Indian Journal of Science and Technology
Year: 2012, Volume: 5, Issue: 1, Pages: 1-4
A. Rahdar1 , H. Asnaasahri Eivari1 and R. Sarhaddi2 *
In this paper, we report structural and optical properties of nanocrystalline chromium (Cr) doped ZnS particle, which have been synthesized by co-precipitation method. The structural properties of ZnS:Cr nanoparticles have been characterized by X-ray diffraction (XRD) analysis. The XRD patterns show hexagonal structure in nanoparticles without any additional phase. The mean crystallite size calculated from the XRD patterns has been found in the range 2.45- 1.50 nm with the increase in molar concentration of doping agent. Absorption spectra have been obtained using UV-Vis spectrophotometer to find the optical direct band gap. The obtained values have been founded to being range 3.82- 4.42 eV. It was also found that optical band gap (Eg) increases with the increase in molar concentration of doping agent is attributed to size quantization effect due to the small size of the particles.
Keywords: ZnS:Cr, Chemical co-precipitation, 2-Mercaptoethanol, Optical band gap
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