Embedded piezoresistive microcantilever (EPM) sensors provide a small, simple and robust platform for the detection of many different types of analytes [1–4]. These inexpensive sensors may be deployed in battery-powered handheld units, or interfaced to small, battery-powered radio transmitter-receivers (motes), for deployment in mesh networks of many sensors. Previously, we have demonstrated the use of EPM sensors in the detection of hydrogen fluoride gas , organophosphate nerve agents , volatile organic compounds (VOC’s) [2–4], chlorinated hydrocarbons in water, certain animals  and others [8–10]. Here, we report on the design of EPM sensors functionalized for the detection of chlorine gas, or Cl2. We have constructed EPM sensors using composite materials consisting of a polymer or hydrogel matrix loaded with agents specific for the detection of Cl2 such as Nal. These materials were tested in both controlled laboratory conditions and in outdoor releases. Results are presented for gas exposures ranging from 1000 ppm to 20 ppm.
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We would like to thank the staff at the DOE Nevada Test Site NPTec facility for their excellent level of support and cooperation in these and other tests.
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Porter, T.L., Vail, T., Wooley, A. et al. Sensing Materials for the Detection of Chlorine Gas in Embedded Piezoresistive Microcantilever Sensors. MRS Online Proceedings Library 1190, 1135 (2009). https://doi.org/10.1557/PROC-1190-NN11-35