TY - GEN
T1 - Liquid-phase detection of organophosphate pesticides using guided SH-SAW sensor
AU - Mensah-Brown, A.
AU - Wenzel, M. J.
AU - Josse, F.
AU - Yaz, E.
AU - Sadik, O.
PY - 2007
Y1 - 2007
N2 - It has been established that a polymer-coated SH-SAW sensor on 36° rotated Y-cut LiTaO3 is a very sensitive platform for direct liquid-phase chemical sensing. In this work, two partially selective coatings, poly(epichlorohydrin) and Polyurethane are investigated for the detection of organophosphate pesticides (phosmet and parathion) in aqueous solutions. Moreover, in order to meet the need for sensitive and selective chemical detection systems, novel signal processing techniques are employed in the detection process. First, the sensor response is modeled in terms of all relevant contributions (mass loading and viscoelasticity) using a state-space approach. Transient information, often unique to a given analyte/coating pair, is then extracted using nonlinear estimation theory and used to distinguish between chemical species, explain observed sensor responses, and decrease detection time. A detection limit in the ppb range can be achieved from the current experimental measurements.
AB - It has been established that a polymer-coated SH-SAW sensor on 36° rotated Y-cut LiTaO3 is a very sensitive platform for direct liquid-phase chemical sensing. In this work, two partially selective coatings, poly(epichlorohydrin) and Polyurethane are investigated for the detection of organophosphate pesticides (phosmet and parathion) in aqueous solutions. Moreover, in order to meet the need for sensitive and selective chemical detection systems, novel signal processing techniques are employed in the detection process. First, the sensor response is modeled in terms of all relevant contributions (mass loading and viscoelasticity) using a state-space approach. Transient information, often unique to a given analyte/coating pair, is then extracted using nonlinear estimation theory and used to distinguish between chemical species, explain observed sensor responses, and decrease detection time. A detection limit in the ppb range can be achieved from the current experimental measurements.
UR - http://www.scopus.com/inward/record.url?scp=48349130258&partnerID=8YFLogxK
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U2 - 10.1109/ICSENS.2007.4388679
DO - 10.1109/ICSENS.2007.4388679
M3 - Conference contribution
AN - SCOPUS:48349130258
SN - 1424412617
SN - 9781424412617
T3 - Proceedings of IEEE Sensors
SP - 1420
EP - 1423
BT - The 6th IEEE Conference on SENSORS, IEEE SENSORS 2007
T2 - 6th IEEE Conference on SENSORS, IEEE SENSORS 2007
Y2 - 28 October 2007 through 31 October 2007
ER -