Synthesis Of ZnMgO Nanomaterials By Thermal Evaporation And Properties Characterization

Low-dimensional nanostructures are an important research field in current Nano S&T. Nanostructures ZnO materials have received broad attention due to their distinguished performance in electronics, optics and photonics, and the band-gap can be modulated by doping with Mg for further application.In this paper, various methods synthesized ID pure and doped ZnO nanostructures have been summarized. Then we Then we have successfully fabricated two types of ZnMgO nanostructure by using thermal evaporation without catalyst. The growth mechanism of the nanostructures have been proposed. And the optical properties of the nanostructures have been investigated.The main results achieved in this dissertation are given as bellow:1 .Two types of ternary ZnMgO nanowires was synthesized with different morphology, the composition are Zn_0.84Mg_0.16O and Zn_0.12Mg_0.88O with hexagonal and cubic phase, respectively.the diameters of the nanowires are 30-80nm, and both have good orientation.2. After annealing at 850℃ under Ar, the PL spectra of Zn_0.84Mg_0.16O nanowires shows a blueshift which means the band-gap modulation effect.3. By using ZnO nanonuclei, we have fabricated the quasi-aligned ZnMgO nanorods with abrupt tips. The nanorods are about 200 nm in diameter and the tips are 50 nm. The Mg content is 5%, and the structure of the product is still hexagonal phase with high c-orientation. The PL spectra also shows a band-gap blue-shift.4.The growth mechanism of the nanorod was discussed, by changing the temperature of the growth process, we can control the tip morphology.5. The field-emission properties of the nanorods array was tested, and the factors that affect the performance were discussed.