C2H5OH sensing characteristics of various Co3O4 nanostructures prepared by solvothermal reaction

Kwon Il Choi, Hae Ryong Kim, Kang Min Kim, Dawei Liu, Guozhong Cao, Jong Heun Lee

Research output: Contribution to journalArticlepeer-review

173 Citations (Scopus)


Various morphologies of Co-containing precursors such as nanorods, nanosheets, and nanocubes were prepared by controlling the solvothermal reaction using cobalt acetate, L(+)-lysine, and oxalic acid, all of which were successfully converted into Co3O4 nanostructures without morphological variation. The gas responses of these Co3O4 nanosheets, nanorods, and nanocubes to 100 ppm C2H5OH at 300 °C were 10.5, 4.7, and 4.5 times higher than those of the Co3O4 agglomerated nanopowders, respectively. In addition, the selectivity to C2H5OH over CO and H2, as well as the response/recovery kinetics, were significantly improved. These enhanced gas-sensing characteristics were attributed to the less agglomerated nanostructures of the sensing materials.

Original languageEnglish
Pages (from-to)183-189
Number of pages7
JournalSensors and Actuators, B: Chemical
Issue number1
Publication statusPublished - 2010 Apr 8


  • CHOH sensor
  • CoO
  • Gas sensors
  • Nanostructures
  • Response/recovery time

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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