Poly(vinylferrocenium) perchlorate-polyaniline (PVF + -PANI) composite film was synthesized electrochemically on Pt electrode in a methylene chloride solution containing a mixture of poly(vinylferrocene) (PVF) polymer and aniline monomer. PVF + polymer in the composite film was used as an electron transfer mediator. The composite coating showed significant electrochemical activity towards hydroquinone (HQ) at pH 4, with high sensitivity and a wide linearity range. The interaction of HQ with PVF + and PANI homopolymer films was investigated electrochemically and spectroscopically. HQ molecules are accumulated on the electrode surface due to trapping by both polymers in the composite film and then oxidized catalytically by PANI. The most significant contribution of PVF + polymer is that it facilitates electron transfer in the composite film. The linear response range was found to be between 1.60×10 −4 mM and 115 mM (R 2 =0.999) at 0.45 V vs saturated calomel electrode. The limit of detection (LOD) was 4.94×10 −5 mM.
A new surface based on poly(vinylferrocenium)perchlorate-polyaniline (PVF + ClO 4 --PANI)composite-modified platinum electrode was prepared electrochemically to combine the electrocatalytic properties of an intrinsically conducting polymer and a redox polymer. The composite film was synthesized as a bilayer from individual polymerization solutions. Furthermore, PVF + ClO 4 -and PANI polymers were simultaneously deposited as a mixture from a methylene chloride solution containing PVF polymer and aniline monomer on Pt electrode. When PVF + ClO 4 -and PANI were codeposited by cycling the potential between 0.20 and 1.80 V vs Ag|AgCl, these polymers were encapsulated within each other. The encapsulation of PVF + ClO 4 -inside the growing PANI polymer provided the retainment of PVF + ClO 4 -on the electrode surface even if it was in dedoped form (PVF). This composite film was characterized by cyclic voltammetry, FTIR, SEM and conductivity measurements. The response of the composite film to catechol and hydroquinone was investigated by chronocoulometry in aqueous medium. It was found that the increase in charge consumption for catechol and hydroquinone was observed up to 7.5 and 5.0 times, respectively, when compared to that of PANI film. This might be due to the presence of PVF + ClO 4 -in the composite film, which played an important role in accelerating the electron transfer.Polyaniline (PANI) is one of the most extensively investigated intrinsically conducting polymers with commercial significance due to its high conductivity, good redox reversibility and stability in aqueous solutions and air for its applications in rechargeable batteries and environmental stability, as well as ease of synthesis 1-4 . PANI has many application areas such as
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