Ac Conductivity and Dielectric Studies of Polypyrrole Copper Zinc Iron Oxide Nanocomposites

Abstract

Polypyrrole and polypyrrole/copper zinc iron oxide (CuZnFe2O4) nanocomposites are synthesized by in-situ polymerisation in different weight percentages using oxidation method. Dielectric and conductivity behaviours of Polymer nanocomposites of various composition were investigated using impedance spectroscopy at different temperatures and frequencies (100 Hz-5 MHz). The dielectric properties of host polymer matrix have been improved by the addition of nanoparticles and are found to be highly temperature dependent. Both Dielectric constant and Dielectric loss decreased with increase in frequency for all composites, indicating a normal behaviour of dielectrics. Increase in dielectric constant and dielectric loss was observed with respect to temperature, which is attributed to increase in number of dipoles due to thermal energy. Dielectric relaxation is observed at low frequency range, relaxation time is calculated from the dielectric loss peaks. The highest conductivity was observed at 373K for all nanocomposites. The significant increase in dielectric constant makes them a potential candidate for dielectrics in capacitors used for decoupling, timing, filtering, and many other functions.