Analysis of the Detection of Organophosphate Pesticides in Aqueous Solutions Using Hydrogen-Bond Acidic Coating on SH-SAW Devices

作者：Mensah Brown Arnold K; Mlambo Darlington; Josse Fabien^*; Schneider Susan C

来源：IEEE Sensors Journal, 2012, 12(5): 893-903.

DOI：10.1109/JSEN.2011.2163707

• Groundwater contaminant
• guided shear horizontal surface acoustic wave (SH-SAW)
• hybrid organic/inorganic coating
• liquid-phase detection
• organophosphate pesticides

The work presented in this paper focuses on the synthesis and characterization of a hybrid organic/inorganic chemically sensitive layer for rapid detection and analysis of OPs in aqueous solutions using SH-SAW devices. Coated SH-SAW devices on 36 degrees YX-LiTaO3 and 42.75 degrees YX-Quartz (ST-90 degrees X Quartz), are used to determine the optimum operating conditions for achieving rapid sensor responses with high sensitivity. Three analytes (parathion-methyl, parathion, and paraoxon), having similar molecular mass and volume, are used to evaluate the performance of the hybrid organic/inorganic coating in terms of sensor properties of interest including sensitivity, selectivity, reproducibility. It is shown that the coating has a high degree of partial selectivity and sensitivity towards the analytes. With the present non-optimized chemical sensor, a limit of detection of 60 mu g/L (ppb), 20 mu g/L (ppb) and 100 mu g/L (ppb) is estimated for parathion-methyl, parathion, and paraoxon, respectively, when using a 0.5 mu m-thick BPA-HMTS sensing layer. Concentrations as low as 500 mu g/L (ppb) parathion have been measured. This concentration is significantly much lower than the typical concentrations found on agricultural produce (%26gt;= 10 ppm).

• 出版日期2012-5