STRUCTURAL AND OPTICAL PROPERTIES OF ZnS NANOPARTICLES SYNTHESIZED BY SOLID STATE REACTION METHOD

The ZnS semiconducting nano particles were synthesized by solid state reaction method using Zinc acetate dehydrate and sodium sulfide as precursors at room temperature. The as-prepared ZnS nanoparticles have average particle size of 11 nm. Strain and the dislocation density were estimated by Stokes-Wilson formula. The structural features, chemical composition and optical properties of the nanoparticles were investigated by XRay Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infra Red Spectroscopy (FTIR), Ultra Violet spectroscopy (UV) and Photoluminescence (PL) studies. The optical properties of the ZnS nanoparticles are also discussed

Oxalic acid assisted synthesis of ZnS nanoparticles and their optical properties

ZnS nanoparticles and Oxalic acid (OA) assisted Zinc sulfide nanoparticles were synthesized by an easy and low-cost aqueous method using double distilled water as a solvent. A phase change has been observed while increasing the concentration of OA. Morphological studies by Transmission Electron Microscopy (TEM), Optical studies from Ultra Violet Spectroscopy (UV) and Photoluminescence (PL) and structural studies from X-ray diffraction (XRD) have been done to characterize the samples. UV absorption spectrum confirmed the blue shift and formation of nanostructures. From the PL spectrum, it is observed that both ZnS nanoparticles and OA assisted ZnS nanoparticles excited about 370 nm exhibit a blue-green emission between 420 and 470 nm. It may be recognized to the recombination of the imperfection of ZnS nanoparticles. The spherical morphology of ZnS nanoparticles and OA assisted ZnS nanoparticles has been shown in TEM micrographs and the size of the particles was measured as 8–20 nm and it is in good agreement with XRD studies