Electrochemical Fabrication of Polypyrrole/Poly(pyrrole-3-carboxylic acid)/Graphene Oxide Composite Thin Film for Biosensor Application

Abstract

An electrochemical fabrication of functionalized conducting polymer/grapheneoxide (GO) composite thin film for the detection of biomolecule were reported. Polypyrrole/poly(pyrrole-3-carboxylic acid)/graphene oxide (PPy/PP3C/GO) composite thin films weresynthesized by electropolymerization on an indium tin oxide (ITO) coated glass slide. Theeffect of concentration and composition of precursor solution on the electrochemicalbehaviour of the composited material were investigated. The PPy/PP3C/GO composite thinfilm synthesized under the optimized experimental conditions was characterized by cyclicvoltammetry (CV). In addition, the electrochemical behavior and doping/dedoping propertiesof the obtained composite thin film in a neutral phosphate-buffered saline (PBS) solutionwere also studied. Finally, the PPy/PP3C/GO composite was used to detect ascorbic acid(AA). It was found that PPy/PP3C/GO showed good electroactivity property in neutral PBSsolution and could be applied for the detection of AA. Therefore, it can be concluded that anelectrochemically fabricated PPy/PP3C/GO composite material is a promising candidate assmart material for biosensing applications.