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Redox Properties of Ferricyanide Ion on Layer‐by‐Layer Thin Film‐Coated Gold Electrodes; Effects of Type of Polycationic Components in the Film
Author(s) -
Takita Ryoichi,
Okamura Yukiko,
Endo Yoshihiro,
Anzai Junichi
Publication year - 2006
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200603564
Subject(s) - ferricyanide , layer (electronics) , electrode , redox , layer by layer , materials science , ion , electrochemistry , thin layer , thin film , inorganic chemistry , chemistry , nanotechnology , chemical engineering , organic chemistry , engineering
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) 6 ] 3− ) on the LbL film‐coated Au electrodes were studied. The LbL film‐coated electrodes exhibited redox response to [Fe(CN) 6 ] 3− ion when the outermost surface of the LbL film was covered with the cationic poly(amine)s while virtually no response was observed on the LbL film‐coated electrodes whose outermost surface was covered with PVS due to an electrostatic repulsion between [Fe(CN) 6 ] 3− ion and the negatively‐charged PVS layer. The redox properties of [Fe(CN) 6 ] 3− ion on the LbL film‐coated electrodes significantly depended on the type of polycationic materials in the LbL film. The LbL film‐coated electrodes which had been immersed in the [Fe(CN) 6 ] 3− solution for 15 min exhibited redox response even in a [Fe(CN) 6 ] 3− ion‐free buffer solution, suggesting that [Fe(CN) 6 ] 3− ion is confined in the films. In the buffer solution, redox peaks were observed between +0.1 and 0.4 V depending on the type of polycations in the film. Thus, [Fe(CN) 6 ] 3− ion can be confined in the film and the redox potential is polycation‐dependent.