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Pure and V-doped NiO porous structures were prepared by the evaporation-induced surfactant assembly and subsequent pyrolysis of assembled structures, and their gas sensing characteristics were investigated. Pure NiO porous structures showed negligible gas responses (S=Rg/Ra, Rg: sensor resistance in analytic gas; Ra: sensor resistance in air) to 5 ppm trimethylamine (S=1.17) as well as other interfering gases such as ethanol, p-xylene, toluene, benzene and formaldehyde (S=1.02-1.13). In contrast, the V-doped NiO porous structures exhibited a high response and selectivity to 5 ppm trimethylamine (S=14.5) with low cross-responses to other interfering gases (S=4.0-8.7) at 350oC. The high gas response of V-doped NiO porous structures to trimethylamine was explained by electronic sensitization, that is, the increase in the chemoresistive variation due to the decrease in the hole concentration. The enhanced selectivity to trimethylamine was discussed in relation to the interaction between basic trimethylamine gas and acidic V catalysts.
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참고문헌 (16)
참고문헌 신청
J. -H. Lee / 2009 / Gas sensors using hierarchical and hollow oxide nanostructures : Overview / Sens. Actuators B 140(1):319~336
T. S. Tee / 2016 / Microwave-assisted hydrolysis preparation of highly crystalline ZnO nanorod array for room temperature photoluminescence-based CO gas sensor / Sens. Actuators B 227:304~312
J. Guo / 2016 / Au nanoparticlefunctionalized 3D SnO2 microstructures for high performance gas sensor / Sens. Actuators B 226:266~272
T. Waitz / 2009 / Ordered mesoporous In2O3 : Synthesis by structure replication and application as a methane gas sensor / Adv. Funct. Mater 19:653~661
H. -J. Kim / 2014 / Highly sensitive and selective gas sensors using p-type oxide semiconductors : Overview / Sens. Actuators B 192:607~627
T. S. Tee / 2016 / Microwave-assisted hydrolysis preparation of highly crystalline ZnO nanorod array for room temperature photoluminescence-based CO gas sensor / Sens. Actuators B 227:304~312
J. Guo / 2016 / Au nanoparticlefunctionalized 3D SnO2 microstructures for high performance gas sensor / Sens. Actuators B 226:266~272
T. Waitz / 2009 / Ordered mesoporous In2O3 : Synthesis by structure replication and application as a methane gas sensor / Adv. Funct. Mater 19:653~661
H. -J. Kim / 2014 / Highly sensitive and selective gas sensors using p-type oxide semiconductors : Overview / Sens. Actuators B 192:607~627
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