EFFECTS OF TEMPERATURE AND POLYVINYL ALCOHOL CONCENTRATIONS IN THE SYNTHESIS OF ZINC OXIDE NANOPARTICLES

[摘要] In this research the effects of annealing temperature and polyvinyl Alcohol (PVA) concentrations on the structural and optical properties of zinc oxide nanoparticles were investigated using a simple and cost effective, sol-gel method. The materials were characterized using X-Ray Diffraction (XRD), Fourier Transform Infrared (FT-IR), UV-Vis spectroscopy, Scanning Electron Microscopy (SEM) and Fluorescence Spectroscopy. From XRD result the synthesized ZnO has pure phase hexagonal wurtzit structure. Crystalline size, diffraction intensity and lattice parameters are increase with increase in calcinations temperature. Similarly, it has been also observed that there was an increment in the sizes, diffraction intensity and lattice parameters as the PVA concentrations increased. The morphology of ZnO NPs was characterized by SEM at different annealing temperatures. The FT-IR peaks appeared in the region of 400-600 cm−1 indicated the successful synthesizes of ZnO. The optical absorption of ZnO NPs measured at different annealing temperatures and PVA concentrations showed red shift as the temperature and concentrations were increased. Band-gaps energy decrease as the temperature and concentration decreases are due to the changes in the quantum confinement of NPs. The peak emission of the samples is independent of the temperature but its emission intensity depends on the temperature i.e it increased as the temperatures of the samples increased.

[学科分类] 生物技术

[关键词] ZnO NPs;sol-gel method;Crytal size;Temperatures effects and different PVA;concentrations