Francesc Estranya,*, Ramon Olivera, Elaine Armelínb, José Ignacio Iribarenb, Francisco Liesac, Carlos Alemánb,*
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
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