Effect of Graphene Doping on structural and Electrical Properties of PAN/PPY Nanocomposites

Abstract

Through chemically polymerizing pyrrole on PAN matrix with FeCl₃ as an oxidant, conducting percentage ratios of PPY and PPY have been synthesized. Three distinct percentage changes are made to the (PAN/PPY) ratio: 90/10, 85/15, and 80/20. Through using the polymer approach, the synthesized nano composites are characterized. PAN/PPY nano composites with doped and undoped graphene have been studied for their electrical conductivity. The frequency dependent AC conductivity indicates that fluctuation in the conductivity regarding the nano composites is caused by both graphene doping and the concentration of PPY. It has been discovered that the PPy concentration and Gr doping decreased the nanocomposites' impedance. The results shown that the interfacial space charge (Maxwell Wagner) polarization is responsible for frequency-dependent dielectric constant for various composites at room temperature. Graphene doping is mainly an electronic lever: it tunes carrier density, mobility and inter-flake contact resistance. PPy concentration is mainly a structural lever: it determines whether a continuous conductive polymer network spans the insulating PAN matrix.Thus in PAN/PPy/graphene composite, the two levers co-operate rather than compete—doped graphene provides fast paths, PPy builds the bridges, and PAN supplies mechanical integrity. The change of dielectric loss as PPY percentage function is provided and analyzed. Frequency dependent dielectric loss is presented.