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Detection of explosive markers using zeolite modified gas sensors

Peveler, WJ; Binions, R; Hailes, SMV; Parkin, IP; (2013) Detection of explosive markers using zeolite modified gas sensors. JOURNAL OF MATERIALS CHEMISTRY A , 1 (7) 2613 - 2620. 10.1039/c2ta01027e. Green open access

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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.

Type: Article
Title: Detection of explosive markers using zeolite modified gas sensors
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/c2ta01027e
Publisher version: http://dx.doi.org/10.1039/c2ta01027e
Language: English
Additional information: © Royal Society of Chemistry 2013
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Computer Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1393189
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