Disposable solid state pH sensor based on flavin polymer-ferrocyanide redox couples

Catherine Hegarty, Stephanie Kirkwood, Marco Cardosi, Clare Lawrence, Charlotte Taylor, Robert Smith, J Davis

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

An inexpensive and disposable screen printed sensor capable of monitoring pH is described. Based on a custom designed flavin derivative (10-(4-hydroxyphenyl) benzo[g]pteridine-2,4(3H,10H)-dione), electro-oxidation of
the phenolic substituent leads to the deposition of a redox film whose peak positions are dependent on solution pH. The ability of the film to measure pH has been demonstrated and the possibility of using ferrocyanide as an internal standard has been critically assessed. The latter provides a Nernstian response and enables the production of carbon based electrode systems without the need for silver-silver chloride reference electrodes. The disposable electrode system has been characterised and shown to be robust with a potential drift (4 mV) upon repetitive cycling.
LanguageEnglish
Pages210-215
Number of pages6
JournalMicrochemical Journal
Volume139
Early online date21 Feb 2018
DOIs
Publication statusPublished - 1 Jun 2018

Fingerprint

Solid-state sensors
pH sensors
Polymers
Electrodes
Pteridines
Electrooxidation
Silver
Carbon
Derivatives
Monitoring
Sensors
hexacyanoferrate II
4,6-dinitro-o-cresol
Oxidation-Reduction

Keywords

  • Flavin
  • Composite
  • Electrode
  • pH
  • Sensor
  • Screen Printed

Cite this

Hegarty, Catherine ; Kirkwood, Stephanie ; Cardosi, Marco ; Lawrence, Clare ; Taylor, Charlotte ; Smith, Robert ; Davis, J. / Disposable solid state pH sensor based on flavin polymer-ferrocyanide redox couples. In: Microchemical Journal. 2018 ; Vol. 139. pp. 210-215.
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Disposable solid state pH sensor based on flavin polymer-ferrocyanide redox couples. / Hegarty, Catherine; Kirkwood, Stephanie; Cardosi, Marco; Lawrence, Clare; Taylor, Charlotte; Smith, Robert; Davis, J.

In: Microchemical Journal, Vol. 139, 01.06.2018, p. 210-215.

Research output: Contribution to journalArticle

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AU - Smith, Robert

AU - Davis, J

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AB - An inexpensive and disposable screen printed sensor capable of monitoring pH is described. Based on a custom designed flavin derivative (10-(4-hydroxyphenyl) benzo[g]pteridine-2,4(3H,10H)-dione), electro-oxidation ofthe phenolic substituent leads to the deposition of a redox film whose peak positions are dependent on solution pH. The ability of the film to measure pH has been demonstrated and the possibility of using ferrocyanide as an internal standard has been critically assessed. The latter provides a Nernstian response and enables the production of carbon based electrode systems without the need for silver-silver chloride reference electrodes. The disposable electrode system has been characterised and shown to be robust with a potential drift (4 mV) upon repetitive cycling.

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