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 o 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 2 H 5 OH at 350 o 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 o 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. Received : May. 26, 2014, Revised : May. 29, 2014, Accepted : May. 30, 2014 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/ licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
실험 방법