Abstract
Two nanocomposites of polyaniline (PANI) varying in their percentage composition of Ni(1−x)CoxFe2O4 nanoparticle (20%, 10% w/w of fine powders) were prepared by in-situ chemical oxidative polymerization method with and without ultrasonic treatment. The spinel ferrite nanoparticles of chemical composition Ni(1−x)CoxFe2O4 were prepared by auto combustion method. The structure and morphology of PANI and nanocomposites were characterized by X-ray diffraction (XRD) and High resolution transmission electron microscopy (HRTEM). The chemical structure of Ni(1−x)CoxFe2O4 nanoparticles and its composites were characterized by using Fourier transform infrared (FTIR), UV–visible absorption spectrometer and XRD techniques. Dielectric properties of nanocomposites at different temperature have been performed in the frequency range of 50Hz to 5MHz. Dielectric constant, dielectric loss and AC conductivity of PANI/Ni(1−x)CoxFe2O4 nanocomposites are significantly increasing with increase in ferrite content due to the polaron/bipolaron formation. The optical absorption experiments of PANI/Ni(1−x)CoxFe2O4 nanocomposite illustrate a direct transition with an energy band gap of Eg around 1.7.
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