Abstract
The first steps of the electropolymerization of methyl-3-thiophene on polycrystalline platinum electrode in acetonitrile-LiClO4 has been analysed, using in-situ differential ellipsometry and rotating disk voltammetry. The optical method showed that the first step is the formation of oligomers in the solution. These oligomers precipitate onto the electrode surface when they reach a minimum length corresponding to a trimer, forming then nuclei. The polymer chain growths then by coupling with the newly electrogenerated radical cations. The rotating disk electrode study shows the influence of the forced convection on the grafting which under limit conditions, doesn't occur.
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