Structural and electrical conductivity studies on nanocrystalline undoped and silver doped zinc sulphide |
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| Authors: | S Chellammal S Sankar R Murugaraj S Selvakumar E Viswanathan K Sivaji |
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| Affiliation: | (1) Department of Physics, College of Engineering, Anna University, Guindy, Chennai, 600025, Tamil Nadu, India;(2) Department of Physics, Madras Institute of Technology Campus, Anna University, Chennai, 600044, Tamil Nadu, India;(3) Department of Nuclear Physics, University of Madras, Guindy Campus, Chennai, 600025, Tamil Nadu, India; |
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| Abstract: | Zinc sulphide (ZnS) and silver doped zinc sulphide nanocrystallites (ZnS:Ag) of average size 4 and 8 nm, respectively, have
been synthesized by chemical precipitation technique. The structural and morphological studies using X-ray and high resolution
transmission electron microscopy (HRTEM) measurements have confirmed hexagonal structure for the samples. Using the impedance
spectroscopy method, the effect of grain interior and electrode–sample interface effect on their conductivity have been studied
at various temperatures. In high temperature region, the electrode–sample interface effect is found to be larger than that
of the grain interior region. Further, the results of the activation energies of the charge carriers in both the regions are
determined and analyzed. The conduction mechanism of silver doped zinc sulphide nanocrystallites has been studied at various
temperatures and the results are reported. |
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