| Zinc oxide (ZnO) is a wide-band gap semiconductor that possesses excellent optical and electronic properties, and as a result it stimulates a broad range of researching interest. It shows great promising applications in ultraviolet Lasers, solar cells, sensors and so on. Low-dimensional ZnO materials, which have various shapes and special properties,and device can be acquired through ZnO self-organized growth.At present, the research on low-dimensional ZnO materials is concentrated in new shapes and well-aligned array, nearly about the controlled growth of materials'dimensions. In this thesis, ZnO microtube was prepared by hydrothermal method though self-organized growth. ZnO microtubes controllable growth was obtained on the glass substrate which was previously deposited of ZnO hollow spheres. Prepared methods and optical properties have been studied.1. The prepared methods of ZnO self-organized growth were studied by details. Concentration of precursor was 0.5 Mol/L, temperature and holding times were 120℃(2 hours) and 185℃(6 hours) respectively .Under this condition ,regular ZnO microtubes were prepared.2. The optical properties were studied by details. ZnO had an intensive UV emissing and a weak deep level emission.The effect of heat treating about UV emissing and deep level emission was different: UV emissing enhanced and deep level emission weakened when the annealing temperature was lower than 450℃and it reversed when the annealing temperature was above 450℃.3. The microtube ZnO econtrollable growth on the glass substrate, which was previously deposited, of ZnO hollow spheres was researched. The results showed that ZnO hollow spheres acted as crystal nucleus of ZnO microtubes. By this method regular ZnO microtubes were synthesised.The growth of microtubes can be controlled by change the size of ZnO hollow spheres.4. The condition of controlled growth was researched, and it was that conc-entration of precursor was 0.5 Mol/L, temperature and holding times were 185℃and 6 hours. |
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