Broadband dielectric relaxation investigations of polyvinyl chloride-fGO nanocomposite films

The use of polymer nanocomposites in different electrical applications stimulated the study of the dielectric properties for PVC-fGO films at different temperatures. The high values of epsilon MODIFIER LETTER PRIME of the different nanocomposites, at low frequencies, are due to the space charge effect induced by electrode polarization. The values of maximum barrier height (W-M) decrease by increasing the applied temperature whereas they are independent of the content of fGo in the different nanocomposites. The values of real dielectric modulus (MMODIFIER LETTER PRIME) decreased by increasing fGO content (except for 0.5 wt% of fGO nanofiller). A shift in the position M" peak to higher frequencies by increasing the temperature was observed. The values of sigma(AC) increase by increasing the fGO content up to 0.3 wt% while decreasing at 0.5 and 1.0 wt% of fGO. Increasing the fGO content in the nanocomposites causes the values of DC activation energy (E-DC) to increase up to 0.3 wt% of fGO then they decreased, due to the space charge effect.