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다공성 Cr2O3 나노육각기둥을 이용한 C2H5OH 센서
정현묵 ( Hyun Mook Jeong ),이종혼 ( Jong Heun Lee ) 한국센서학회 2012 센서학회지 Vol.21 No.6
Dense Cr-precursor nano-hexaprisms were prepared by heating the Cr-nitrate aqueous solution containing Hexamethylenetetramine and polyvinylpyrrolidone, which were converted into porous Cr2O3 nano-hexaprisms containing nanoparticles by heat treatment of Crprecursors at 600… for 2 h in air atmosphere. At the sensor temperature of 300…, porous Cr2O3 nano-hexaprism showed the high response (Rg/Ra, Rg: resistance in gas, Ra: resistance in air) to 100 ppm C2H5OH (Rg/Ra=69.8) with negligible cross-responses to 100 ppm CO and 5 ppm C6H6. The sensitive and selective detection of C2H5OH in porous Cr2O3 nano-hexaprism were discussed in relation to the morphology of nanostructures.
Pt, Ni, Cr이 도포된 튜브형 SnO2 나노섬유의 합성과 가스 감응특성
김보영 ( Bo Young Kim ),이철순 ( Chul Soon Lee ),박준식 ( Joon Shik Park ),이종혼 ( Jong Heun Lee ) 한국센서학회 2014 센서학회지 Vol.23 No.3
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.