Zeolitic Imidazolate Framework-7로 합성한 ZnO 나노입자의 Acetone 가스 감응 특성
Acetone Sensing Characteristics of ZnO Nanoparticles Prepared from Zeolitic Imidazolate Framework-7
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초록
Highly uniform and well-dispersed Zeolitic Imidazolate Framework-7 (ZIF-7) particles were prepared by the precipitation of Zn2+ using benzimidazole, which were converted into ZnO nanoparticles by heat treatment at 500 °C for 24 h. The ZIF-7 derived ZnO nanoparticles showed abundant mesopores, high surface area, and good dispersion. The gas sensing characteristics toward 5 ppm ace-tone, ethanol, trimethylamine, ammonia, p-xylene, toluene, benzene, and carbon monoxide and carbon dioxide were investigated at 350– 450 oC. ZIF-7 derived ZnO nanoparticles exhibited high response to 5 ppm acetone (Ra/Rg=57.6; Ra: resistance under exposure to the air, Rg: resistance under exposure to the gas) at 450 oC and negligible cross-responses to other interference gases (trimethylamine, ammonia, p-xylene, toluene, benzene, carbon monoxide, carbon dioxide) and relatively low responses to ethanol. ZIF derived synthesis of metal oxide nanoparticles can be used to design high performance acetone sensors
Abstract
Highly uniform and well-dispersed Zeolitic Imidazolate Framework-7 (ZIF-7) particles were prepared by the precipitation of Zn2+ using benzimidazole, which were converted into ZnO nanoparticles by heat treatment at 500 °C for 24 h. The ZIF-7 derived ZnO nanoparticles showed abundant mesopores, high surface area, and good dispersion. The gas sensing characteristics toward 5 ppm ace-tone, ethanol, trimethylamine, ammonia, p-xylene, toluene, benzene, and carbon monoxide and carbon dioxide were investigated at 350– 450 oC. ZIF-7 derived ZnO nanoparticles exhibited high response to 5 ppm acetone (Ra/Rg=57.6; Ra: resistance under exposure to the air, Rg: resistance under exposure to the gas) at 450 oC and negligible cross-responses to other interference gases (trimethylamine, ammonia, p-xylene, toluene, benzene, carbon monoxide, carbon dioxide) and relatively low responses to ethanol. ZIF derived synthesis of metal oxide nanoparticles can be used to design high performance acetone sensors
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