Study of structural and optical properties of ZnS:Cr nanoparticles synthesized by co-precipitation method

A Rahdar

doi:10.17485/ijst/2012/v5i1.28

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 (E g ) increases with the increase in molar concentration of doping agent is attributed to size quantization effect due to the small size of the particles.

Highlights

The theoretical and experimental researchesDuring the past two decades, the “small-particle” on Cr doped ZnS are still limited.research has become quite popular in various fields of Keeping in view the above discussion, In the present chemistry and physics
The main purpose of the present research materials that have hybrid molecular and bulk properties. is to study the effect of Cr doping on structural and optical. They have attracted much attention over the past few properties of ZnS:Cr nanoparticles synthesized by coyears because of their novel properties originating from precipitation method
All of the crystalline Bragg peaks in the X-ray diffraction (XRD) pattern ((002), (110) and (200) planes) are in a good agreement with the diffraction data of hexagonal structure with cell parameters a=3.600 Å and c=6.130 Å

Summary

Introduction

The theoretical and experimental researchesDuring the past two decades, the “small-particle” on Cr doped ZnS are still limited.research has become quite popular in various fields of Keeping in view the above discussion, In the present chemistry and physics. These size dependent optical properties have many Preparation of ZnS:Cr nanoparticles by co-precipitation potential applications in the areas of solar energy method conversion, light emitting devices, chemical/biological A high number of nuclei are still forming at this stage when the reaction is slow at the same time; some sized nanocrystals is related to the size decrease of particles and is attributed to the quantum confinement limit reaching of nanoparticles.

Results

Conclusion