Redox properties of ferricyanide ion on layer-by-layer deposited poly(glutamic acid) film-coated electrodes and its use for electrocatalytic sensing of ascorbic acid

Ryoichi Takita, Kentaro Yoshida, Jun ichi Anzai

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Layer-by-layer (LbL) thin films composed of poly(allylamine hydrochloride) (PAH) and poly(glutamic acid) (PGA) were prepared on the surface of a gold (Au) electrode to study the redox properties of [Fe(CN)6]3- ion on the modified electrodes. 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 PAH while the response was suppressed on the LbL film-coated electrodes whose outermost surface was covered with PGA due to an electrostatic repulsion between [Fe(CN)6]3- ions and the negatively charged PGA layer. The redox properties of [Fe(CN)6]3- ion on the LbL film-coated electrodes significantly depended on the thickness of the LbL film and on pH of the [Fe(CN)6]3- solution. The thicker film-coated electrodes gave higher response than the thinner film-coated electrodes. The higher response was observed in pH 9.0 solution than in pH 7.4 and 4.0 media. The PAH-terminated LbL film-coated electrodes which had been pretreated in the [Fe(CN)6]3- solution at pH 9.0 or 7.4 for 15 min exhibited redox response even in a [Fe(CN)6]3- ion-free buffer solution, suggesting that [Fe(CN)6]3- ions are confined in the films. The [Fe(CN)6]3- ion-confined electrodes can be used for the electrocatalytic determination of a mM range of ascorbic acid in solution.

Original languageEnglish
Pages (from-to)54-60
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume121
Issue number1
DOIs
Publication statusPublished - 2007 Jan 30

Keywords

  • Ascorbic acid
  • Ferricyanide ion
  • LbL films
  • Poly(glutamic acid)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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