Fullerene/liquid crystal mixtures as QMB- and SAW-coatings – detection of diesel- and solvent-vapours |
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| Authors: | F. L. Dickert Matthias E. Zenkel Wolf-Eckehard Bulst Gerhard Fischerauer Ulrich Knauer |
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| Affiliation: | Universit?t Wien, Institut für Analytische Chemie, W?hringerstrasse 38, A-1090 Wien, Austria, AT
Siemens AG, ZFE TK1 Otto Hahn Ring 6, D-81?739 München, Germany, DE
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| Abstract: | The detection of diesel fuel and different solvent vapours in air is described. Due to the very low vapour pressure of diesel fuel, highly mass sensitive quartz microbalance (QMB) and surface acoustic wave (SAW) sensors are used. Micro porous coatings are presented consisting of liquid crystals and buckminster fullerenes. Thereby the globular compound disturbs the structure of the rod-like component and cavities and channels are created. With these mixtures it is possible to attain a resolution of 0.5% of the vapour pressure of diesel in air with the QMB; an even fivefold increase of sensitivity can be obtained with highly sensitive SAW devices operating at 433 MHz. In the latter case alkylsilane monolayers are used to promote adhesion, which themselves show a similar sensitivity as the QMB, but with an instantaneous response. Received: 25 September 1995 / Revised: 7 February 1996 / Accepted: 10 February 1996 |
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