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).
References
[1]
Chauhana, S; Chauhanb, S; D’Cruzf, R; Faruqic, S; Singhd, KK; Varmae, S; Singha, M; Karthik, V. Chemical warfare agents. Environ. Toxicol. Pharmacol 2008, 26, 113–122.
[2]
Abu-Qare, AW; Abou-Donia, MB. Sarin: Health effects, metabolism, and methods of analysis. Food Chem. Toxicol 2002, 40, 1327–1333.
[3]
Liu, J; Huang, X; Ye, G; Liu, W; Jiao, Z; Chao, W; Zhou, Z; Yu, Z. H2S detection sensing characteristic of CuO/SnO2 Sensor. Sensors 2003, 3, 110–118.
[4]
Patel, SV; Mlsna, TE; Fruhberger, B; Klaassen, E; Cemalovic, S; Baselt, DR. Chemicapacitive microsensors for volatile organic compound detection. Sens. Actuat. B 2003, 96, 541–553.
[5]
Nieuwenhuizen, MS; Harteveld, JLN. An automated SAW gas sensor testing system. Sens. Actuat. A 1994, 44, 219–229.
[6]
Du, X; Ying, Z; Jiang, Y; Liu, Z; Yang, T; Xie, G. Synthesis and evaluation of a new polysiloxane as SAW sensor coatings for DMMP detection. Sens. Actuat. B 2008, 134, 409–413.
[7]
Wang, Y; Yang, Z; Hou, Z; Xu, D; Wei, L; Kong, ESW; Zhang, Y. Flexible gas sensors with assembled carbon nanotube thin films for DMMP vapor detection. Sens. Actuat. B 2010, 150, 708–714.
[8]
Choi, YH; Yang, M; Hong, SH. H2 sensing characteristics of highly textured Pd-doped SnO2 thin films. Sens. Actuat. B 2008, 134, 117–121.
[9]
Kim, JC; Jun, HK; Huh, JS; Lee, DD. Tin oxide-based methane gas sensor promoted by alumina-supported Pd catalyst. Sens. Actuat. B 1997, 45, 271–277.
[10]
Xu, C; Tamaki, J; Miura, N; Yamazoe, N. Grain size effects on gas sensitivity of porous SnO2-based elements. Sens. Actuat. B 1991, 3, 147–155.
[11]
Oh, SW; Kim, YH; Yoo, DJ; Oh, SM; Park, SJ. Sensing behaviour of semiconducting metal oxides for the detection of organophorus compounds. Sens. Actuat. B 1993, 13–14, 400–403.
[12]
Berger, F; Brunol, E; Planade, R; Chambaudet, A. Detection of DEMP vapors using SnO2-based gas sensors: Understanding of the chemical reactional mechanism. Thin Solid Films 2003, 436, 1–8.
[13]
Brunol, E; Berger, F; Fromm, M; Planade, R. Detection of dimethyl methylphosphonate (DMMP) by tin dioxide-based gas sensor: Response curve and understanding of the reactional mechanism. Sens. Actuat. B 2006, 120, 35–41.
[14]
Tomchenko, AA; Harmer, GP; Marquis, BT. Detection of chemical warfare agents using nanostructured metal oxide sensors. Sens. Actuat. B 2005, 108, 41–55.
[15]
Park, HD; Lee, DD; Lee, WI; Kim, JM; Kim, JM. Sensitivity of SnO2-based thick-film devices to CH3CN. Sens. Mater 1994, 5, 209–220.
[16]
Choi, NJ; Kwak, JH; Lim, YT; Bahn, TH; Yun, KY; Kim, JC; Huh, JS; Lee, DD. Classification of chemical warfare agents using thick film gas sensor array. Sens. Actuat. B 2005, 108, 298–304.
[17]
Lee, WS; Choi, HY; Lee, SC; Lee, SJ; Lee, DD; Huh, JS; Kim, JC. Recoverable SnO2-based sensors promoted with MoO3 and Sb2O3 for the detection of DMMP. Rare Met. Mater. Eng 2006, 35, 155–156.
[18]
Lee, SC; Choi, HY; Lee, SJ; Lee, WS; Huh, JS; Lee, DD; Kim, JC. The development of SnO2-based recoverable gas sensors for the detection of DMMP. Sens. Actuat. B 2009, 137, 239–245.
[19]
Lee, SC; Choi, HY; Lee, SJ; Lee, WS; Huh, JS; Lee, DD; Kim, JC. Novel SnO2-based gas sensors promoted with metal oxides for the detection of dichloromethane. Sens. Actuat. B 2009, 138, 446–452.
[20]
Lee, SC; Choi, HY; Lee, WS; Lee, SJ; Ragupathy, D; Lee, DD; Kim, JC. Improvement of recovery of SnO2-based thick film gas sensors for dimethyl methylphosphonate (DMMP) detection. Sens. Lett 2011, 9, 101–105.
[21]
Lee, WS; Lee, SC; Lee, SJ; Lee, DD; Huh, JS; Jun, HK; Kim, JC. The sensing behavior of SnO2-based thick-film gas sensors at a low concentration of chemical agent simulants. Sens. Actuat. B 2005, 108, 148–153.
