Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Highly sensitive xylene sensors using Fe2O3-ZnFe2O4 composite spheres

  • Chan, Jin Fang (Department of Materials Science and Engineering, Korea Unversity) ;
  • Jeon, Jae Kyoung (Department of Materials Science and Engineering, Korea Unversity) ;
  • Moon, Young Kook (Department of Materials Science and Engineering, Korea Unversity) ;
  • Lee, Jong-Heun (Department of Materials Science and Engineering, Korea Unversity)
  • Received : 2021.06.28
  • Accepted : 2021.07.23
  • Published : 2021.07.31
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Abstract

Pure ZnFe2O4 and Fe2O3-ZnFe2O4 hetero-composite spheres were prepared by ultrasonic spray pyrolysis of a solution containing Zn- and Fe-nitrates. Additionally, the sensing characteristics of these spheres in the presence of 5 ppm ethanol, benzene, p-xylene, toluene, and CO (within the temperature range of 275-350 ℃) were investigated. The Fe2O3-ZnFe2O4 hetero-composite sensor with a cation ratio of [Zn]:[Fe]=1:3 exhibited a high response (resistance ratio = 140.2) and selectivity (response to p-xylene/response to ethanol = 3.4) to 5 ppm p-xylene at 300 ℃, whereas the pure ZnFe2O4 sensor showed a comparatively lower gas response and selectivity. The reasons for the superior response and selectivity to p-xylene in Fe2O3-ZnFe2O4 hetero-composite sensor were discussed in relation to the electronic sensitization due to charge transfer at Fe2O3-ZnFe2O4 interface and Fe2O3-induced catalytic promotion of gas sensing reaction. The sensor can be used to monitor harmful volatile organic compounds and indoor air pollutants.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea grants funded by the Korea government (2020R1A2C3008933).

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