Combination of the optical waveguide lightmode spectroscopy method with electrochemical measurements

I. Szendro, K. Erdélyi, M. Fábián, Zs Puskás, N. Adányi, K. Somogyi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Optical waveguides are normally sensitive to the surrounding media and also to the surface contaminations. The effective refractive index changes at the surface. Various sensor systems were developed based on this effect. One of the most sensitive and effective methods is the optical waveguide lightmode spectroscopy (OWLS). At the same time, electrochemical methods are widely used both in inorganic and organic chemistry, and also advantages in microbiology were demonstrated. In this work, efforts are made and results are presented for the combination of these two methods for simultaneous measurement of refractive index and electrical current changes caused by the presence of cells/molecules/ions to be investigated. An electrically conductive indium tin oxide (ITO) nanolayer is deposited and activated on the top of the OWLS planar waveguide oxide layer. ITO layers serve as working electrodes in the electrochemical measurements. The basic setup and an integrated system are demonstrated here. Measurements using H2O2, toluidine blue solutions, and KCl and TRIS solutions as buffer and transport media are represented. Measurements show both the changes detected by the sensor layer and the effect of the applied potential in cyclic and chrono voltammetric measurements. Results demonstrate an effective combination of optical and electrochemical methods.

Original languageEnglish
Pages (from-to)8165-8169
Number of pages5
JournalThin Solid Films
Volume516
Issue number22
DOIs
Publication statusPublished - Sep 30 2008

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Keywords

  • Electrochemistry
  • Indium tin oxide
  • Lightmode spectroscopy
  • Microbiology
  • Planar optical waveguides
  • Silicon titanium oxide
  • Transparent conductive oxides

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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