Novel polypyrrole based all-solid-state potassium-selective microelectrodes

Róbert E. Gyurcsányi, Ann Sofi Nybäck, Klára Tóth, Géza Nagy, Ari Ivaska

Research output: Contribution to journalArticle

92 Citations (Scopus)

Abstract

Potassium-selective potentiometric microelectrodes with a polypyrrole solid internal contact were fabricated by the application of a potassium-selective bis-crown ether ligand based, plasticized poly(vinyl chloride) (PVC) membrane to the surface of conducting polymer modified Pt, Au or C micro disk electrodes. The selectivity and sensitivity of the new type of potentiometric potassium microelectrode were found to be comparable with those of the conventional macro ion-selective electrodes and of the micropipet type microelectrodes based on the same ionophore. The ease of preparation and robustness are the main advantages of this new electrode design, which can replace the classical micropipet type microelectrodes in many applications. The microelectrodes showed good dynamic characteristics and were used successfully in a wall-jet cell incorporated flow injection analysis system and as a measuring tip in scanning electrochemical microscopy. The polypyrrole modified substrate electrodes can be made selective for different ions just by changing the ionophore in the plasticized PVC membrane, which can extend their use to a wide range of applications.

Original languageEnglish
Pages (from-to)1339-1344
Number of pages6
JournalAnalyst
Volume123
Issue number6
DOIs
Publication statusPublished - Jan 1 1998

Keywords

  • Flow injection analysis
  • Polypyrrole
  • Potassium-selective electrode
  • Potentiometric microelectrode
  • Scanning electrochemical microscopy

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy
  • Electrochemistry

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