Xylene Sensor Using Cr-doped Co3O4 Nanoparticles Prepared by Flame Spray Pyrolysis

Seong Yong Jeong, Young Moo Jo, Yun Chan Kang, Jong Heun Lee

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


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 Cr-doped Co3O4 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 Co3O4 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 Co3O4 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.

Original languageEnglish
Pages (from-to)112-117
Number of pages6
JournalJournal of Sensor Science and Technology
Issue number2
Publication statusPublished - 2020 Mar

Bibliographical note

Publisher Copyright:
© 2020, Korean Sensors Society. All rights reserved.


  • Cr-doped CoO
  • Flame spray pyrolysis
  • Gas sensors
  • Oxide semiconductors
  • Xylene

ASJC Scopus subject areas

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


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