Electrochemically deposited polypyrrole films and their characterization |
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| Authors: | J. Tietje-Girault,C. Ponce de Leó n,F.C. Walsh |
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| Affiliation: | a Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street Glasgow, G1 1XL Scotland, UK
b Electrochemical Engineering Group, School of Engineering Sciences, University of Southampton, Highfield, Southampton SO17 1BJ, UK |
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| Abstract: | Ionically conductive polypyrrole films have been deposited at 295 K from anhydrous acetonitrile, acetonitrile/H2O and NaBF4 aqueous solutions onto platinum, mild steel and stainless steel discs, using cyclic voltammetry, potentiostatic and galvanostatic techniques. Cyclic voltammetry of the polymer films has been studied as a function of water content of the acetonitrile solvent, polypyrrole concentration and potential sweep rate. Potentiostatic growth of thicker (< 30 micron) films on stainless steel allowed free-standing polypyrrole membranes to be produced. Well adherent and conductive films were deposited at constant potential in stirred solutions from acetonitrile electrolytes containing 1% (v/v) of water. The membrane resistivity of the reduced films in 0.5 mol dm− 3 KCl(aq) at 295 K was ≈ 1 × 106 Ω cm, while the resistivity of the oxidised membrane was 2700 Ω cm. |
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| Keywords: | Conductive polymers Polymer membrane Polypyrrole formation Pyrrole oxidation |
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