The Fabrication And Arrangement Of ZnO Nanostructrue Materials

Zinc oxide is recognized as one of the most important semiconductor materials due to its direct wide band gap (3.37 eV), large exciton binding energy (59 meV), and its application in optoelectronics, catalyst, sensors, and actuator. Extensive interest has been stimulated to fabricate ZnO nanostructure materials.In this study, chelator-assisted hydrothermal method and thermal oxidation method were designed to fabricate ZnO nanorod arrays, nanopreller arrays, nanobelt arrays and nanopricks, nanospheres etc. Growth mechanism of ZnO nanostructures was discussed. There are four sections of our work as follows:(1) Chelator-assisted hydrothermal method for growing ZnO arrays Large-scale highly oriented ZnO nanorod arrays were directly grown on zinc foil through a simple hydrothermal reaction of Zn foil with 0.6 mol/L aqueous ammonia and 1.0 mol/L sodium hydroxide solutions. The morphologies and crystalline phase of the products were characterized by SEM, XRD, HRTEM etc. It was found that the structure of ZnO nanorods on the zinc foil was single crystalline and grown in the (002) direction with the zincite structure. The ZnO nanorod arrays exhibited a strong UV emission with peak at 396nm and a very weak green emission with peak at 488 nm.ZnO nanoprepellers were observed at the interface of vapor phase and solution when zinc foil reacted with solution ammonia (4~8 mol/L). ZnO nanorods and nanopricks were grown on the position that is above or below the interface.(2) Chelator-assisted hydrothermal method for growing ZnO nanopricksZnO nanopricks were formed while 0.3 mol/L diaminoethane, 3 mol/L butylamine and 0.25 mol/L EDTA were used as chalators to react with zinc foil at 100℃ for 12 h. The ZnO nanopricks which synthesized in diaminoethane solution also exhibited a strong UV emission with peak at 397 nm and two weak green emissions with peaks at 488 nm, 562nm.(3) Hydrolysis method for growing ZnO nanospheresZnO nanospheres were synthesized via hydrothermal thermolysis of tarteric acid-derived complex precursor at 140℃ for 12 h, SEM, XRD and HRTEM were used to characterize the product, the results indicate that the nanospheres were wurtzite ZnO...