Synthesis Route of ZnO Nanostructures in Basic Solution

Abstract

ZnO nanostructures were synthesized by simple route method. The starting material of ZnO was prepared from ZnSO4.7H2O. The synthesis of ZnO nanoparticle was conducted by NaOH addition in alcoholic solution. That precursor was refluxed for 2 hours at 60°C until ZnO powder formed. Then the solids obtained were dried following by annealing process at 400, 500, and 600 °C. The XRD analysis confirms the Wurtzite hexagonal crystal structure of the product with crystallite size in 19–25 nm range. The morphology of the nanostructure product has been studied under scanning electron microscopy (SEM) dan transmitance electron microscopy (TEM). Generally, the ZnO nanostructure seem regularly spherical morphology, while the aglomeration were spherical ZnO-capped nanoplate ZnO. Optical properties was studied using ultraviolet visible absorption spectroscopy resulted the ZnO band gap about 3.5 eV.