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http://dx.doi.org/10.5369/JSST.2014.23.3.211

Preparation of Pt-, Ni- and Cr-Decorated SnO2 Tubular Nanofibers and Their Gas Sensing Properties  

Kim, Bo-Young (Department of Materials Science and Engineering, Korea University)
Lee, Chul-Soon (Department of Materials Science and Engineering, Korea University)
Park, Joon-Shik (Smart Convergence Sensor Research Center, Korea Electronics Technology Institute)
Lee, Jong-Heun (Department of Materials Science and Engineering, Korea University)
Publication Information
Journal of Sensor Science and Technology / v.23, no.3, 2014 , pp. 211-215 More about this Journal
Abstract
The Pt-, Ni- and Cr-decorated tubular $SnO_2$ nanofibers for gas sensors were prepared by the electrospinning of polyvinylpyrrolidone (PVP) nanofibers containing Pt, Ni, and Cr precursors, the sputtering of $SnO_2$ on the electrospun PVP nanofibers, and the removal of sacrificial PVP parts by heat treatment at $600^{\circ}C$ for 2 h. Pt-decorated tubular $SnO_2$ nanofibers showed high response ($R_a/R_g=210.5$, $R_g$: resistance in gas, $R_a$: resistance in air) to 5 ppm $C_2H_5OH$ at $350^{\circ}C$ with negligible cross-responses to other interference gases (5 ppm trimethylamine, $NH_3$, HCHO, p-xylene, toluene and benzene). Cr-decorated tubular $SnO_2$nanofibers showed the selective detection of p-xylene at $400^{\circ}C$. In contrast, no significant selectivity to a specific gas was found in Ni-decorated tubular $SnO_2$ nanofibers. The selective and sensitive detection of gases using Pt-decorated and Cr-decorated tubular $SnO_2$ nanofibers were discussed in relation to the catalytic promotion of gas sensing reaction.
Keywords
$SnO_2$ nanofiber; $C_2H_5OH$ sensor; Xylene sensor; Electrospinning; Catalyst; Selectivity;
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