Key role of the desolvation in the achievement of the quasi-metallic state of electronically conducting polymers

• Published in: Electrochimica acta Vol. 50; no. 5; pp. 1247 - 1254
• Main Authors: Kriván, Emese, Visy, Csaba, Kankare, Jouko
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 15-01-2005; Elsevier
• Subjects: ac conductance; Applied sciences; Desolvation; Electronically conducting polymers; EQCM; Exact sciences and technology; Ionization properties; Organic polymers; Physicochemistry of polymers; Properties and characterization; Redox transformation; Redox transformation; ac conductance; Desolvation; EQCM; Electronically conducting polymers; Heterocyclic polymer; Lauryl sulfate; Conducting polymers; Cyclic voltammetry; Organic solvent; Phase transformation; Electrochemical properties; Acetonitrile; Redox potential; Aqueous solution; Pyrrole polymer
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2004.07.050

Redox transformation of electronically conducting polymers was studied by different in situ combined electrochemical techniques. Results obtained with polypyrrole/dodecyl sulfate film in aqueous solution and with polythiophene/hexafluorophosphate films in acetonitrile by in situ ac conductance and EQCM support the assumption of the key role of the desolvation in the achievement of the so-called quasi-metallic state of electronically conducting polymers. The desolvation considered as a phase transition is the chemical background of the capacitive behaviour, and it causes the structural changes, which lead to a film in which the interchain interactions may form the large-scale conducting polymer matrix.