Synthesis And Characterization Of Nanomaterials Of ZnO-MgO System

Controllable growth of MgO nanomaterials were firstly achieved by two-zone tube furnace, on the basis of which we then successfully synthesized cubic cross-like ZnxMg1-xO nanomaterials containing high Mg contents for the first time. In addition, the growth mechanism and optical properties of hexagonal screw-like ZnO nanomaterials were also studied. In details:1. Synthesis and characterization of MgO nanomaterialsMgO nanomaterials could be synthesized when the temperature of source zone was between580℃-900℃, as well as the growth zone was between850℃-1100℃. In particular, one-dimensional MgO nanostructures could be synthesized only when the temperature of source zone was below800℃, and the growth zone was beyond900℃at the same time. In addition, MgO nanostructures with different morphologies could be synthesized under different conditions, which could be explained by the corresponding super saturation vapor pressures.2. Synthesizing and characterization of cubic ZnxMg1-xO nanomaterials(1) Cubic ZnxMg1-xO nanomaterials could be synthesized when the temperature of source zone was between620℃-800℃, and the growth zone was set as1100℃, What’s more, the relationship between morphologies of ZnxMg1-xO nanomaterials and temperature of source zone was found.(2) On basis of the first part, we then studied a cross-like cubic ZnxMg1-xO nanostructure when the temperatures of source and growth zones were760℃and1100℃respectively. The Zn-Mg atomic ratio of the individual nanostructure is about23:77with x=0.23. The synthesis actually included two procedures:(1) forming the wurtzite ZnxMg1-xO seed layer and (2) growth of cross-like cubic ZnxMg1-xO nanostructures. The calculations revealed the nature of electronic and crystal structures of the cubic ZnxMg1-xO material.3. Synthesizing and characterization of hexagonal scew-like ZnO nanomaterials(1) Both the Mg powder in source and the pressures of the chamber had important influences on the morphology of ZnO nanomaterials.(2) The growth mechanism of the hexagonal screw-like ZnO nanomaterials was then studied. That’s the covering effect of ZnO and MgO on the source as well as the maintaining of parameters after the main growth procedure. Secondly, we studied optical properties of the hexagonal screw-like ZnO nanomaterials by PL and CL Interestingly, there was an uncommon optical phenomenon of the individual hexagonal srew-like ZnO nanorod, which we ascribed to the synthesis procedures and the detailed morphology. The real reason still needs to be studied further.