New Method of Preparation ZnS Nano size at low pH

Abstract

Nano particles of zinc sulfide (ZnS) have been prepared by simple reaction between zinc chloride (ZnCl2) and sodium sulfide (Na2S) in aqueous solution at pH=3 as source materials.The characterization of the product was done by UV-VIS absorption, photoluminescence (PL) spectra, x-ray diffraction (XRD) and atomic force microscopy (AFM). The sizes of the sample as prepared were calculated by Debye-Scherrer formula according to XRD spectra. A UV-VIS optical spectroscopy study was carried out to determine the band gap of the nanoparticle ZnS to be about 4.27 eV. The room temperature photoluminescence spectra of the powder showed two peaks centered on 367 nm and 491 nm.The I-V characteristics are observed in dark and under illumination showing photosensitive nature of the ZnS powder.