Microfabricated ISEs: Critical comparison of inherently conducting polymer and hydrogel based inner contacts

Róbert E. Gyurcsányi, Neeraja Rangisetty, Sarah Clifton, Bradford D. Pendley, Erno Lindner

Research output: Contribution to journalArticle

99 Citations (Scopus)

Abstract

A rigorous side by side comparison of miniature planar potassium-selective electrodes with hydrogel and potassium hexacyanoferrate(II)/(III) doped polypyrrole (PPy/FeCN) based inner contacts is presented. The planar electrodes were manufactured by screen printing as four- and five-site arrays on ceramic substrates. These electrode arrays were incorporated into a flow-through cell, which could accommodate nine electrode sites. Two identical flow cells were connected in series and the effect of the inner contacts on the analytical performance of the respective electrodes has been critically evaluated. The time necessary to reach steady state conditions has been determined and the effect of experimental parameters (temperature, ambient light intensity, CO 2, and O2 concentration of the sample) on the potential stability of the electrodes was analyzed. At controlled temperature, the drift of the planar potassium electrodes with hydrogel and PPy/FeCN solid contact were 0.11±0.02mVh-1 and 0.03±0.007mVh-1, respectively. The experimental data proved that there is no aqueous film formation between the PPy/FeCN film and the potassium-selective solvent polymeric membrane.

Original languageEnglish
Pages (from-to)89-99
Number of pages11
JournalTalanta
Volume63
Issue number1
DOIs
Publication statusPublished - May 10 2004

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Keywords

  • Conductive polymer
  • Hydrogel
  • PPy/FeCN
  • Planar potassium selective electrode
  • Solid inner contact

ASJC Scopus subject areas

  • Analytical Chemistry

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