Abstract
Films of poly-N-methylpyrrole grown on Au electrodes can be electrochemically driven between the oxidized (conducting, dark) and neutral (insulating, light) forms in CH3,CN and H2O electrolytes. Cyclic voltammograms show that the oxidation potential of the films is considerably lower in H2O than in CH3 CN. This difference affects the optical density change that accompanies the oxidation-reduction of the films so that the maximum change in reflected light from films pulsed between oxidized and neutral states is observed at ≥ 800 nm in H2O but at 580 nm in CH3 CN. It is also shown that while the film properties of conductivity and electrochromism are closely related, it is the color change which is much more sensitive to concentration and type of electrolyte salt. Pulsing the films in 1 M aqueous solutions of MCl where M+is NH4, Me4N, or Et4N shows that the smallest cation, NH4, results in the fastest electrochromic switching speeds.
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