Abstract
Carbazole modified polysiloxanes (CMPs) have been electrochemically cross-linked to form composite thin films containing oxidized carbazole dinners (bicarbazolyls) together with associated counter-ions. These materials have been found to undergo reversible switching between a coloured (oxidized) and clear (reduced) state. Investigations of the dynamic response reveal that the colouration step is rate-limited by charge transfer across the electrolyte-film interface essentially independent of counter-ion, while the bleaching effects are controlled by a double extraction mechanism dependent on counter-ion mobility.
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