Abstract
A new experimental arrangement is described whereby thin films (about 1 μm thick) of polypyrrole have been electrochemically deposited onto a silicon rod single crystal that forms an element of the cylindrical internal reflectance (CIR) accessory of an FT-IR spectrometer. Polypyrrole was deposited from acetonitrile solutions of pyrrole in the presence of lithium perchlorate, tetrabutylammonium perchlorate and tetrabutylammonium tetrafluoroborate. Excellent quality in situ ATR-FT-IR spectra have been obtained over a range of potentials, with no solvent interference, showing systematic changes in spectra with the progressive oxidation and reduction of the polymer film. Both anions and cations are found to be present in both oxidized and reduced polypyrrole.
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