Preparation And Properties Of ZnMgO And ZnO Nanomaterials On Glass Substrate

Zinc oxide (ZnO) is a wide bandgap semiconductor compound materials, at room temperature, band gap is 3.37eV, exciton binding energy is 60meV, chemically stable, rich in material type by doping with a good optical performance. Magnesium oxide (MgO) has a large energy gap width (about 7.78 eV), and Mg ionic radius (0.057nm) and Zn ionic radius is very close. The band gap of Mg doped ZnO nano-materials can be continuously adjustable between 3.37 ~ 7.78 eV, and can be obtained from the blue to ultraviolet spectrum covering areas of semiconductor lasers. Therefore, preparation and properties of Mg doped ZnO nanomaterial is an important subject .This paper reviews zinc oxide (ZnO) nano materials, preparation methods, doping status and MgZnO alloys. Based upon that, two types of ZnMgO/ZnO nanostruetures using chemical vapor deposition (CVD) on glass substrates have been fabricated suceessfully. The growth mechanisms of the ZnMgO/ZnO nanostructures were proposed, and the impact of growth parameters on the morphology is discussed, such as the carrier gas flow rate, growth temperature, the indoor pressure. The silicon substrate and glass substrate have a brief description on the materials, and their optical properties were investigated. The main results achieved in this dissertation are given as bellow:1,Preparation and Properties of ZnMgO/ZnO Micro-nano spheresZnMgO/ZnO micro-nano spheres and nanorods are synthesized on conductive glass substrate via chemical vapor deposition (CVD) process without any metal catalyst. ZnMgO micro-nano spheres are hollow and outer radial,ZnMgO nanorods grew along c axis direction of wurtzite ZnO,with diameters ranging from 100 to 300 nm and arrangement Neat. the ZnMgO nanorods have hexagonal morphology,Which isn't centrosymmetric due to the doping of Mg. The 349.5nm (Origin fitting) and 420.5nm are two typical emission peaks in photoluminescence spectrum. ZnO nanorods have Synthesis of large area and arrangement compact, ZnO micro-nano-ball was synthesized on the nanorods. The formation mechanism is analyzed. 2,Preparation and optical properties of ZnMgO comb-likeZnMgO comb-like and nanorods are synthesized on conductive glass substrate via changing the carrier gas (argon) flow rate and the growth temperature and chemical vapor deposition (CVD) process without any metal catalyst. Scanning electron microscopy (SEM, J EOL-6360LV), X-ray diffraction (XRD, MAC science M18X), energy dispersive spectroscopy (EDS), He -Cd laser were used in analyze the morphology, structure, photoluminescence. The growth process of ZnMgO comb-like is analysis. ZnMgO comb-like produce 226meV peak near band edge emission blue shift and increase in band gap.3,The comparison of preparation ZnMgO nano-materials on the glass substrate and silicon substrate.ZnMgO micro nanoparticles are synthesis via the same experimental method, and the glass substrate and silicon substrate are placed of parallel. Electron microscopy (SEM),energy dispersive spectroscopy (EDS),X-ray diffraction (XRD),Photoluminescence(PL) have been used to analyze the samples. The conductive glass substrates contribute to the rapid formation of nano materials, ZnMgO micro nanoparticles are hollow and have a good shape. The thickness and uniform are size of ZnMgO nanorods.On silicon substrate,the micro nanoparticles are internal and external radiation,the nanorods are irregular, but there is a good c-axis preferential growth. The reasons and mechanism of these differences are brief analyzed...