The dielectric and impedance spectroscopy of poly vinyl alcohol doped with carbon (PVA-C)

Abstract

The poly vinyl alcohol (PVA) thin-film composites with a uniform dispersion of carbon nanoparticles were prepared by the solution casting technique. Spectroscopic techniques were used to evaluate the distribution of carbon in the composite film. The surface morphology studies were done using Scanning Electron Microscope. The variation in crystalline property, the formation of groups and variation in direct band gap in PVA and PVA-C composite were studied by X-Ray Diffraction method, Fourier Transform Infrared Radiation - Attenuated Total Reflection and by Ultraviolet–Visible Spectroscopic study. The IV characteristics study shows the non-Ohmic behaviour and the variation in conductivity. The impedance, dielectric properties and electric modulus were evaluated. The impedance value for PVA is 700Ω, and for 0.4%C + PVA is 4.6 MΩ. The tangent loss of PVA is found to be decreased by 67% ± 2 for 0.4%C + PVA. The PVA-C is flexible, and lightweight with enhanced dielectric performance and finds its application in microwave electronics.