Opto-electrochemical planar wave-guide sensor for copper (II) ion

Barna Kovács, Géza Nagy

Research output: Contribution to journalArticle

10 Citations (Scopus)


An opto-electrochemical sensor for copper (II) ion was developed. The sensor consists of a planar conductive indium-tin-oxide (ITO) glass support, which was coated by a polymeric copper (II) sensitive membrane. The sensing membrane is made of plasticized polyurethane matrix containing Zincon colorimetric reagent immobilized as ion pair with tetraoctylammonium ion. The instrumentation used commonly for wave-guide sensor development was extended with a potentiostat that made possible the control of the electric potential of the conductive surface. In this way the transport rate of ionic species through the membrane-sample interface could be influenced. In the presence of copper (II) ions the color of the membrane turned from red to blue, which was monitored optically. By applying positive potential to the conductive surface the direction of the ion diffusion at the membrane/sample interface was changed. As a result the sensing layer was regenerated within 2 minutes and was ready for further measurement. The sensor measured Cu2+ ion in a concentration range of 1-200 μM.

Original languageEnglish
Pages (from-to)177-187
Number of pages11
JournalJournal of biochemical and biophysical methods
Issue number1-3
Publication statusPublished - Oct 1 2002


  • Copper determination
  • Electrochemically assisted
  • Planar wave-guide

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry

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