Dielectric Spectroscopy of Polypyrrole-CeO2 Nano Composites

Abstract: Conducting Polypyrrole-Cerium Oxide (Polypyrrole-CeO2) composites were synthesized by in situ deposition technique by placing different weight percentages of CeO2 powder (10, 20, 30, 40 and 50%) during the polymerisation of pyrrole. AC conductivity of Polypyrrole-CeO2 composites was studied in the frequency range from 102–107 Hz. It is found from these studies that, at low frequency AC conductivity remains constant and increases rapidly at higher frequency. This behavior is the characteristic of disordered materials. The dielectric behavior of these composites was also investigated in the frequency range 102–107 Hz. From these studies it is observed that the dielectric constant and dielectric tangent loss decrease exponentially with frequency. At higher frequency the composites exhibit a low value of dielectric loss.

Keywords: Polypyrrole, Composite, AC Conductivity, Oxide, Dielectric constant.