Ionic conductivity by correlated barrier hopping in NH4I doped chitosan solid electrolyte
Document Type
Article
Publication Date
1-1-2009
Abstract
Chitosan-NH4I and chitosan-NH4I-EC films have been prepared by solution cast technique. The sample containing 45 wt% ammonium iodide (NH4I) exhibited the highest room temperature conductivity of 3.7.10(-7) S cm(-1). The conductivity of the sample increased to 7.6 x 10(-6) S cm(-1) when 40wt% ethylene carbonate (EC) was added to the 55 wt% chitosan-45 wt% NH4I sample. The conductivity-temperature relationship is Arrhenian. From dielectric loss variation with frequency, the power law exponent was obtained. The temperature dependence of the power law exponent for chitosan-NH4I system follows the correlated barrier hopping (CBH) model while conduction mechanism of the plasticized system can be represented by the small polaron hopping (SPH) model. (C) 2009 Elsevier B.V. All rights reserved.
Keywords
Permittivity, Power law exponent, Correlated barrier hopping (cbh) model, Small polaron hopping (sph) model, Polymer electrolyte, Ac conductivity, Dielectric-properties, Transport-properties, Lithium, Salt, Behavior, Plasticizer, Membranes, Glasses
Divisions
PHYSICS
Publication Title
Physica B: Condensed Matter
Volume
404
Issue
8-11
Publisher
Elsevier
Additional Information
Department of Physics, Faculty of Science Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA