Highly sensitive xylene sensors using Fe2O3-ZnFe2O4composite spheres

Jin Fang Chan, Jae Kyoung Jeon, Young Kook Moon, Jong Heun Lee

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Pure ZnFe2O4and Fe2O3-ZnFe2O4hetero-composite spheres were prepared by ultrasonic spray pyrolysis of a solution containing Znand 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 275-350oC) were investigated. The Fe2O3-ZnFe2O4hetero-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 300oC, whereas the pure ZnFe2O4sensor showed a comparatively lower gas response and selectivity. The reasons for the superior response and selectivity to p-xylene in Fe2O3-ZnFe2O4hetero-composite sensor were discussed in relation to the electronic sensitization due to charge transfer at Fe2O3-ZnFe2O4interface and Fe2O3-induced catalytic promotion of gas sensing reaction. The sensor can be used to monitor harmful volatile organic compounds and indoor air pollutants.

Original languageEnglish
Pages (from-to)191-195
Number of pages5
JournalJournal of Sensor Science and Technology
Issue number4
Publication statusPublished - 2021 Jul

Bibliographical note

Publisher Copyright:
© 2021 The Authors.


  • FeO-ZnFeO
  • Gas sensors
  • Oxide semiconductors
  • Ultrasonic spray pyrolysis
  • Xylene

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Engineering (miscellaneous)
  • Materials Science (miscellaneous)


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