Polyaniline and poly(flavin adenine dinucleotide) doped multi-walled carbon nanotubes for p-acetamidophenol sensor

Abstract

A conductive biocomposite film (MWCNTs–P ANIFAD) which contains multi-walled carbon nanotubes (MWCNTs) along with the incorporation of poly(aniline) and poly(flavin adenine dinucleotide) co-polymer (P ANIFAD) has been synthesized on gold and screen printed carbon electrodes by potentiostatic methods. The presence of MWCNTs in the MWCNTs–P ANIFAD biocomposite film enhances the surface coverage concentration ( Γ) of P ANIFAD and increases the electron transfer rate constant ( k s) to 89%. Electrochemical quartz crystal microbalance studies reveal the enhancements in the functional properties of MWCNTs and P ANIFAD present in MWCNTs–P ANIFAD biocomposite film. Surface morphology of the biocomposite film has been studied using scanning electron microscopy and atomic force microscopy. The surface morphology results reveal that P ANIFAD incorporated on MWCNTs. The MWCNTs–P ANIFAD biocomposite film exhibits promising enhanced electrocatalytic activity towards the oxidation of p-acetamidophenol. The cyclic voltammetry has been used for the measurement of electroanalytical properties of p-acetamidophenol by means of P ANIFAD, MWCNTs and MWCNTs–P ANIFAD biocomposite film modified gold electrodes. The sensitivity value of MWCNTs–P ANIFAD film (88.5 mA mM −1 cm −2) is higher than the values which are obtained for P ANIFAD (28.7 mA mM −1 cm −2) and MWCNTs films (60.7 mA mM −1 cm −2). Finally, the flow injection analysis (FIA) has been used for the amperometric detection of p-acetamidophenol at MWCNTs–P ANIFAD film modified screen printed carbon electrode. The sensitivity value of MWCNTs–P ANIFAD film (3.3 mA mM −1 cm −2) in FIA is also higher than the value obtained for MWCNTs film (1.1 mA mM −1 cm −2).