Electroactivity of transparent composite films from conducting poly(thiophenes)

Journal Article · Thu Feb 11 00:00:00 EST 1988 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100314a048· OSTI ID:5324613

Roncali, J; Garnier, F

Conducting composite films containing an electropolymerizable conducting polymer such as poly(3-methylthiophene) (PMeT) alloyed with poly(vinyl chloride) (PVC) have been prepared in a one-step process from synthesis media already containing dissolved PVC. This procedure based on the simultaneous electropolymerization and dip-cutting processes allows a large control of the composition, morphology, optical transmittance, conductivity, and electroactivity of the composite films. The growth of PMeT in synthesis media containing dissolved PVC has been analyzed. Increasing the PVC concentration produces a slight decrease of the MeT electropolymerization rate with no apparent modification of the polymerization mechanism. The electrochemical properties of the composite films have been investigated in acetonitrile by using cyclic voltammetry and chronoamperometry. At low scan rate (10 mV/s), the electrochemical responses of the composite films are identical with that of bare PMeT films prepared under the same conditions. At higher scan rates, a dependence of the electroactivity of the films on their PVC content is observed and the electrochemical response turns progressively from an adsorption-like behavior to a diffusion-controlled one. It is shown that the electrolyte concentration used for the synthesis of the composite films is the key factor controlling their electrochemical behavior. The incorporation of PMeT within the PVC matrix does not affect its spectroelectrochemical properties and furthermore leads to an improved electrochemical stability of the film under redox cycling.

• Research Organization: CNRS, Thiais (France)
• OSTI ID: 5324613
• Journal Information: J. Phys. Chem.; (United States), Vol. 92:3
• Country of Publication: United States
• Language: English

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