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Proceedings Paper

Surface phenomena with organic coatings for chemical sensing
Author(s): Wolfgang Greibl; Oliver Hayden; Paul Achatz; G. Fischerauer; G. Scholl; Franz Ludwig Dickert
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Paper Abstract

The surface modification of SAW (surface acoustic wave)- and QCM (quartz crystal microbalance)-devices proves very important in chemical sensing. Silanes on one hand are very useful for hydrophobizing of quartz-surfaces whereas on the other hand thiols are used to adsorb on gold. In this way the influence of humidity on the transducers, which originates in the hydrophilicity of the quartz is decreased. These monolayers not only reduce the cross-sensitivity to water but also enhance the sensor effects of solvent vapors. In order to obtain better selectivity molecular hollows, like calix[n]arenes can be attached to the spacers. Another way to improve the selectivity was found in the treatment of the device with mixtures of silanes and thiols, respectively. In this way cavities are produced in which analytes are incorporated and thus are detected in the lower ppm range. The surface of mass-sensitive devices was also modified in order to detect analytes in the nano- to micrometer range. Here a stamping process with cells yields patterns on polymer surfaces which favor the reinclusion of these microorganisms. These effects are due to geometrical effects and chemical interactions via an adapted polarity and hydrogen bonds of the chosen polymer. The sensor responses proved highly selective to the bacteria in respect to nutrient liquid and other microorganisms.

Paper Details

Date Published: 22 February 2002
PDF: 9 pages
Proc. SPIE 4576, Advanced Environmental Sensing Technology II, (22 February 2002); doi: 10.1117/12.456953
Show Author Affiliations
Wolfgang Greibl, Univ. Wien (Austria)
Oliver Hayden, Univ. Wien (Austria)
Paul Achatz, Univ. Wien (Austria)
G. Fischerauer, EPCOS AG and BSC AG (Germany)
G. Scholl, EPCOS AG and BSC AG (Germany)
Franz Ludwig Dickert, Univ. Wien (Austria)

Published in SPIE Proceedings Vol. 4576:
Advanced Environmental Sensing Technology II
Tuan Vo-Dinh; Stephanus Buettgenbach, Editor(s)

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