INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
Nanostructured Modified Electrodes: Role of ions and solvent in redox active polyelectrolyte multilayer films
MARIO TAGLIAZUCCHI; DORIS GRUMELLI; ERNESTO J. CALVO
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Royal Society of Chemistry
Año: 2006 vol. 8 p. 5086 - 5086
Electrodes modified layer-by-layer by self-assembly of redox active polyelectrolytes comprised of osmium bipyridinepyridine 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.