Abstract
A series of solid biopolymer electrolytes (SBEs) based carboxymethyl cellulose doped with different weight percentage of ammonium fluoride, NH4F were prepared by the solution cast technique. The ionic conductivity was investigated using electrical impedance spectroscopy in the frequency range of 5 0Hz – 1 MHz. The highest ionic conductivity of 2.68 × 10−7 Scm−1 (9 wt.% NH4F) was obtained at ambient temperature. The ionic mobility and diffusion coefficient of charge carriers were identified to influence the enhancement of ionic conductivity in SBE samples. The exponent s of SBE samples were determined using Joncher's Universal Power Law. The conduction mechanism of the most conductive SBE sample can be represented by quantum mechanical tunnelling model.
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