Controllable growth of ZnO nanoarrays in aqueous solution and their optical properties

摘要

ZnO sheet arrays were vertically aligned onto an aluminium flake after pyrolysis of Zn_5(OH)_8Cl_2H_2O sheets which were fabricated in aqueous zinc chloride and hexamethylenetetraamine solution. The ZnO sheets, with diameter of 0.5-1 mu m and thickness of 30-50 nm, incline to have satisfactory configuration of vertical alignment on the aluminium flake. Vertically aligned ZnO rod arrays with diameters of 50 nm were successfully grown on a silicon wafer coated with ZnO sol (Si_(coated)) in the same aqueous solution. Furthermore, from the photoluminescence (PL) and the energy dispersive x-ray (EDX) analysis, the dominant intrinsic defect of the ZnO sheet arrays was vacancies of zinc (V_(zn)). As-synthesized ZnO nanostructures have potential applications in fabricating next-generation nanodevices.