Fast Responding Gas Sensors Using Sb-Doped SnO 2 Nanowire Networks

Abstract The Sb-doped SnO 2 nanowire network sensors were prepared by thermal evaporation of the mixtures between tin and antimonypowders. Pure SnO 2 nanowire networks showed high sensor resistance in air (99 M
i), similar gas responses to 4 diffferent gases (5 ppmC 2 H 5 OH, CO, H 2 , and trimethylamine), and very sluggish recovery speed (90% recovery time > 800 s). In contrast, 2 wt% Sb-dopedSnO 2 showed the selective detection toward C 2 H 5 OH and trimethylamine, relatively low resistance (176 k
i) for facile measurement, andultrafast recovery speed (90% recovery times: 6 -18 s). The change of gas sensing charactersitics by Sb doping was discussed in relationto gas sensing mechanism. Keywords : Sb-SnO 2 , Nanowire networks, Gas sensors, Sensor resistance, Recovery speed, Selectivity Šð s® (×d• s
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+ Corresponding author : jongheun@korea.ac.kr(Received : Jul. 7, 2013, Accepted : Jul. 24, 2013)This is an Open Access article distributed under the terms of the Creative CommonsAttribution Non-Commercial License(http://creativecommons.org/licenses/by-nc/3.0)which permits unrestricted non-commercial use, distribution, andreproduction in any medium, provided the original work is properly cited.