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Structural and electrical studies on ZnS nanoparticles prepared without using capping agent

HARIT KUMAR SHARMA1, P. K. SHUKLA2,* , S. L. AGRAWAL1,*

Affiliation

  1. SSI Laboratory, Department of Physics, APS University, Rewa, India
  2. I.T.S Engineering College, Greater Noida, India

Abstract

In this work, zinc sulfide (ZnS) nanoparticles have been synthesized by simple chemical precipitation method without using any capping agent. The synthesized nanoparticles were characterized using XRD, optical microscopy, UV-Vis, FTIR, and impedance spectroscopy. The X-ray diffraction shows that ZnS particles have cubic sphalerite structure with the crystallite size of 10-20 nm. SEM images of nanopowder samples reveal the presence of nanoflakes and agglomerated nanoparticles. Formation of ZnS has been confirmed through the appearance of 714 cm-1 absorption peak. The thermal stability of synthesized nanoparticles has been checked by annealing the material at different temperatures. Transformation of ZnS into ZnO subsequent to annealing has been evidenced from XRD and FTIR studies. UV-Vis spectra exhibited a red shift in the optical absorption on increase in annealing temperature. Variation in electrical conductivity obtained from impedance measurements at different temperatures has been suitably correlated to Davis- Mott model.

Keywords

Zinc sulfide nanoparticles; II-VI semiconductors; Chemical precipitation method; Optical band gap; Annealing.

Submitted at: Oct. 27, 2014
Accepted at: May 7, 2015

Citation

HARIT KUMAR SHARMA, P. K. SHUKLA, S. L. AGRAWAL, Structural and electrical studies on ZnS nanoparticles prepared without using capping agent, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 5-6, pp. 608-613 (2015)