Preparation and Characterization of ZnO Hollow Micro-spheres with Excellent Property of Blue Emission

With the assistance of glucose and citrate, hollow micro-spheres of zinc citrate were prepared through low-temperature hydrothermal route, and then hollow micro-spheres of ZnO were obtained by calcinating the precursor at 500 n air. The composition, structures and morphologies of products were characterized by XRD, TG-DSC, SEM, TEM and IR. It was investigated that the precursor hollow micro-spheres with average diameter of 2 μm and thickness of 200 nm were prepared by the hydrothermal route. ZnO hollow micro-spheres prepared by calcinating the precursor with average diameter of 1 μm and thickness of 100 nm were composed of nanoparticles with diameter of 20–30 nm. The room-temperature photoluminescence property of the sample was studied. Under excitation wavelength of 325 nm, the as-prepared ZnO hollow micro-spheres possess excellent properties of blue emission, locating at 469 nm.