Change from a bulk to a surface coupling mechanism in the electrochemical polymerization of thiophene



: Visy C, Lukkari J, Kankare J

Publisher: ELSEVIER SCIENCE SA LAUSANNE

: 1997

: Synthetic Metals

: SYNTHETIC METALS

: SYNTHETIC MET

: 87

: 1

: 81

: 87

: 7

: 0379-6779

DOI: https://doi.org/10.1016/S0379-6779(97)80101-4


The electrochemical polymerization of thiophene has been studied by spectrovoltammetric, spectrogalvanostatic and electrochemical quartz-crystal microbalance (EQCM) techniques. Experimental support was found for a change from a bulk to a surface coupling mechanism during the process at weakly adsorbing electrodes like indium-tin oxide (ITO). This conclusion has gained further proof from experiments in connection with the effect of a strong deprotonating agent (DBN). It was observed that the solution phase inhibitor is inefficient when it was added only during the process, when the surface had already been covered by a prepolymerized layer. The film formation undisturbed by the late addition of the inhibitor was illustrated by evidence obtained from spectroelectrochemical and EQCM measurements.



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