Detection of explosive markers using zeolite modified gas sensors

Peveler, W. J. , Binions, R., Hailes, S. M.V. and Parkin, I. P. (2013) Detection of explosive markers using zeolite modified gas sensors. Journal of Materials Chemistry A, 1(7), pp. 2613-2620. (doi:10.1039/c2ta01027e)

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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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Peveler, Dr William
Authors: Peveler, W. J., Binions, R., Hailes, S. M.V., and Parkin, I. P.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
Journal Name:Journal of Materials Chemistry A
Publisher:Royal Society of Chemistry
ISSN:2050-7488
ISSN (Online):2050-7496
Published Online:18 December 2012
Copyright Holders:Copyright © 2013 The Royal Society of Chemistry
First Published:First published in Journal of Materials Chemistry A 1(7): 2613-2620
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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