence properties of the prepared samples, found that the composite structure has rich luminous. However, it is proposed that this structure is still relatively superficial, but also need more experiments and theoretical analysis.

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