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Sensors 2009, 9(12), 9805-9815;

SAW RFID-Tags for Mass-Sensitive Detection of Humidity and Vapors

Department of Analytical Chemistry and Food Chemistry, University of Vienna, Waehringer Strasse 38, A-1090 Vienna, Austria
Chair of Measuring Technique and Control Engineering, Bayreuth University, Universitätsstraße 30, D-95440 Bayreuth, Germany
Author to whom correspondence should be addressed.
Received: 26 October 2009 / Revised: 12 November 2009 / Accepted: 15 November 2009 / Published: 3 December 2009
(This article belongs to the Section Chemical Sensors)
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One-port surface acoustic wave (SAW) devices with defined reflector patterns give characteristic signal patterns in the time domain making them identifiable and leading to so-called RFID-Tags. Each sensor responds with a burst of signals, their timed positions giving the identification code, while the amplitudes can be related to the analyte concentration. This paper presents the first combination of such a transducer with chemically sensitive layer materials. These include crosslinked polyvinyl alcohol for determining relative humidity and tert-butylcalix[4]arene for detecting solvent vapors coated on the free space between the reflectors. In going from the time domain to the frequency domain by Fourier transformation, changes in frequency and phase lead to sensor responses. Hence, it is possible to measure the concentration of tetrachloroethene in air down to 50 ppm, as well as 1% changes in relative humidity. View Full-Text
Keywords: SAW; RFID-Tag; calix[n]arene; humidity; VOC sensing SAW; RFID-Tag; calix[n]arene; humidity; VOC sensing
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Lieberzeit, P.A.; Palfinger, C.; Dickert, F.L.; Fischerauer, G. SAW RFID-Tags for Mass-Sensitive Detection of Humidity and Vapors. Sensors 2009, 9, 9805-9815.

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