Clay-enhanced electrochemiluminescence and its application in the detection of glucose

Chih Sheng Ouyang, Chong Mou Wang

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Clay-modified electrodes were prepared with montmorillonite K10 and characterized in their ability to enhance the electrogenerated chemiluminescence (ECL) in a solution containing luminol and hydrogen peroxide. Montmorillonite K10 proved to be an effective catalyst for such a purpose, according to the anodic current and ECL intensity measured with the electrodes with and without clay particles. Under optimum conditions (pH 10 and 0.8 V vs. SCE), the ECL was enhanced by a factor of 10. Control experiments showed the enhanced ECL is likely due to a facilitation in the oxidation of luminol and H2O2 by the iron species contained in the clay. Double-step potential techniques suggested that superoxide is very likely to be the key reactive oxygen species involved in the clay-enhanced ECL reaction. In addition, clay/luminol/GOx electrodes were constructed by using aminopropyltrimethoxysilane as an immobilizing agent for the detection of glucose. Although the electrode sensitivity decreased by ca. 15% after 10 days, a linear calibration curve was attained, covering the concentrations of glucose from 10 μM to 0.5 mM with a detection limit at ca. 10 μM at pH 10.

Original languageEnglish
Pages (from-to)2654-2659
Number of pages6
JournalJournal of the Electrochemical Society
Volume145
Issue number8
DOIs
Publication statusPublished - 1998 Jan 1

Fingerprint

Chemiluminescence
chemiluminescence
glucose
clays
Glucose
Clay
Luminol
Bentonite
Electrodes
electrodes
montmorillonite
Clay minerals
inorganic peroxides
peroxides
hydrogen peroxide
Hydrogen peroxide
Superoxides
Hydrogen Peroxide
Reactive Oxygen Species
coverings

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

Clay-enhanced electrochemiluminescence and its application in the detection of glucose. / Ouyang, Chih Sheng; Wang, Chong Mou.

In: Journal of the Electrochemical Society, Vol. 145, No. 8, 01.01.1998, p. 2654-2659.

Research output: Contribution to journalArticle

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