M ethanol oxidation on the GC electrod e surface modified with nano- pa rticles Fe۲O۳

Chemical modified electrodes (CMEs) be come a field of exiting research du e to their unique electr ode surfaces properties [ ۱]. Many techniques w ere develope d for preparation of modifie electr odes, such as covalent bonding and polymer film [۲]. D eposit a fil m of condu cting polymer was essential to work in a medium with an electrolyte that can protect the elec trode surface from dissolution with out impedi ng the electropolymerization process [۳]. Polymeric films possess three-dimension al extensity, a large number of reactive sites, g ood stability and offer the possibilit y to be designed with particular redox active sites [۴]. Elect ropolymeri zation is a good approa ch to immobilize polym er as adjusting the electrochemica l parameters can control film thick ness, permiti on and charge transport characteristics [۵].Exper imental:Electrochemical impedance spectroscop y (EIS) wa s performed with a fre quency response detector EG&G model ۱۰۲۵ USA and Scanning electron microscopy (SEM) images were taken using a VEGA HV (high potential) ۱۵۰۰ V at various ma gnifications . A conventional three-electrode sy stem was employed using workin g electrode (GCE), reference elec trode (SCE) and countrer electrode (Pt). Phosp hate buffer solutions (P BS) were p repared by ۰.۱M NaH۲ PO۴ – Na۲H PO۴ The el ectropolymerization w as carried out using th e solution having ۱.۰×۱ ۰-۳ M (m-A BA) and ۰. ۰۲ mgr nan osilica at pH ۷.۰ PBS. The impedance spectra were recorded in the fre quency ran ge ۱۰ Hz to ۶۵k Hz.