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Issue 7, 2013
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Detection of explosive markers using zeolite modified gas sensors

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Abstract

Detection of hidden explosive devices is a key priority for security and defence personnel around the globe. Electronic noses, based on metal oxide semiconductors (MOS), are a promising technology for creating inexpensive, portable and sensitive devices for such a purpose. An array of seven MOS gas sensors was fabricated by screen printing, based on WO3 and In2O3 inks. The sensors were tested against six gases, including four explosive markers: nitromethane, DMNB (2,3-dimetheyl-2,3-dinitrobutane), 2-ethylhexanol and ammonia. The gases were successfully detected with good sensitivity and selectivity from the array. Sensitivity was improved by overlaying or admixing the oxides with two zeolites, H-ZSM-5 and TS-1, and each showed improved responses to –NO2 and –OH moieties respectively. Admixtures in particular showed promise, with excellent sensitivity and good stability to humidity. Machine learning techniques were applied to a subset of the data and could accurately classify the gases detected, even when confounding factors were introduced.

Graphical abstract: Detection of explosive markers using zeolite modified gas sensors

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Supplementary files

Article information


Submitted
08 Nov 2012
Accepted
18 Dec 2012
First published
18 Dec 2012

J. Mater. Chem. A, 2013,1, 2613-2620
Article type
Paper

Detection of explosive markers using zeolite modified gas sensors

W. J. Peveler, R. Binions, S. M. V. Hailes and I. P. Parkin, J. Mater. Chem. A, 2013, 1, 2613 DOI: 10.1039/C2TA01027E

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