Preparation And Characterization Of Nanostructure Of MgZnO

In this thesis, we synthesized nanostructure of MgZnO by powder metallurgy and thermal oxidation, and characterized it by XRD, FESEM and PL. We research it to find out what would happen in the MgZnO as the weight%of Mg or temperature changes.(1) We prepared nanostructure of MgZnO with vapor-solid growth mechanism by powder metallurgy (cold press and sintering) and thermal oxidation.(2) MgZnO were prepared with ZnMg alloy (weight percentage ratio Mg:Zn=4:1).With increasing annealing temperature,MgZnO(Mg:Zn=4:1) had the surface morphology like few nanowires, lots of methane-like nanorods and some micro spheres, lots of methane-like nanorods and some starfish-like sub micro rods. When annealing temperature is raised, diameter of microstructure of MgZnO increased. PL spectrum shows the relative intensity of peak at-390nm increased and the peak at-520 nm were observed.(3) MgZnO were prepared with ZnMg alloy(Mg:Zn=1:1).The morphology of samples prepared at 450℃shows few needle-like nanowire(D<50nm). Lots of urchin-like lolley needle rods exist at 500℃.Lots of methane-like micro rods exist at 600℃,and the surface of micro rods(D=-1.5μm) is covered with nanowires (D=-100nm).When lots of nanowires exist, PL spectrum shows a peak at-390nm obviously, and a weak peak at-520nm or no this peak.(4) MgZnO were prepared with ZnMg alloy (Mg:Zn=1:7). With increasing annealing temperature, the surface morphology changes as nanowires, nonobelts, sub-micro belts, micro rod. The XRD pattern of sample synthesized at 700℃may show that all Mg is exist in the samples as MgO. When annealing temperature is raised, PL spectrum shows the relative intensity of peak at-390nm and-520nm increased. The PL spectrum for 700℃is almost like the PL spectrum of ZnO as reported.