Synthesis and characterization of poly (O-anisidine) films under galvanostatic conditions by using ECP technique

In the present study, the growth mechanism of poly (o-anisidine) (POA) with supporting electrolyte H2SO4 and HCL on platinum (Pt) substrate has been investigated. The POA films on Pt substrate have been synthesized by electrochemical polymerization (ECP) of o-anisidine under galvanostatic conditions from an aqueous solution with inorganic supporting electrolyte H2SO4 and HCL at temperature 290 C. We have optimized the monomer and supporting electrolyte concentrations, pH of the solution and applied current density for better conductivity, uniform and porous surface morphology of the synthesized POA film so that it can be used for biosensor applications. The uniform, thin, porous and strongly adherent dark green POA film was synthesized at 0.2 M monomer concentration, 1 M supporting electrolyte concentration (H2SO4 and HCL), 1.0 pH and 2 mA/cm2 applied current density at temperature 290 C. The synthesized POA film was characterized by using electrochemical technique, UV-visible spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and conductivity measurement. The synthesized POA films with optimized process parameters with supporting electrolyte H2SO4 and HCL were compared for their uniformity, adherence, conductivity and porosity. It was observed that, the synthesized POA film with H2SO4 supporting electrolyte provide better polymer matrix for immobilization of biocomponant.