Electrochemical preparation and characterization of polypyrrole films in an aqueous solution containing a biocompatible surfactant

Author(s): H.Nikoofard*, Z.Kalantar, M.Omidian

Polypyrrloe (PPy) films were synthesized electrochemically by the direct anodic oxidation of pyrrole in an aqueous solution containing the environmentally friendly surfactant sodium dodecyl sulfate (SDS). The PPy/SDS filmswere characterized by cyclic voltammetry (CV), in situUV-visible spectroscopy, and scanning electron microscopy (SEM), and were then contrasted with PPy films prepared under identical conditions in the absence of SDS. The results obtained show that the rate of electropolymerization increases in the presence of SDS with the electroactive, adhesive, and homogenous polymer films onto the electrode surface.Also we found that the optimized concenteration of pyrrole for electropolymerization decreases in the presence of SDS. The CVs for the PPy/SDS films recorded at different scan rates reveal that the anodic peak currents increase with increase in the scan rate, and that the redox process is surface-controlled. The effects of electropolymerization parameters on the morphology obtained are discussed. It is proposed that the electropolymerization rate and polymer stiffness are the important factors in controlling the morphology. SEM images show that the PPy/SDS films take a small size, and extend surface particles with better diffusitywhich is affected by stabilizers. Themodel of the polymer growth is flowers-like in the absence of SDS, and it is stringlike in the SDSmedium.

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