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The Different Sensitive Behaviors of a Hydrogen-Bond Acidic Polymer-Coated SAW Sensor for Chemical Warfare Agents and Their Simulants

TitleThe Different Sensitive Behaviors of a Hydrogen-Bond Acidic Polymer-Coated SAW Sensor for Chemical Warfare Agents and Their Simulants
Publication TypeJournal Article
Year of Publication2015
AuthorsLong Y., Wang Y., Du X., Cheng L., Wu P., Jiang Y.
JournalSensors (Basel)
Volume15
Issue8
Pagination18302-14
Date PublishedJul 28
ISBN Number1424-8220 (Electronic)1424-8220 (Linking)
KeywordsAcids/*chemistry, Acoustics/*instrumentation, chemical sensor, Chemical Warfare Agents/*analysis, Computer Systems, Hydrogen Bonding, hydrogen-bond acidic polymer, Mustard Gas, Organophosphorus Compounds/analysis, Polymers/*chemistry, Sarin/analysis, Saw, Volatilization
Abstract

A linear hydrogen-bond acidic (HBA) linear functionalized polymer (PLF), was deposited onto a bare surface acoustic wave (SAW) device to fabricate a chemical sensor. Real-time responses of the sensor to a series of compounds including sarin (GB), dimethyl methylphosphonate (DMMP), mustard gas (HD), chloroethyl ethyl sulphide (2-CEES), 1,5-dichloropentane (DCP) and some organic solvents were studied. The results show that the sensor is highly sensitive to GB and DMMP, and has low sensitivity to HD and DCP, as expected. However, the sensor possesses an unexpected high sensitivity toward 2-CEES. This good sensing performance can't be solely or mainly attributed to the dipole-dipole interaction since the sensor is not sensitive to some high polarity solvents. We believe the lone pair electrons around the sulphur atom of 2-CEES provide an electron-rich site, which facilitates the formation of hydrogen bonding between PLF and 2-CEES. On the contrary, the electron cloud on the sulphur atom of the HD molecule is offset or depleted by its two neighbouring strong electron-withdrawing groups, hence, hydrogen bonding can hardly be formed.

URLhttps://www.ncbi.nlm.nih.gov/pubmed/26225975

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