Control Synthesis Of Metal And Metal Oxides Nanocrystals And The Study Of It's Formation Mechanism

This dissertation reported the morphologies-controlled synthesis of some nanomaterials and its formation mechanism. The surfactant assistant hydrothermal method was developed to synthesize two kinds of Ag/C nanostructures. By adjusting the experiment parameters, 3-dimension ZnO nanostructures, oriented attached LaMn2O5+δ nanorods and Manganese Oxyhydroxide/Oxide Nanostructures weresynthesized. 1-dimension oxides nanomaterials were prepared through chemical vapor deposition on copper substrates.1. The surfactants are introduced into the hydrothermal technique, silver core with carbon shell sphere nanoparticles and Ag/C nanocables were synthesized by using silver nitrate and ascorbic acid as the reactants. CTAB was introduced as surfactant, and adjusting the concentration of CTAB controlled the micelle's shape. The shape of the micelle decided the morphology of products.2. By controlling the concentration of reactant, pH value, reaction temperature and time to adjust the precursor nucleation rate, 3-dimension ZnO nanostructure was successfully synthesized by using zinc acetate and sodium hydroxide as reactant. The 3D flowerlike nanostructures formation process was investigated using TEM analysis by checking the product obtained at different reaction time. The successful controlled growth of self-assembled 3D nanostructures can be used to study the effects of spatial orientation on their optical, electronic and piezoelectric properties.3. The LaMn2O5 nanorods were successfully synthesized through oriented attached growth by adjusting the reaction parameters, such as reaction temperature and pH value. TEM and HRTEM proved these nanorods are same orientation. Utilizing the redox reactions between MnO4- and Mn2+ and the adjustment of the pH, single-crystal γ-MnOOH nanorods and quadrangle-shaped Mn3O4 nanoparticles were synthesized through a simply hydrothermal process. Furthermore, single-crystalline MnO2 and Mn2O3 nanorods can be obtained after subsequent calcinations of the as-prepared γ-MnOOH nanorods.4. Based on the binary alloy phase diagrams, the copper foil substitute for...