Electrochemically deposited polypyrrole films and their characterization

Tietje-Girault, J., Ponce de León, C.A. and Walsh, F.C (2007) Electrochemically deposited polypyrrole films and their characterization. Surface and Coatings Technology, 201 (12), 6025-6034. (doi:10.1016/j.surfcoat.2006.11.009).

Record type: Article

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 x 106 ohm cm, while the resistivity of the oxidised membrane was 2700 ohm cm.

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