Universität zu Köln

Konstantynovski, K., Njio, G., Boerner, F., Lepcha, A., Fischer, T., Holl, G. and Mathur, S. (2018). Bulk detection of explosives and development of customized metal oxide semiconductor gas sensors for the identification of energetic materials. Sens. Actuator B-Chem., 258. S. 1252 - 1267. LAUSANNE: ELSEVIER SCIENCE SA. ISSN 0925-4005

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Abstract

Based on previous work, a setup allowing discrimination between energetic and non-energetic materials was developed. In order to cover novel materials not yet included in databases, a library free approach was chosen. The evaluation of explosion hazards for solid and liquid samples in the lowest milligram range was carried out by relying on the response of the substances towards thermal activation rather than on their chemical nature. The reaction was monitored by a combination of metal oxide semiconductor (MOX) gas sensors, photodiodes and a pressure sensor. Utilization of ambient air as a carrier gas and indirect control over sample weight by the geometry of the heater allow uncomplicated handling under real working conditions. In the first phase readily available physical and chemical sensors were applied. The rate of correct assignments was 99.8% with no false negatives and only 1 false positive out of 475 experiments. The possibility of library free operation was also confirmed by an additional series of experiments on materials not used for training the system. In the second phase the readily available MOX gas sensors were replaced by custom designed ones, which allowed single substances and classes of energetic materials by means to be discriminated by means of principal component analysis (PCA). (C) 2017 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Konstantynovski, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Njio, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Boerner, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lepcha, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fischer, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Holl, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-190228
DOI:	10.1016/j.snb.2017.11.116
Journal or Publication Title:	Sens. Actuator B-Chem.
Volume:	258
Page Range:	S. 1252 - 1267
Date:	2018
Publisher:	ELSEVIER SCIENCE SA
Place of Publication:	LAUSANNE
ISSN:	0925-4005
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19022