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Long-Term Stability of Polymer-Coated Surface Transverse Wave Sensors for the Detection of Organic Solvent Vapors

Stahl, Ullrich 1; Voigt, Achim 1; Dirschka, Marian 1; Barié, Nicole 1; Richter, Christiane 1; Waldbaur, Ansgar 1; Gruhl, Friederike J. 1; Rapp, Bastian E. 1; Rapp, Michael 1; Länge, Kerstin 1
1 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)


Arrays with polymer-coated acoustic sensors, such as surface acoustic wave (SAW) and surface transverse wave (STW) sensors, have successfully been applied for a variety of gas sensing applications. However, the stability of the sensors’ polymer coatings over a longer period of use has hardly been investigated. We used an array of eight STW resonator sensors coated with different polymers. This sensor array was used at semi-annual intervals for a three-year period to detect organic solvent vapors of three different chemical classes: a halogenated hydrocarbon (chloroform), an aliphatic hydrocarbon (octane), and an aromatic hydrocarbon (xylene). The sensor signals were evaluated with regard to absolute signal shifts and normalized signal shifts leading to signal patterns characteristic of the respective solvent vapors. No significant time-related changes of sensor signals or signal patterns were observed, i.e., the polymer coatings kept their performance during the course of the study. Therefore, the polymer-coated STW sensors proved to be robust devices which can be used for detecting organic solvent vapors both qualitatively and quantitatively for several years.

Verlagsausgabe §
DOI: 10.5445/IR/1000076713
Veröffentlicht am 21.11.2017
DOI: 10.3390/s17112529
Zitationen: 18
Web of Science
Zitationen: 15
Zitationen: 18
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2017
Sprache Englisch
Identifikator ISSN: 1424-8220
KITopen-ID: 1000076713
HGF-Programm 47.02.07 (POF III, LK 01) Zellpopul.auf Biofunk.Oberflächen IMT
Erschienen in Sensors
Verlag MDPI
Band 17
Heft 11
Seiten Art.Nr. 2529
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 03.11.2017
Schlagwörter surface acoustic wave; surface transverse wave; gas sensor; sensor array; electronic nose; volatile organic compounds; organic solvents; vapor; long-term stability
Nachgewiesen in Web of Science
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