Electroactive Properties and Electrochemical Stability of Poly(3,4-ethylenedioxythiophene) and Poly(N-methylpyrrole) Multi-layered Films Generated by Anodic Oxidation

Francesc Estrany^a,*, Ramon Oliver^a, Elaine Armelín^b, José Ignacio Iribaren^b, Francisco Liesa^c, Carlos Alemán^b,*

^a) Unitat de Química Industrial, Escola Universitaria d’Enginyeria Técnica Industrial de Barcelona, Universitat Politécnica de Catalunya, Comte d’Urgell 187, 08036 Barcelona, Spain

^b) Departament d’Enginyeria Química, E. T. S. d’Enginyers Industrials, Universitat Politécnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain

^c) Departament d’Enginyeria Mecànica, E. T. S. d’Enginyers Industrials, Universitat Politécnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain

 

Abstract

Multi-layered films of poly(3,4-ethylenedioxythiophene), and poly(N-methylpyrrole), have been prepared using a layer-by-layer electrodeposition technique. The electrochemical properties and the conductivity of the films formed by 3, 5 and 7 layers have been compared with their homopolymers and with the copolymers prepared from 3,4-ethylenedioxythiophene and N-methylpyrrole with different concentration ratios. The electroactivity and stability of the multi-layered systems were higher than those of PEDOT homopolymer and copolymers. Furthermore, the electrochemical properties improved when the number of layers increased. In addition, the electrical conductivity of the multi-layered films is higher than those of poly(N-methylpyrrole) and copolymers, and comparable to the PEDOT homopolymers. These results indicate that multi-layered systems show better performance than their homopolymers and/or copolymers derivatives for some applications like anticorrosive coatings or sensor materials.

Keywords: poly(3,4-ethylenedioxythiophene); poly(N-methylpyrrole); multi-layered films; conducting polymers; layer-by-layer electrodeposition

 

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* Corresponding author. E-mail address: francesc.estrany@upc.edu , carlos.aleman@upc.edu