Temperature characterization of dielectric permittivity and AC conductivity of nano copper oxide-doped polyaniline composite

Abstract

The polyaniline/copper oxide (PANI/CuO) nanocomposite was prepared by mixing solutions of polyaniline and copper oxide nanoparticles in dimethyl sulfoxide (DMSO). The synthesized polymer nanocomposites were characterized by X-ray powder diffraction (XRD), scanning electron microscope (SEM) and UV–visible spectroscopy. The characteristic peaks in XRD and UV–visible spectra confirmed the presence of CuO in the polymer structure. SEM images indicated morphological changes in the composite matrix as compared to the pristine PANI. The DC conductivity measurements were performed using two-probe method for various temperatures. AC conductivity and dielectric response of the composites were investigated in the frequency range of [Formula: see text]–[Formula: see text][Formula: see text]Hz using LCR meter. Dielectric permittivity [Formula: see text] and dielectric loss factor [Formula: see text] were investigated. It was observed that [Formula: see text] and [Formula: see text] decrease with increase in frequency at all temperatures. At a particular frequency it is observed that both [Formula: see text] and [Formula: see text] increase with increase in temperature. It was also observed that AC conductivity increased with increase in frequency and temperature.