The surface of a gold (Au) electrode was coated with layer-by-layer (LbL) thin films composed of poly(vinyl sulfate) (PVS) and different type of poly(amine)s including poly(allylamine) (PAH), poly(ethyleneimine) (PEI) and poly(diallyldimethylammonium chloride) (PDDA) and redox properties of ferricyanide ion ([Fe(CN) 3À ion can be confined in the film and the redox potential is polycation-dependent.
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