Liquid-phase detection of organophosphate pesticides using guided SH-SAW sensor

A. Mensah-Brown, M. J. Wenzel, F. Josse, E. Yaz, O. Sadik

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations

Abstract

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.

Original languageEnglish (US)
Title of host publicationThe 6th IEEE Conference on SENSORS, IEEE SENSORS 2007
Pages1420-1423
Number of pages4
DOIs
StatePublished - 2007
Externally publishedYes
Event6th IEEE Conference on SENSORS, IEEE SENSORS 2007 - Atlanta, GA, United States
Duration: Oct 28 2007Oct 31 2007

Publication series

NameProceedings of IEEE Sensors

Conference

Conference6th IEEE Conference on SENSORS, IEEE SENSORS 2007
Country/TerritoryUnited States
CityAtlanta, GA
Period10/28/0710/31/07

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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