SYNTHESIS AND CHARACTERIZATION OF PVA - ENCAPSULATED ZNS NANOPARTICLES

A system atic study is presented on the synthesis of PVA capped ZnS nanoparticles by using precursor solution of ZnCl2 and Na2S by a simple chemical precipitation method and characterized by X - ray diffraction (XRD), Transmission electron microscopy (TEM), UV - visibl e absorption spectroscopy and impedance spectroscopy. The XRD patterns confirm formation of wurtzite hexagonal phase of ZnS with size ranging 2 to 6 nm. TEM studies have shown decrease in particle size with improve morphology on capping of PVA in ZnS latt ice and Optical absorption spectra of synthesized material reveal blue shift in the optical band gap confirm quantum confinement effect of ZnS powder. Enhancement of conductivity in PVA - capped ZnS nanoparticles have been obtained from impedance measuremen ts at different temperatures and suitably correlated to Davis - Mott model .