Microcavity based solid-contact ion-selective microelectrodes

Fredrik Sundfors, Róbert Bereczki, Johan Bobacka, K. Tóth, Ari Ivaska, R. Gyurcsányi

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

A novel design and fabrication procedure is proposed for the preparation of robust ionophore based ion-selective microelectrodes. The essential component of the new design is a microcavity that is formed after recessing a voltammetric inlaid disk type gold microelectrode by chemical etching of the gold microwire. The microcavity of ca. 50 pL volume and 25 μm diameter accommodates the inherently conducting polymeric inner contact and the ion-selective liquid membrane, which are thereby mechanically protected from the sample environment. As inner contacts poly(3,4-ethylenedioxythiophene) (PEDOT) films doped with poly(4-styrenesulfonate) (PSS) and tetrakis[3,5-bis-(trifluoromethyl)phenyl] borate (TFPB) electropolymerized from aqueous and organic solvents, respectively, were used. Potassium- and calcium-selective microelectrodes fabricated according to the new procedure exhibited potentiometric characteristics similar to the conventional electrodes. The formation of an aqueous layer below the ion-selective membrane could be avoided by using the proposed electrode construction.

Original languageEnglish
Pages (from-to)1372-1378
Number of pages7
JournalElectroanalysis
Volume18
Issue number13-14
DOIs
Publication statusPublished - Jul 2006

Fingerprint

Microcavities
Microelectrodes
Ion selective membranes
Ions
Gold
Ionophores
Liquid membranes
Electrodes
Organic solvents
Potassium
Calcium
Etching
Fabrication

Keywords

  • Inherently conducting polymers
  • Ion-selective microelectrode
  • Microcavity
  • PEDOT
  • Solid contact

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Microcavity based solid-contact ion-selective microelectrodes. / Sundfors, Fredrik; Bereczki, Róbert; Bobacka, Johan; Tóth, K.; Ivaska, Ari; Gyurcsányi, R.

In: Electroanalysis, Vol. 18, No. 13-14, 07.2006, p. 1372-1378.

Research output: Contribution to journalArticle

Sundfors, F, Bereczki, R, Bobacka, J, Tóth, K, Ivaska, A & Gyurcsányi, R 2006, 'Microcavity based solid-contact ion-selective microelectrodes', Electroanalysis, vol. 18, no. 13-14, pp. 1372-1378. https://doi.org/10.1002/elan.200603541
Sundfors, Fredrik ; Bereczki, Róbert ; Bobacka, Johan ; Tóth, K. ; Ivaska, Ari ; Gyurcsányi, R. / Microcavity based solid-contact ion-selective microelectrodes. In: Electroanalysis. 2006 ; Vol. 18, No. 13-14. pp. 1372-1378.
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