Magnetic susceptibility and frequency dependence ac conductivity of PPY/PANI/V2O5 nanosheets

Abstract

The conducting copolymer (CCP) Polypyrrole (PPY)/ Polyaniline (PANI) and polycrystalline conducting copolymer nanocomposites (CCPNCs) PPY/PANI/V2O5 were synthesized by in situ chemical oxidative polymerization with nano-particles (NPs) V2O5 using FeCl3 as an oxidant and HCl as dopant by keeping different molar weight percent of V2O5 with pyrrole and aniline. The chemical structures of prepared PPY, PANI, PPY/PANI, V2O5 and CCPNCs are characterized by Fourier transform infrared (FT-IR) spectroscopy and X-ray diffraction (XRD) techniques. Scanning electron microscopy (SEM) were used to characterize the surface morphologies of the PPY, PANI, NPs and the CCPNCs shows some nanosheets having thickness about 28 nm. The grains are highly agglomerated and well interconnected with each other. XRD patterns of the CPNCs shows significant effect of change in weight % of additives V2O5 on polycrystalline structure and shows variation in crystallinity. FTIR reveals the broad absorption bands in the range 1100 – 1150 cm−1, which confirms the formation of polymers and absorption bands in the lower frequency regions (750 to 400 cm−1) confirm the existence of MO groups in the hybrids. Magnetic susceptibility increases as increase in magnetic field shows paramagnetic behaviour of CP, CCP and CCPNCs powder at room temperature studied by Gouy’s method. A gradual increment in ac conductivity of CP and CCP were observed with increase in frequency and with increase in temperature, revealing its semi-conducting behaviour. CCPNCs pellets also demonstrated a similar trend with increase in conductivity is the effect of different weight % of additive studied by computer control High Resolution Dielectric Analyser.