Vapor recognition with an integrated array of polymer-coated flexural plate wave sensors |
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| Affiliation: | 1. Department of Environmental Health Sciences, University of Michigan, Ann Arbor, MI 48109-2029, USA;2. Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-2029, USA;1. Univ Lyon, CNRS, Université Claude Bernard Lyon 1, Ens de Lyon, Institut des Sciences Analytiques, UMR 5280, 5 rue de la Doua, F-69100 Villeurbanne, France;2. IFP Énergies nouvelles – établissement de Lyon, Expérimentation Procédés, Rond-point de l’échangeur de Solaize, BP3, 69360 Solaize, France;1. Department of Electronic Engineering University of Rome Tor Vergata, via del Politecnico, 1, 00133 Roma, Italy;2. Centro Studi e Documentazione sulla Sensoristica, University of Rome Tor Vergata, via del Politecnico, 1 00133 Roma, Italy;3. IDASC—CNR via fosso del Cavaliere, Area di Ricerca di Tor vergata, Roma, Italy;4. Unit of Electronics for Sensor Systems, Department of Engineering, Università Campus Bio-Medico di Roma, Italy;5. Department of Physics, Chemistry and Biology, Linkoping University, Linkoping, Sweden;1. School of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China;2. College of Food Science and Technology, Hunan Province Key of Food Science and Biotechnology, Hunan Agricultural University, Changsha 410128, Hunan, China;3. Department of Physical Sciences, Charleston Southern University, North Charleston, SC, USA |
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| Abstract: | Preliminary testing of a prototype instrument employing an integrated array of six polymer-coated flexural plate wave (FPW) sensors and an adsorbent preconcentrator is described. Responses to thermally desorbed samples of individual organic solvent vapors and binary and ternary vapor mixtures are linear with concentration, and mixture responses are equivalent to the sums of the responses of the component vapors, which co-elute from the preconcentrator in most cases. Limits of detection as low as 0.3 ppm are achieved from a 60-s (34 cm3) air sample and peak widths at half-maximum range from 1 to 4 s. Tests at different flow rates suggest that the kinetics of vapor sorption in the sensor coating films may limit responses at higher flow rates, however, low data acquisition rates may also be contributory. Assessments of array performance using independent test data and Monte Carlo simulations with pattern recognition indicate that individual vapors and certain binary and ternary mixtures can be recognized/discriminated with very low error. More complex mixtures, and those containing homologous vapors, are problematic. This is the first report demonstrating multi-vapor analysis with an integrated FPW sensor array. |
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