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Proceedings Paper

Solid State optical potassium sensor using a potential-sensitive dye
Author(s): Otto S. Wolfbeis; Barna Kovacs; Huarui He
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Paper Abstract

In an extension of previous work on optical chemical sensors based on the use of potential- sensitive dyes incorporated in Langmuir-Blodgett films, we now describe solid-state potassium-sensitive membranes. The sensing scheme again is based on the use of valinomycin as the potassium carrier, but a plasticized pvc membrane is being used as a membrane material rather than a Langmuir-Blodgett film. A potential-sensitive dye detects the potential created at the sensor/sample interface. Unlike many other kinds of potassium optrodes, the response function is virtually independent of pH. Potassium can be continuously monitored over the concentration range from 10 - 50 (mu) M up to 10 mM, although relative signal changes do not exceed -20% at present. Membranes are designed in a way that they can be manufactured in large quantities, and the dye is compatible with LED light sources.

Paper Details

Date Published: 10 February 1995
PDF: 8 pages
Proc. SPIE 2331, Medical Sensors II and Fiber Optic Sensors, (10 February 1995); doi: 10.1117/12.629398
Show Author Affiliations
Otto S. Wolfbeis, Karl-Franzens Univ. (Austria)
Barna Kovacs, Karl-Franzens-Univ. (Austria)
Huarui He, Karl-Franzens Univ. (Austria)

Published in SPIE Proceedings Vol. 2331:
Medical Sensors II and Fiber Optic Sensors
Anna Maria Verga Scheggi; Francesco Baldini; Pierre R. Coulet; Otto S. Wolfbeis, Editor(s)

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