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Updated: Jul 26, 2026

Synthesis, Assembly, and Characterization of Monolayer Protected Gold Nanoparticle Films for Protein Monolayer Electrochemistry
Published on: October 4, 2011
Electrochemical impedance spectroscopy of polyelectrolyte multilayer modified gold electrodes: influence of
Tiago H Silva1, Vladimir Garcia-Morales, Cosme Moura
1LEQA, Laboratório de Electroquímica e Química Analítica, CIQ-L4 Departamento de Química, Faculdade de Ciências do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal. thsilva@fc.up.pt
Abstract:
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.
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