Process of depositing by electropolymerization a film of a composite material onto an electrically conductive surface

A process of depositing by electropolymerization a film of a composite material onto an electrically conductive surface, according to which process a mixture comprising:

• (a) a monomer which is a precursor of a non-conductive polymer,
• (b) a substance forming a dopant to be incorporated into this polymer,
• (c) a supporting electrolyte, and
• (d) an aprotic solvent
• is subjected to electrolysis wherein said conductive surface to be coated is used as cathode or as anode and wherein said cathode or anode is polarized to a potential in the range of electron transfer between the electrically conductive surface and the monomer but respectively less negative or less positive than the reaction of the aprotic solvent, to where the aprotic solvent is different from said monomer, or of the supporting electrolyte in case said surface is used as cathode or as anode, said process further comprising the step of making, prior to said electrolysis, a solution starting from said mixture;
• wherein said dopant is a substance having an electron transfer potential between two valence states in the range of electron transfer between the monomer and the electrode but respectively less negative or less positive than the reaction of the solvent, where the solvent is different from said monomer or the supporting electrolyte in the event said surface is used as cathode or as anode.