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Electrochemical characterization of conducting polymers: polypyrrole

1992; Elsevier BV; Volume: 13; Issue: 3 Linguagem: Inglês

10.1016/0921-5107(92)90169-a

1873-4944

K. West, B. Zachau‐Christiansen, Torben Jacobsen, Steen Skaarup,

Analytical Chemistry and Sensors

The nature of the interaction between dopant ions and a polypyrrole host matrix is investigated. In the highly reversible form of polypyrrole used here, two types of site for dopant anions seem to exist: a set of well-defined sites that are occupied in a cooperative process at low dopant levels, and a number of less well-defined sites with varying potential energies, possibly owing to local variations in the conformation of the polymer chains. The dopant ion diffusion coefficient is approximately 50 times higher for anions occupying the disordered sites compared with those occupying the ordered sites.