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Int. J. Mol. Sci. 2010, 11(4), 1956-1972; doi:10.3390/ijms11041956

Electrochemical Analysis of Conducting Polymer Thin Films

Department of Chemical Engineering, Lamar University, P.O. Box 10053, Beaumont, TX 77710, USA
Author to whom correspondence should be addressed.
Received: 21 March 2010 / Revised: 9 April 2010 / Accepted: 20 April 2010 / Published: 26 April 2010
(This article belongs to the Special Issue Conjugated Polymers)
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Polyelectrolyte multilayers built via the layer-by-layer (LbL) method has been one of the most promising systems in the field of materials science. Layered structures can be constructed by the adsorption of various polyelectrolyte species onto the surface of a solid or liquid material by means of electrostatic interaction. The thickness of the adsorbed layers can be tuned precisely in the nanometer range. Stable, semiconducting thin films are interesting research subjects. We use a conducting polymer, poly(p-phenylene vinylene) (PPV), in the preparation of a stable thin film via the LbL method. Cyclic voltammetry and electrochemical impedance spectroscopy have been used to characterize the ionic conductivity of the PPV multilayer films. The ionic conductivity of the films has been found to be dependent on the polymerization temperature. The film conductivity can be fitted to a modified Randle’s circuit. The circuit equivalent calculations are performed to provide the diffusion coefficient values.
Keywords: electrochemical impedance spectroscopy; cyclic voltammetry; layer-by-layer deposition; poly(p-phenylene vinylene); modified Randle’s circuit electrochemical impedance spectroscopy; cyclic voltammetry; layer-by-layer deposition; poly(p-phenylene vinylene); modified Randle’s circuit
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Vyas, R.N.; Wang, B. Electrochemical Analysis of Conducting Polymer Thin Films. Int. J. Mol. Sci. 2010, 11, 1956-1972.

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