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Study of Structural and Optical Properties of ZnS:Cr Nanoparticles Synthesized by Co-precipitation Method


Affiliations
1 Department of Physics, Faculty of Science, University of Zabol, Zabol, Iran, Islamic Republic of
2 Physics Department, Faculty of Science, University of Birjand, Birjand, Iran, Islamic Republic of
 

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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  • Study of Structural and Optical Properties of ZnS:Cr Nanoparticles Synthesized by Co-precipitation Method

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Authors

A. Rahdar
Department of Physics, Faculty of Science, University of Zabol, Zabol, Iran, Islamic Republic of
H. Asnaasahri Eivari
Physics Department, Faculty of Science, University of Birjand, Birjand, Iran, Islamic Republic of
R. Sarhaddi
Physics Department, Faculty of Science, University of Birjand, Birjand, Iran, Islamic Republic of

Abstract


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

References





DOI: https://doi.org/10.17485/ijst%2F2012%2Fv5i1%2F30945