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Sensors 2011, 11(7), 6893-6904; doi:10.3390/s110706893

Effects of Textural Properties on the Response of a SnO2-Based Gas Sensor for the Detection of Chemical Warfare Agents

1
Department of Chemical Engineering, Kyungpook National University, Daegu 702-701, Korea
2
School of Electrical Engineering and Computer Science, Kyungpook National University, Daegu 702-701, Korea
3
Department of Applied Chemistry, Kyungpook National University, Daegu 702-701, Korea
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 2 June 2011 / Revised: 29 June 2011 / Accepted: 30 June 2011 / Published: 1 July 2011
(This article belongs to the Section Chemical Sensors)
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Abstract

The sensing behavior of SnO2-based thick film gas sensors in a flow system in the presence of a very low concentration (ppb level) of chemical agent simulants such as acetonitrile, dipropylene glycol methyl ether (DPGME), dimethyl methylphosphonate (DMMP), and dichloromethane (DCM) was investigated. Commercial SnO2 [SnO2(C)] and nano-SnO2 prepared by the precipitation method [SnO2(P)] were used to prepare the SnO2 sensor in this study. In the case of DCM and acetonitrile, the SnO2(P) sensor showed higher sensor response as compared with the SnO2(C) sensors. In the case of DMMP and DPGME, however, the SnO2(C) sensor showed higher responses than those of the SnO2(P) sensors. In particular, the response of the SnO2(P) sensor increased as the calcination temperature increased from 400 °C to 800 °C. These results can be explained by the fact that the response of the SnO2-based gas sensor depends on the textural properties of tin oxide and the molecular size of the chemical agent simulant in the detection of the simulant gases (0.1–0.5 ppm). View Full-Text
Keywords: sensor; SnO2; sensor response; chemical agent simulant sensor; SnO2; sensor response; chemical agent simulant
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Lee, S.C.; Kim, S.Y.; Lee, W.S.; Jung, S.Y.; Hwang, B.W.; Ragupathy, D.; Lee, D.D.; Lee, S.Y.; Kim, J.C. Effects of Textural Properties on the Response of a SnO2-Based Gas Sensor for the Detection of Chemical Warfare Agents. Sensors 2011, 11, 6893-6904.

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