title: Effects of textural properties on the response of a SnO2-based gas sensor for the detection of chemical warfare agents.
abstract: The sensing behavior of SnO(2)-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 SnO(2) [SnO(2)(C)] and nano-SnO(2) prepared by the precipitation method [SnO(2)(P)] were used to prepare the SnO(2) sensor in this study. In the case of DCM and acetonitrile, the SnO(2)(P) sensor showed higher sensor response as compared with the SnO(2)(C) sensors. In the case of DMMP and DPGME, however, the SnO(2)(C) sensor showed higher responses than those of the SnO(2)(P) sensors. In particular, the response of the SnO(2)(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 SnO(2)-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).
authors.affiliation: Department of Chemical Engineering, Kyungpook National University, Daegu 702-701, Korea. soochool@knu.ac.kr
authors.forename: Soo Chool
authors.initials: SC
authors.lastname: Lee
authors.forename: Seong Yeol
authors.initials: SY
authors.lastname: Kim
authors.forename: Woo Suk
authors.initials: WS
authors.lastname: Lee
authors.forename: Suk Yong
authors.initials: SY
authors.lastname: Jung
authors.forename: Byung Wook
authors.initials: BW
authors.lastname: Hwang
authors.forename: Dhanusuraman
authors.initials: D
authors.lastname: Ragupathy
authors.forename: Duk Dong
authors.initials: DD
authors.lastname: Lee
authors.forename: Sang Yeon
authors.initials: SY
authors.lastname: Lee
authors.forename: Jae Chang
authors.initials: JC
authors.lastname: Kim
mesh_terms: D000097:Acetonitriles / Q000032:analysis; D002619:Chemical Warfare Agents / Q000032:analysis*; D008752:Methylene Chloride / Q000032:analysis; D036103:Nanotechnology; D009943:Organophosphorus Compounds / Q000032:analysis; D011409:Propylene Glycols / Q000032:analysis; D017971:Tin Compounds / Q000737:chemistry*
chemical_list: D000097:Acetonitriles; D002619:Chemical Warfare Agents; D009943:Organophosphorus Compounds; D011409:Propylene Glycols; D017971:Tin Compounds; C031116:dimethyl methylphosphonate; C042175:dipropylene glycol monomethyl ether; D008752:Methylene Chloride; C045358:stannic oxide; C032159:acetonitrile