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Electrochemistry Of Conductive Polymers. XXIV. Polypyrrole Films Grown At Electrodes Modified With β‐Cyclodextrin Molecular Templates

Joo-Yul Lee, Su-Moon Park
Published 2000 · Chemistry

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Electrochemical properties of polypyrrole films grown in 0.10 M LiClO 4 acetonitrile solutions (+2% H 2 O) at gold electrodes modified with thiolated β-cyclodextrin (β-CD) self-assembled monolayers (SAMs) have been investigated using cyclic voltammetry, electrochemical impedance spectroscopic measurements, and scanning electron microscopy. The polymerization reaction rate displayed a 0.68th order with respect to the pyrrole concentration and a 0.41 th order with respect to the amount of polypyrrole. The initial growth rate of polypyrrole at the SAM-modified electrode was slower than that at bare gold electrodes. The polypyrrole films grown galvanostatically at the SAM-modified electrodes showed the spectroscopic characteristics of nanosized polymer fibers, as well as lower distributed capacitance, than those grown at bare gold electrodes under otherwise the same experimental conditions. Scanning electron microscopic pictures reveal that the thiolated β-CDs act as molecular templates to restrict the growth sites within the β-CD cavities.



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