Use of polythiophene and poly(thiophene-3-acetic acid) as charge-selective films for amperometric flow-cell detectors

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Abstract
A new method for preparing charge-selective polythiophene and polythiophene-3-acetic acid films is described. The polymers were coated onto a micro-flow-cell electrode using constant current electrochemical polymerization. These polymer-modified electrodes exhibited charge-selective responses towards ascorbic acid, catechol and dopamine, when polymerized from solutions containing optimum amounts of water. Investigations by infrared and X-ray photoelectron spectroscopies showed that electron-rich hydroxy, carbonyl and carboxyl groups were responsible for polythiophene's charge-selective property. Whereas, poly(thiophene-3-acetic acid) is inherently charge-selective, and its charge-selective property was observed only when the porosity of the film was increased by the impeding effect of water on polymer growth during polymerization.

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