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Sensors 2012, 12(10), 13284-13294; doi:10.3390/s121013284
Article

Effects of Surface and Morphological Properties of Zeolite on Impedance Spectroscopy-Based Sensing Performance

1
, 1,* , 2
 and 2,*
1 School of Electronic Science and Technology, Key Laboratory of Liaoning for Integrated Circuits Technologies, Dalian University of Technology, Dalian 116024, China 2 Department of Chemistry, The Ohio State University, 120 W. 18th Avenue, Columbus, OH 43210, USA
* Authors to whom correspondence should be addressed.
Received: 18 July 2012 / Revised: 3 September 2012 / Accepted: 20 September 2012 / Published: 1 October 2012
(This article belongs to the Section Physical Sensors)
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Abstract

Measurement by impedance spectroscopy of the changes in intrazeolitic cation motion of pressed pellets of zeolite particles upon adsorption of dimethylmethylphosphonate (DMMP) provides a strategy for sensing DMMP, a commonly used simulant for highly toxic organophosphate nerve agents. In this work, two strategies for improving the impedance spectroscopy based sensing of DMMP on zeolites were investigated. The first one is the use of cerium oxide (CeO2) coated on the zeolite surface to neutralize acidic groups that may cause the decomposition of DMMP, and results in better sensor recovery. The second strategy was to explore the use of zeolite Y membrane. Compared to pressed pellets, the membranes have connected supercages of much longer length scales. The zeolite membranes resulted in higher sensitivity to DMMP, but recovery of the device was significantly slower as compared to pressed zeolite pellets.
Keywords: chemical warfare agents; zeolite membranes; chemical gas sensors chemical warfare agents; zeolite membranes; chemical gas sensors
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Zhang, J.; Li, X.; White, J.; Dutta, P.K. Effects of Surface and Morphological Properties of Zeolite on Impedance Spectroscopy-Based Sensing Performance. Sensors 2012, 12, 13284-13294.

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