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

Sensors

Soo Chool Lee²  Seong Yeol Kim²  Woo Suk Lee²  Suk Yong Jung²  Byung Wook Hwang²  Dhanusuraman Ragupathy²  Duk Dong Lee¹  Sang Yeon Lee³ 

[1] School of Electrical Engineering and Computer Science, Kyungpook National University, Daegu 702-701, Korea; E-Mail:;Department of Chemical Engineering, Kyungpook National University, Daegu 702-701, Korea; E-Mails:;Department of Applied Chemistry, Kyungpook National University, Daegu 702-701, Korea; E-Mail:

关键词: sensor;    SnO₂;    sensor response;    chemical agent simulant;   

DOI  :  10.3390/s110706893

来源: mdpi

【 摘 要 】

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).

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.