Impedance Spectroscopy of PVA/GO Nanocomposites by Considering GO Intrinsic Resistivity

This study investigates the electrical properties of polyvinyl alcohol-graphene oxide (PVA-GO) nanocomposites. PVA-GO samples with different concentrations of GO (۵%, ۱۰%, ۱۵%, and ۲۰ wt%) were prepared and characterized using various techniques including Fourier transform infrared spectroscopy, scanning electron microscopy, impedance spectroscopy, and dielectric spectroscopy. The results showed that increasing the concentration of GO in PVA-GO samples leads to a decrease in the electrical resistivity. The electrical percolation threshold was detected near ۱۵ wt% of GO. Furthermore, the impedance spectroscopy analysis revealed that the sample with ۲۰ wt% of GO has the lowest real impedance, indicating a higher electrical conductivity. The results show that GO is neither an electrically conductive filler nor an excellent insulating material. Excellent dispersion of GO in PVA due to their very good interactions does not provide a complete percolation curve saying that electrical conductivity of filler has strong effect on the location of percolation point. Furthermore, impedance spectroscopy analysis revealed that the sample containing ۲۰ wt% of GO exhibited excellent dielectric response.