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http://dx.doi.org/10.46670/JSST.2021.30.2.94

Bimetallic Zeolitic Imidazolate Framework Derived Co3O4/CoFe2O4 Catalyst Loaded In2O3 Nanofibers for Highly Sensitive and Selective Ethanol Sensing  

Lee, Soo-Min (Department of Materials Science and Engineering, Korea University)
Kim, Tae-Hyun (Department of Materials Science and Engineering, Korea University)
Jo, Young-Moo (Department of Materials Science and Engineering, Korea University)
Kim, Ki Beom (Department of Materials Science and Engineering, Korea University)
Lee, Jong-Heun (Department of Materials Science and Engineering, Korea University)
Publication Information
Journal of Sensor Science and Technology / v.30, no.2, 2021 , pp. 94-98 More about this Journal
Abstract
In this study, pure and Co3O4/CoFe2O4-loaded Indium oxide (In2O3) 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%-Co3O4/CoFe2O4-loaded In2O3 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 In2O3 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 Co3O4 and CoFe2O4 in gas sensing reaction and the electronic sensitization induced by the formation of p (Co3O4/CoFe2O4)-n (In2O3) junctions.
Keywords
Zeolitic imidazolate frameworks-$Co_3O_4$-$CoFe_2O_4$-ethanol-gas sensor;
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