Redox properties of ferricyanide ion on layer-by-layer thin film-coated gold electrodes; effects of type of polycationic components in the film

Ryoichi Takita, Yukiko Okamura, Yoshihiro Endo, Jun Ichi Anzai

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1627-1630
Number of pages4
JournalElectroanalysis
Volume18
Issue number16
DOIs
Publication statusPublished - 2006 Aug 1

Keywords

  • Cyclic voltammetry
  • Ferricyanide ion
  • LbL film
  • Modified electrode
  • Poly(amine)

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry

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