Investigations on synthesis and characterization of functionalized graphene sheets-polyacrylamide composites

TL;DR

This study synthesizes and characterizes FGS-PAM composites, demonstrating significant improvements in electrical conductivity and mechanical strength at 15 wt% FGS loading, highlighting their potential for advanced material applications.

Contribution

First comprehensive analysis of FGS-PAM composites showing simultaneous enhancement of electrical and mechanical properties with detailed characterization.

Findings

Electrical conductivity increased by seven orders of magnitude at 15 wt% FGS.

Mechanical properties like hardness and elastic modulus increased four to five times.

FTIR confirmed amide linkage between polymer and graphene sheets.

Abstract

The functionalized graphene sheets (FGS)-polyacrylamide (PAM) composite films have been prepared by solution cast technique. The FGS have been synthesized by thermal exfoliation of graphite oxide. Several composites with different weight % (between 0 to 25 wt %) of FGS loading in PAM have been prepared and characterized by XRD, SEM, TEM and FTIR spectroscopy. FTIR analysis revealed the existence of the amide linkage (-NHC= O) between the polymer chain and oxygenated graphene sheets. The electrical and mechanical properties of FGS-PAM composite films have been studied by employing low temperature dc electrical conductivity measurement and nanoindentation technique. A significant increase in both electrical conductivity and mechanical properties (hardness and elastic modulus) is observed at 15 wt% loading of FGS in PAM. As the FGS loading increases from 0 to 25 wt% the conductivity of composite film increases by seven orders of magnitude (~5.55x10-7 to 1.42 S/cm). The hardness and elastic modulus of FGS (~15 wt%)PAM film increased four and five fold, respectively as compared to that of PAM film. To our knowledge studies on FGS-PAM composites and also improvement of both the electrical and mechanical properties have not yet been made.