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Proceedings Paper

New Optical Chemical Sensors Based On The Langmuir-Blodgett Technique
Author(s): Bernhard B. P. Schaffar; Otto S. Wolfbeis
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Paper Abstract

This paper describes the application of Langmuir-Blodgett type layers in planar optical sensors for chemical parameters including alkali ions, oxygen, halides and pH. The major advantages of LB layer based sensors are the ease of reproducible fabrication, a well-defined layer thickness, and usualy quite short response times. In addition, it offers analytical possibilities not provided by thick film techniques. As a result, potentiometric measurement of boundary potentials using electrochromic dyes have become possible. On the other hand, the type of bilayers used so far is prone to mechanical disruption, and poor signal-to-noise ratios are observed. Potential future techniques will include polymeric lipid membranes, the evanescent wave technique for gathering more intense signals, and the coupling of LB techniques to fiber optic waveguides.

Paper Details

Date Published: 19 January 1989
PDF: 8 pages
Proc. SPIE 0990, Chemical, Biochemical, and Environmental Applications of Fibers, (19 January 1989); doi: 10.1117/12.959983
Show Author Affiliations
Bernhard B. P. Schaffar, Karl Franzens University (Austria)
Otto S. Wolfbeis, Karl Franzens University (Austria)


Published in SPIE Proceedings Vol. 0990:
Chemical, Biochemical, and Environmental Applications of Fibers
Robert A. Lieberman; Marek T. Wlodarczyk, Editor(s)

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