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 UVvisible 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 10 2 -10 6 Hz using LCR meter. Dielectric permittivity 0 ðwÞ and dielectric loss factor 00 ðwÞ were investigated. It was observed that 0 ðwÞ and 00 ðwÞ decrease with increase in frequency at all temperatures. At a particular frequency it is observed that both 0 ðwÞ and 00 ðwÞ increase with increase in temperature. It was also observed that AC conductivity increased with increase in frequency and temperature.

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The polyaniline/graphite oxide (PANI/GO) nanocomposite was prepared by the in situ chemical polymerisation method. The synthesis involved the formation of dark green coloured polyaniline/graphite oxide composite. The crystalline structure and morphology of the composite were studied using UV-visible spectroscopy (UV), X-ray diffraction (XRD) and transmission electron microscopy (TEM).The characteristic peaks in XRD and UV-visible spectra confirmed the formation of the PANI/GO nanocomposite. DC conductivity measurements were performed using a two-probe method. Dielectric responses of the composites were investigated in the frequency range100 MHz to 3 GHz by the RF impedance analyser. The dielectric constant ϵ 0 (w) and dielectric loss ϵ 00 (w) were investigated. It was observed that the dielectric constant ϵ 0 (w) and dielectric loss ϵ 00 (w) decreased with an increase in frequencies (for different wt % of GO). The antibacterial activity of this composite was examined.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.