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International Journal of Electrochemistry
Volume 2011 (2011), Article ID 379253, 11 pages
http://dx.doi.org/10.4061/2011/379253
Research Article

Electrochromism and Swelling of Polypyrrole Membranes: An Electrochemical and Ellipsometric Study

1Instituto de Fisicoquímica, INIFTA, CIC, Suc. 4, C.C. 16, 1900 La Plata, Argentina
2Facultad de Ingeniería, FICES, UNSL, 25 de Mayo 384 C.P. 5730. Villa Mercedes, San Luis, Argentina
3Departamento de Matemática, Facultad de Ciencias Exactas, UNLP, Calle 115 y 50, 1900 La Plata, Argentina

Received 18 March 2011; Accepted 16 May 2011

Academic Editor: Bengi Uslu

Copyright © 2011 J. O. Zerbino et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The growth of polypyrrole (Ppy) layers on gold electrodes in nearly neutral pH solutions is analysed using “in situ” voltametric and ellipsometric techniques. Different film structures are obtained depending on the potentiodynamic programme and the composition of the electrolyte. More compact dodecylsulphate-(DS) doped Ppy layers were grown at 1.2 V versus RHE than those obtained by applying a higher potential. The more compact layers correspond to the growth of an oxidised Ppy/DS layer that shows low pseudo capacity behaviour. After dipping, the doped Ppy/DS film in KCl solution-significant variations in optical indices and thickness are detected as a function of the applied potential. Higher electrochromism as well as decrease in film thickness after cathodisation is achieved. The optical indices and the thickness of the Ppy layer formed under different applied potential/time programmes are estimated.