INQUIMAE   12526
INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
artículos
Título:
Nanostructured Modified Electrodes: Role of ions and solvent in redox active polyelectrolyte multilayer films
Autor/es:
MARIO TAGLIAZUCCHI; DORIS GRUMELLI; ERNESTO J. CALVO
Revista:
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Editorial:
Royal Society of Chemistry
Referencias:
Año: 2006 vol. 8 p. 5086 - 5086
ISSN:
1463-9076
Resumen:
Electrodes modified layer-by-layer by self-assembly of redox active polyelectrolytes comprised of osmium bipyridine–pyridine derivatized poly(allyl-amine) and poly(vinyl) sulfonate have been studied by EQCM, ellipsometry, cyclic voltammetry and electrochemical impedance spectroscopy in aqueous solutions of different anions and cations. Redox driven swelling by solvent exchange during oxidation, in excess to the hydration number, occurs by perturbation of the equilibrium between the osmotic and elastic forces as a result of the electrochemical injection of charge into the film. The exchanged mass and volume change during redox switching strongly depends on the nature of the anion under anion Donnan permselectivity conditions.