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화염 분무 열분해법으로 합성된 Cr-Co<sub>3</sub>O<sub>4</sub> 나노입자 자일렌 가스센서
정성용 ( Seong-yong Jeong ),조영무 ( Young-moo Jo ),강윤찬 ( Yun Chan Kang ),이종흔 ( Jong-heun Lee ) 한국센서학회 2020 센서학회지 Vol.29 No.2
Xylene is a hazardous volatile organic compound that should be precisely measured to monitor indoor air quality. However, the selective and sensitive detection of ppm-level xylene using oxide-semiconductor gas sensors remains a challenge. In this study, pure and Crdoped Co<sub>3</sub>O<sub>4</sub> nanoparticles (NPs) were prepared using flame spray pyrolysis, and their gas-sensing characteristics to 5-ppm xylene at 250 °C were investigated. The 4 at% Cr-doped Co<sub>3</sub>O<sub>4</sub> NPs exhibited a high gas response to 5-ppm xylene (resistance ratio to gas and air = 39.1) and negligible cross-responses to other representative and ubiquitous indoor pollutants such as ethanol, benzene, formaldehyde, carbon monoxide, and ammonia. In this paper, the enhancement of the gas response and selectivity of Co<sub>3</sub>O<sub>4</sub> NPs to xylene by Cr doping was discussed in relation to the catalytic promotion of the gas-sensing reaction. This sensor can be used to monitor indoor xylene.
이수민 ( Soo-min Lee ),김태현 ( Tae-hyun Kim ),조영무 ( Young-moo Jo ),김기범 ( Ki Beom Kim ),이종흔 ( Jong-heun Lee ) 한국센서학회 2021 센서학회지 Vol.30 No.2
In this study, pure and Co<sub>3</sub>O<sub>4</sub>/CoFe<sub>2</sub>O<sub>4</sub>-loaded Indium oxide (In<sub>2</sub>O<sub>3</sub>) nanofibers were synthesized by the electrospinning of an Indium/Polyvinylpyrrolidone precursor solution containing cobalt and iron bimetallic zeolitic imidazolate frameworks and subsequent heat treatment. The ethanol, toluene, p-xylene, benzene, carbon monodxide, and hydrogen gas sensing characteristics of the solution were measured at 250-400 ℃. 0.5 at%-Co<sub>3</sub>O<sub>4</sub>/CoFe<sub>2</sub>O<sub>4</sub>-loaded In<sub>2</sub>O<sub>3</sub> nanofibers exhibited extreme response (resistance ratio - 1) to 5 ppm of ethanol (210.5) at 250 ℃ and excellent selectivity over the interfering gases. In contrast, pure In<sub>2</sub>O<sub>3</sub> nanofibers exhibited relatively low responses to all the analyte gases and low selectivity above 250-400 ℃. The superior response and selectivity toward ethanol is explained by the catalytic roles of Co<sub>3</sub>O<sub>4</sub> and CoFe<sub>2</sub>O<sub>4</sub> in gas sensing reaction and the electronic sensitization induced by the formation of p (Co<sub>3</sub>O<sub>4</sub>/CoFe<sub>2</sub>O<sub>4</sub>)-n (In<sub>2</sub>O<sub>3</sub>) junctions.