title: Effects of surface and morphological properties of zeolite on impedance spectroscopy-based sensing performance.
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 (CeO(2)) 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.
authors.affiliation: School of Electronic Science and Technology, Key Laboratory of Liaoning for Integrated Circuits Technologies, Dalian University of Technology, Dalian 116024, China. jwzhang@dlut.edu.cn
authors.forename: Jianwei
authors.initials: J
authors.lastname: Zhang
authors.forename: Xiaogan
authors.initials: X
authors.lastname: Li
authors.forename: Jeremy
authors.initials: J
authors.lastname: White
authors.forename: Prabir K
authors.initials: PK
authors.lastname: Dutta