Ionic Conduction Mechanism of Solid Biodegradable Polymer Electrolytes Based Carboxymethyl Cellulose Doped Ammonium Thiocyanate

Abstract

A conducting solid biodegradable polymer electrolytes based carboxymethyl cellulose (CMC) doped ammonium thiocyanate (NH 4 SCN) system with concentration in the range 0 – 25 wt.% of NH 4 SCN have been prepared via solution casting method. The impedance study of CMC-NH 4 SCN system was measured via Electrical Impedance Spectroscopy (EIS) in the temperature range 303 K – 353 K. The highest ionic conductivity at room temperature (303 K) is 6.48 x 10 -5 Scm -1 for sample containing 25 wt.% NH 4 SCN. The temperature dependence of CMC-NH 4 SCN system was found to obey the Arrhenius behaviour where the ionic conductivity increases with increase of temperature. Dielectric data were analyzed using complex permittivity, Ɛ i for sample with the highest ionic conductivity at various temperatures and found was non Debye behavior. The conduction mechanism of the charge carrier of CMC-NH 4 SCN system can be presented by quantum mechanical tunneling (QMT) model.