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Sensors 2015, 15(8), 18167-18177; doi:10.3390/s150818167

A Micro-Preconcentrator Combined Olfactory Sensing System with a Micromechanical Cantilever Sensor for Detecting 2,4-Dinitrotoluene Gas Vapor

1
Center for BioMicrosystems, Korea Institute of Science and Technology, Seoul 136-791, Korea
2
School of Electrical Engineering, Korea University, Seoul 136-701, Korea
3
Department of Electrical Engineering, Kwangwoon University, Seoul 139-701, Korea
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Academic Editor: Michael Tiemann
Received: 17 June 2015 / Revised: 22 July 2015 / Accepted: 23 July 2015 / Published: 24 July 2015
(This article belongs to the Special Issue Gas Sensors—Designs and Applications)
View Full-Text   |   Download PDF [2827 KB, uploaded 24 July 2015]   |  

Abstract

Preventing unexpected explosive attacks and tracing explosion-related molecules require the development of highly sensitive gas-vapor detection systems. For that purpose, a micromechanical cantilever-based olfactory sensing system including a sample preconcentrator was developed to detect 2,4-dinitrotoluene (2,4-DNT), which is a well-known by-product of the explosive molecule trinitrotoluene (TNT) and exists in concentrations on the order of parts per billion in the atmosphere at room temperature. A peptide receptor (His-Pro-Asn-Phe-Ser-Lys-Tyr-Ile-Leu-His-Gln-Arg) that has high binding affinity for 2,4-DNT was immobilized on the surface of the cantilever sensors to detect 2,4-DNT vapor for highly selective detection. A micro-preconcentrator (µPC) was developed using Tenax-TA adsorbent to produce higher concentrations of 2,4-DNT molecules. The preconcentration was achieved via adsorption and thermal desorption phenomena occurring between target molecules and the adsorbent. The µPC directly integrated with a cantilever sensor and enhanced the sensitivity of the cantilever sensor as a pretreatment tool for the target vapor. The response was rapidly saturated within 5 min and sustained for more than 10 min when the concentrated vapor was introduced. By calculating preconcentration factor values, we verified that the cantilever sensor provides up to an eightfold improvement in sensing performance. View Full-Text
Keywords: DNT; gas sensor; cantilever; micro-preconcentrator DNT; gas sensor; cantilever; micro-preconcentrator
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Chae, M.-S.; Kim, J.; Yoo, Y.K.; Kang, J.Y.; Lee, J.H.; Hwang, K.S. A Micro-Preconcentrator Combined Olfactory Sensing System with a Micromechanical Cantilever Sensor for Detecting 2,4-Dinitrotoluene Gas Vapor. Sensors 2015, 15, 18167-18177.

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