Monolayer Co3O4 Inverse Opals as Multifunctional Sensors for Volatile Organic Compounds

Chul Soon Lee, Zhengfei Dai, Seong Yong Jeong, Chang Hoon Kwak, Bo Young Kim, Do Hong Kim, Ho Won Jang, Joon Shik Park, Jong Heun Lee

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


Monolayers of periodic porous Co3O4 inverse opal (IO) thin films for gas-sensor applications were prepared by transferring cobalt-solution-dipped polystyrene (PS) monolayers onto sensor substrates and subsequent removal of the PS template by heat treatment. Monolayer Co3O4 IO thin films having periodic pores (d≈500 nm) showed a high response of 112.9 to 5 ppm C2H5OH at 200 °C with low cross-responses to other interfering gases. Moreover, the selective detection of xylene and methyl benzenes (xylene+toluene) could be achieved simply by tuning the sensor temperature to 250 and 275 °C, respectively, so that multiple gases can be detected with a single chemiresistor. Unprecedentedly high ethanol response and temperature-modulated control of selectivity with respect to ethanol, xylene, and methyl benzenes were attributed to the highly chemiresistive IO nanoarchitecture and to the tuned catalytic promotion of different gas-sensing reactions, respectively. These well-ordered porous nanostructures could have potential in the field of high-performance gas sensors based on p-type oxide semiconductors.

Original languageEnglish
Pages (from-to)7102-7107
Number of pages6
JournalChemistry - A European Journal
Issue number21
Publication statusPublished - 2016 May 17

Bibliographical note

Publisher Copyright:
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


  • monolayers
  • nanostructures
  • sensors
  • template synthesis
  • thin films

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry


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