Facile synthesis of high density polypyrrole nanofiber network with controllable diameters by one step template free electropolymerization for biosensing applications

In this paper, we report fabrication of enzymatic glucose biosensor based on growth of high density polypyrrole (PPy) nanofiber network using one step template free electropolymerization method. PPy was grown potentiostatically on gold coated glass substrates. Significant changes in the sensing response were observed for biosensors fabricated with different concentrations of pyrrole (Py) monomer and polymerization potentials. Among the fabricated biosensors, the highest sensitivity of 1.9 mA cm−2 M−1, with a wide range of linear operation (125 μM-11.25 mM) was observed for 0.15 M Py concentration and 0.8 V polymerization potential. The observed results indicate that low monomer concentration and moderately low polymerization potential is highly suitable for growth of PPy nanofiber network with controllable fiber diameters having high aspect ratio, resulting in high sensitivity for biosensor application.