Heparin (HEP) and κ-carrageenan (CAR) were used for constructing thin films on the surface of a gold (Au) electrode and redox properties of ferricyanide ions, Fe(CN) 6 3-, on the film-coated electrodes were studied. HEP- and CAR-containing thin films were successfully prepared by layer-by-layer (LbL) deposition of the polysaccharides and poly(allylamine hydrochloride) (PAH). Fe(CN) 6 3- ions penetrated the LbL-deposited films to exhibit redox reactions on the Au electrodes when the outermost surface of the film was covered with PAH. On the other hand, penetration of Fe(CN) 6 3- ions was suppressed when the surface of the film was covered with HEP or CAR. The results were rationalized on the basis of electrostatic repulsion between Fe(CN) 6 3- anion and negative charges in HEP and CAR. In addition, Fe(CN) 6 3- ions were confined in the LbL films and the confined Fe(CN) 6 3- ions were successfully used for the electrocatalytic oxidation of ascorbic acid.
|Number of pages||9|
|Journal||International Journal of Electrochemical Science|
|Publication status||Published - 2012 Aug 1|
- Ferricyanide ion
- Layer-by-layer film
ASJC Scopus subject areas