Journal
ELECTROCHIMICA ACTA
Volume 54, Issue 20, Pages 4668-4675Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.03.056
Keywords
Electrochemical quartz crystal microbalance (EQCM); Poly(3,4-ethylenedioxythiophene) (PEDOT); Electropolymerization; Ionic liquids; Acoustic impedance
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Funding
- Alexander von Humboldt Foundation
- Deutsche Forschungsgemeinschaft
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Poly(3,4-ethylenedioxythiophene) (PEDOT) films have been polymerized in several ionic liquids on the polycrystalline gold electrode of an electrochemical quartz crystal microbalance (EQCM) at 25 degrees C and 85 degrees C. Under cyclic potential variation, the EQCM resonance frequency decreased in the anodic potential region, indicating that the p-doping process is accompanied by the incorporation of anions. Elastic shear moduli G', G '' - calculated from acoustic impedance measurements - were about 10(7) Pa, values that are 2 orders of magnitude higher than for PEDOT polymerized in acetonitrile solutions. This difference is explained by the stiffening of the film by incorporated charged species because of the absence of a neutral molecular solvent plasticizing the film. (C) 2009 Elsevier Ltd. All rights reserved.
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