Abstract
Chemosensory devices with self organized structures and artificial receptors are developed for a wide field of applications. Supramolecular hosts, highly ordered liquid crystal phases and even Langmuir Blodgett films are promising recognition elements. Cage compounds such as tert-butyl-calix[n]arene show high preorganization due to their rigid walls and form highly symmetrical cavities suitable for host guest inclusion of analytes. Disturbance of the highly ordered cholesteric and nematic phases influences the optical and dielectric properties of these materials. The dielectric response can be enhanced by combining the nematic phases with paired dipoles. These changes can be used for optical and very sensitive capacitive sensing for the detection of solvent vapors down to a concentration of a few ppm. The spontaneous self organization of Langmuir Blodgett films can directly be followed by QCM measurements in solution. Designing the topology of these monolayers by applying different kinds of spacers leads to a 2 dimensional sensor coating capable of incorporating analytes. Mass sensitive measurements provide the selective detection of distinct analytes as well as the characterization of complex mixtures. With this it is even possible to discriminate used automotive oil from a new one in the gas phase.
| Original language | English |
|---|---|
| Pages (from-to) | 116-123 |
| Number of pages | 8 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 3857 |
| State | Published - 1999 |
| Externally published | Yes |
| Event | Proceedings of the 1999 Chemical Microsensors and Applications II - Boston, MA, USA Duration: 19 Sep 1999 → 20 Sep 1999 |