Synthesis, Electrical Conductivity, and Dielectric Behavior of Polyaniline/V_<b>2</b>O_<b>5</b>Composites

Abstract

Conducting polymer composites of polyaniline/vanadium pentaoxide PANI/V 2 O 5 (with different initial weight percentage of V 2 O 5 ) has been synthesized by in situ polymerization method. DC conductivity of compressed pellets has been analyzed in the temperature range 300–550 K and was found to increase with V 2 O 5 doping. This increase in conductivity is mainly due to band conduction. It has also been observed that the dielectric constant and dielectric loss increase with the level of doping of V 2 O 5 but remain independent of the frequency (50 KHz–1 MHz). X-ray diffraction pattern shows some order of crystallinity of composites due to interaction of polyaniline with V 2 O 5 . UV-visible spectroscopy shows an increase in the optical band gap with doping.