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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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Publication details

The article was received on 08 Nov 2012, accepted on 18 Dec 2012 and first published on 18 Dec 2012


Article type: Paper
DOI: 10.1039/C2TA01027E
Citation: J. Mater. Chem. A, 2013,1, 2613-2620
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    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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