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International Journal of Polymer Science
Volume 2010, Article ID 241430, 5 pages
http://dx.doi.org/10.1155/2010/241430
Research Article

Study of the Electrophysical Properties of Composite Varistors Based on Zinc Oxide and Polymer (Polyaniline)

1Department of Solid State & Electronics, Faculty of Physics, University of Tabriz, Tabriz, Iran
2Institute of Physics, Azerbaijan National Academy of Sciences, Baku, Azerbaijan

Received 22 November 2009; Revised 14 March 2010; Accepted 11 May 2010

Academic Editor: Robert Shanks

Copyright © 2010 Sajedeh Mohammadi Aref et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this experimental work, current-voltage characteristics of composite varisrors prepared on the base of zinc oxide with different weight percentages of polyaniline and temperature dependence of the samples characteristics have been studied. The activation energy of donor levels as well as the existence of hysteresis loop has been investigated. The comparison of experimental results shows that by increasing the polymer percentage in the varistor structure as long as the nonlinear behavior is conserved, the threshold voltage increases. This comparison also indicates that increasing the polymer content in the varistor structure causes the temperature dependence of threshold voltage to decrease. It is also concluded that, by the increase of polymer content in the varistor structure, the activation energy of donor levels and the hysteresis value are increased.