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 journalArticlepeer-review

12 Citations (Scopus)
171 Downloads (Pure)


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.
Original languageEnglish
Pages (from-to)210-215
Number of pages6
JournalMicrochemical Journal
Early online date21 Feb 2018
Publication statusPublished (in print/issue) - 1 Jun 2018


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


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