Pt, Ni, Cr이 도포된 튜브형 SnO2 나노섬유의 합성과 가스 감응특성
Preparation of Pt-, Ni- and Cr-Decorated SnO2 Tubular Nanofibers and Their Gas Sensing Properties
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The Pt-, Ni- and Cr-decorated tubular SnO2 nanofibers for gas sensors were prepared by the electrospinning of polyvinylpyrrolidone (PVP) nanofibers containing Pt, Ni, and Cr precursors, the sputtering of SnO2 on the electrospun PVP nanofibers, and the removal of sacrificial PVP parts by heat treatment at 600oC for 2 h. Pt-decorated tubular SnO2 nanofibers showed high response (Ra/Rg=210.5, Rg: resistance in gas, Ra: resistance in air) to 5 ppm C2H5OH at 350oC with negligible cross-responses to other interference gases (5 ppm trimethylamine, NH3, HCHO, p-xylene, toluene and benzene). Cr-decorated tubular SnO2 nanofibers showed the selective detection of p-xylene at 400oC. In contrast, no significant selectivity to a specific gas was found in Ni-decorated tubular SnO2 nanofibers. The selective and sensitive detection of gases using Pt-decorated and Cr-decorated tubular SnO2 nanofibers were discussed in relation to the catalytic promotion of gas sensing reaction.
Abstract
The Pt-, Ni- and Cr-decorated tubular SnO2 nanofibers for gas sensors were prepared by the electrospinning of polyvinylpyrrolidone (PVP) nanofibers containing Pt, Ni, and Cr precursors, the sputtering of SnO2 on the electrospun PVP nanofibers, and the removal of sacrificial PVP parts by heat treatment at 600oC for 2 h. Pt-decorated tubular SnO2 nanofibers showed high response (Ra/Rg=210.5, Rg: resistance in gas, Ra: resistance in air) to 5 ppm C2H5OH at 350oC with negligible cross-responses to other interference gases (5 ppm trimethylamine, NH3, HCHO, p-xylene, toluene and benzene). Cr-decorated tubular SnO2 nanofibers showed the selective detection of p-xylene at 400oC. In contrast, no significant selectivity to a specific gas was found in Ni-decorated tubular SnO2 nanofibers. The selective and sensitive detection of gases using Pt-decorated and Cr-decorated tubular SnO2 nanofibers were discussed in relation to the catalytic promotion of gas sensing reaction.
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