Polymeric electrodes

We report experiments on conducting polymer polypyrrole leading to sensor a pplications. The resonance frequency, stability and sensitivity of AT-cut q uartz crystals, electrochemically covered with polypyrrole tosylate: were t asted under various operating conditions, The interaction of this organic s emiconductor with thin metallic films was analysed by photoelectron investi gations. Shifts of the valence band spectra during silver deposition are ex plained by the neutralization of positive charged surface defects. Thus the existence of a space charge region in polypyrrole is demonstrated spectros copically. (C) 2000 Elsevier Science Ltd. All rights reserved.