Abstract
We report an innovative experimental procedure to electrochemically synthesize modified polypyrrole (PPY) films, which consists in polymerizing pyrrole and an azo dye, viz. Brilliant Yellow (BY). The electrochemical polymerization of the composite PPY-BY films was carried out in an aqueous medium containing low concentrations of PY (7 mmol L -1 ) and the same molar ratio of BY. The resulting films were much thicker than those obtained by conventional electrochemical polymerization of unmodified PPY films on ITO substrates under the same experimental conditions. The thickness of the composite films was estimated to be ca 100 nm per each voltammetric cycle as compared to 5 nm from the unmodified PPY films. Furthermore, the voltammetric response of the PPY-BY films shows a stable and electroactive behavior.
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