ISSN:
1662-0356
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Natural Sciences in General
,
Technology
Notes:
Chemical sensing is a key application of bio-inspired smart materials. Artificialnanostructured layers mimicking biorecognition are synthetically accessible e.g. by imprintingtechniques or affinity material nanoparticles. Hence, for detecting extremely malodorous organicthiols (butane/octance thiol), we designed molybdenum disulphide nanoparticles. In contrast to softmetals (e.g. gold) they interact with the SH-group fully reversibly leading to one of the first realQCM sensors for these compounds. Rationally varying the surface of the recognition materialallows for optimizing the interaction properties. Electrolyzed gold e.g. shows sensor effects beingabout an order of magnitude higher than screen printed electrodes. Furthermore, molecularimprinting leads to highly selective cavities in polymers (polyurethanes, -styrenes, -acrylates) fordetecting odorous compounds, e.g. aliphatic alcohols, ethyl acetate and limonene. With thesematerials, we designed an electronic nose for monitoring plant degradation processes based on asix-electrode QCM (quartz crystal microbalance) array. With a variety of degrading materials(grass, fruit, conifers), it determines the above analytes down to some ppm directly on-line. Theconcentration data can be extracted from the E-nose frequency shifts by Neural Networks andvalidated by GC-MS
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.58.103.pdf
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