OPTICAL PROPERTIES OF CO2+-DOPED ZNS NANOPARTICLES SYNTHESIZED USING REVERSE MICELLE METHOD

Abstract

Zinc sulfide is a luminescence materials with important application that exist either as a bulk material or in the form of nano crystal. Doped ZnS nanoparticles form a new class of luminescence materials and provide a new physics to control the particles size. This paper concerns detailed structural, spectroscopic and crystal field studies of ZnS nanoparticles, both pure and doped with CO²⁺ ions that successfully synthesized at room temperature. Zn1-xCoxS (x =0.00,0.02,0.04,0.06,0.08 and 0.10) was prepared by reverse micelle method using sodium bis(2-ethylhexyl) sulfosuccinate (AOT) as surfactant. The effect of ion doping on the optical characterization, structure and morphology of ZnS:Co²⁺ were investigated using ultraviolet-visible (UV-vis) spectroscopy, photoluminesence (PL) spectroscopy, X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM)  and transmission electron microscopy (TEM). EDAX spectra confirmed the incorporation of ion dopants into ZnS crystal structure, and XRD results showed that ZnS:Co2+ nanoparticles crystallized in a zinc blende structure. The particle size of all of samples ranged from 2 nm to 3 nm. In the PL emision, two peaks were observed at 460 and 608nm that a new peak for Co2+ doped ZnS ever reported. The Co²⁺ doped ZnS nanoparticles using reverse micelle method showed that there is considerable change in the photoluminescence spectra of the ZnS nanoparticle doped Co²⁺.