Preparation And Properties Of Metal Oxide Semiconductor Nano-materials

Recently, quasi-one dimensional nanoscale materials, such as nanotubes, nanowires and nanobelts, have received considerable attention due to not only their bulk counterparts, but also their potential applications in the fields of electronic, magnetic recording, optoelectronic and so on, therefore, it become the frontier and focus of nano-materials.ZnO is an important wide band gap (3.37eV) semiconductor material with a binding energy of 60meV. In this paper, quasi-one dimensional nanoscales ZnO have been prepared and their physics properties and growth mechanism have also been studied.Single-crystalline wurtzite ZnO nanobelts with thickness of 30-50nm and lengths of over 1μm have been successfully synthesized by a simple hydrothermal treatment of the Zn(CH3COO)2·2H2O and PVA at 600℃for 1h. The nanobelts are liked grass and the top of nanobelts are peaked. ZnO nanobelts are wurtzite. The PVA have important effects on the morphologies of ZnO nanosructures. The mechanism of an ion complex transformation and polymer grids localization model for growing ZnO nanobelts has been proposed. The effects of growth conditions, inicluding the solution concentration, substrate, temperature have also been studied in detail. The HRTEM images reveal that the ZnO nanobelts have a single-crystalline structure.The mechanics and optical properties of our sample are consistent with the excellent results reported in the literatures. Studies of AFM of the samples revealed that ZnO nanobelts have superior hardness and elasticity. The photoluminescence research on ZnO nanobelts revealed that a broad green emission at 540nm. It might be related to the oxygen vacancies and zinc interstitial defects in the ZnO nanobelts. The potential applications in the fields of MEMS and optoelectronics of ZnO nanobelts are also introduced.