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http://dx.doi.org/10.5369/JSST.2013.22.4.302

Fast Responding Gas Sensors Using Sb-Doped SnO2 Nanowire Networks  

Kwak, Chang-Hoon (Department of Materials Science and Engineering, Korea University)
Woo, Hyung-Sik (Department of Materials Science and Engineering, Korea University)
Lee, Jong-Heun (Department of Materials Science and Engineering, Korea University)
Publication Information
Journal of Sensor Science and Technology / v.22, no.4, 2013 , pp. 302-307 More about this Journal
Abstract
The Sb-doped $SnO_2$ nanowire network sensors were prepared by thermal evaporation of the mixtures between tin and antimony powders. Pure $SnO_2$ nanowire networks showed high sensor resistance in air ($99M{\Omega}$), similar gas responses to 4 diffferent gases (5 ppm $C_2H_5OH$, CO, $H_2$, and trimethylamine), and very sluggish recovery speed (90% recovery time > 800 s). In contrast, 2 wt% Sb-doped $SnO_2$ showed the selective detection toward $C_2H_5OH$ and trimethylamine, relatively low resistance ($176k{\Omega}$) for facile measurement, and ultrafast recovery speed (90% recovery times: 6 - 18 s). The change of gas sensing charactersitics by Sb doping was discussed in relation to gas sensing mechanism.
Keywords
Sb-$SnO_2$; Nanowire networks; Gas sensors; Sensor resistance; Recovery speed; Selectivity;
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