Electrochemical impedance spectroscopy of polyelectrolyte multilayer modified gold electrodes: Influence of supporting electrolyte and temperature

• Tipo: Artigo em Revista Científica Internacional
• Data: 2005

Autores

Silva, TH (Autor) Outra; Garcia Morales, V (Autor) Outra; C. Moura (Autor) FCUP; Manzanares, JA (Autor) Outra; Silva, F (Autor) FCUP

Revista

Título: Langmuir

Vol. 21

Páginas: 7461-7467

ISSN: 0743-7463

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 45 Citações

Scopus - 29 Citações

Outras Informações

ID Authenticus: P-000-1Z2

DOI: 10.1021/la0507176

Abstract (EN): Electrochemical impedance spectroscopy and cyclic voltammetry are employed to characterize poly(styrenesulfonate)/poly(allylamine hydrochloride) multilayers assembled onto cysteamine-modified gold surfaces. The influence of the supporting electrolyte and temperature on the impedance response is studied because of both its practical interest and the need to test further the capillary membrane model recently developed by Barreira et al. [J. Phys. Chem. B 2004, 108, 17973]. The results obtained are interpreted quite satisfactorily in terms of this model, thus providing additional support to its usefulness for the description of ionic transport through polyelectrolyte multilayers. It is observed that the nature of the supporting electrolyte affects the film resistance and the electrode coverage. The temperature dependence of the diffusion coefficient is shown to follow the Arrhenius law, and the activation energy is estimated as 61 kJ/mol. Experiments with a large number of layers are also included to show that the impedance response of the multilayer then resembles that of a homogeneous membrane.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7