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On the p-doping of PEDOT layers in various ionic liquids studied by EQCM and acoustic impedance |
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| Authors: | Adriana Ispas Andreas Bund Igor Efimov |
| Affiliation: | a Technische Universität Dresden, Lehrstuhl für Physikalische Chemie und Elektrochemie, Bergstr. 66b, Dresden, D-01062, Germany b Università di Lecce, Dipartimento di Ingegneria dell’Innovazione, Lecce, I-73100, Italy c University of Leicester, Department of Chemistry, Leicester, LE1 7RH, United Kingdom |
| Abstract: | 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 °C and 85 °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 107 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. |
| Keywords: | Electrochemical quartz crystal microbalance (EQCM) Poly(3,4-ethylenedioxythiophene) (PEDOT) Electropolymerization Ionic liquids Acoustic impedance |
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