Ferrocene-containing polyelectrolyte multilayer film-covered electrodes: Electrocatalytic determination of ascorbic acid and use of inner blocking layers to improve the upper detection limit of the electrodes

Aihua Liu, Jun Ichi Anzai

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

A multilayer film composed of ferrocene(Fc)-appended poly(allylamine hydrochloride) (Fc-PAH) and poly(potassium vinylsulfate) (PVS) has been prepared on the surface of a gold(Au) electrode by using a layer-by-layer self-assembly technique. Fc-containing polyelectrolyte multilayer (PEM) film-modified electrodes can electrochemically catalyze the oxidation of ascorbic acid successfully. For a 2 (Fc-PAH/PVS) bilayer-covered electrode the catalytic current increased linearly with increasing concentration of ascorbic acid over the concentration range 6 μmol L-1-3 mmol L -1. To extend the dynamic range for ascorbic acid, the surface of the Au electrode was first covered with a (PAH/PVS)2 film on which an additional (Fc-PAH/PVS)5 film was coated. This strategy successfully extended the dynamic range of the electrode up to 25 mmol L -1 ascorbic acid, because the (PAH/PVS)2 layer blocked access of ascorbic acid to the electrode surface. The upper detection limit of the (PAH/PVS)2 (Fc-PAH/PVS)5 film-modified electrode is much higher than those of Fc-based ascorbic acid sensors reported so far. Electron transfer is diffusion-controlled within the (PAH/PVS) 2(Fc-PAH/PVS)5 film.

Original languageEnglish
Pages (from-to)98-103
Number of pages6
JournalAnalytical and Bioanalytical Chemistry
Volume380
Issue number1
DOIs
Publication statusPublished - 2004 Sep 1

Keywords

  • Ascorbic acid
  • Dynamic detection range
  • Ferrocene
  • Inner blocking layer
  • Polyelectrolyte multilayer film

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry

Fingerprint Dive into the research topics of 'Ferrocene-containing polyelectrolyte multilayer film-covered electrodes: Electrocatalytic determination of ascorbic acid and use of inner blocking layers to improve the upper detection limit of the electrodes'. Together they form a unique fingerprint.

Cite this