Annealing temperature dependent on the synthesis and characterization of ZrO2; ZnO coated ZrO2 core-shell microspheres
N. Selvi, S. Sankar And K. Dinakaran
In the present study, ZrO2/ZnO core–shell microspheres were prepared via two steps. First, ZrO2 nanoparticles were synthesized by co-precipitation method. Second, the surface of ZrO2 was coated with ZnO by hydrolysis method. Subsequently, in order to reduce the amount of interaction and the agglomeration of ZrO2/ZnO microspheres, the zinc oxide shell particles are modified by Poly Ethylene Glycol as the coupling agent. Structural characterization of tetragonal ZrO2 and amorphous wurtzite structured ZnO on the surface of ZrO2 formation is confirmed by XRD analysis. Scanning Electron Microscope (SEM) and Transmission Electron Microscope (HRTEM) studies were used to determine the morphology and size of the microparticles. The presence of Zr and Zn functional groups are further confirmed by FT-IR studies. UV-VIS measurement shows absorption peaks in the UV region for both ZrO2 and ZrO2/ZnO and there is a significant increase in the intensity of photoluminescence peak for ZnO-coated ZrO2 than bare ZrO2 infers the recombination of the photo generated charge.
Keywords: ZrO2/ZnO core shell microsphere, Coprecipitation, SEM, HRTEM, UV-Vis.