Annealing effect on structural, microstructural and electrical properties of ZnS nanoparticles synthesized in aqueous medium
Written by sctunisie no commentsNanocrystalline zinc sulfide (ZnS) was synthesized by simple chemical precipitation in aqueous medium at 80°C using zinc nitrate and thioacetamide (TAA) as reactants. The prepared products were annealed in air at different temperatures in the range of 500–650°C. The as-prepared and annealed samples were characterized by different techniques. The structure and morphology of the products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infra-red (FT-IR) and Energy-Dispersive X-ray (EDX) spectroscopies. From the XRD and FT-IR analysis, the crystal structure is found to convert from cubic ZnS phase to the hexagonal ZnO phase with the increasing annealing temperatures. The electrical properties of ZnO nanopowder were investigated using impedance spectroscopy. The electrical conductivity increases with increasing temperature with a typical Arrhenius-type behaviour. The Arrhenius plot presented two linear portions indicating tow dominant mechanisms affecting the electrical conductivity of ZnO.
A. Yacoubi, T. Ben Chaabane
Zinc sulphide, Zinc oxide, Annealing effect, Nanoparticles, Nanotechnology, Impedance spectroscopy, Electrical conductivity, Activation energy
Pages 31-37
