Current–voltage characteristics and thermal studies of polypyrrole-octacyanotungstate composite

Abstract

ABSTRACT Composites of conducting polymers with transition metal complexes (TMCs) present a fascinating combination of properties for targeted applications. This paper reports the synthesis of PPy/Octacyanotungstate composite by oxidative chemical polymerisation method. XRD and FTIR analysis confirmed the synthesis of composite and have been found to exhibit enhanced thermal stability over that of pure polypyrrole (PPy). From I-V characteristics using different models of conduction, PPy follows SCLC (space charge limited conduction) at lower voltages and as voltage increases it starts to follow Ohmic behaviour. In composite, however, the behaviour is Ohmic at lower voltages and as voltage increases exponential rise of current takes place which is consistent with Richardson Schottky or Poole Frankel model.