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An EQCM study of the deposition and doping/dedoping behavior of polypyrrole from phosphoric acid solutions |
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| Authors: | Silvio Koehler Igor Efimov |
| Affiliation: | a Dresden University of Technology, Institute of Physical Chemistry and Electrochemistry, D-01062 Dresden, Germany b Graduate School of Engineering, Hokkaido University, N-13 W-8 Kita-Ku, 060-8628 Sapporo, Japan c University of Leicester, Department of Chemistry, Leicester LE1 7RH, UK |
| Abstract: | The potentiostatic deposition of polypyrrole (PPy) from 0.1 M aqueous phosphoric acid solution and the doping/dedoping behavior of the resulting films have been investigated by the electrochemical quartz crystal microbalance (EQCM) technique. The change of the complex shear modulus during the film growth and during the doping/dedoping were calculated using the acoustic impedance method. It was found that the films contain only ca. 1 wt% water in the oxidized state which is in accordance with their relatively high storage modulus of 38 MPa and low loss tangent of 0.05. Comparing H3PO4 (pH 1) and NaH2PO4 (pH 8) it was found that the doping/dedoping in the latter is accompanied by a strong increase of the surface roughness which is a direct result of cation exchange present at pH 8. |
| Keywords: | Poly(pyrrole) Phosphate EQCM Complex shear modulus |
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