Design of a highly sensitive and selective C 2H 5OH sensor using p-type Co 3O 4 nanofibers

Ji Wook Yoon, Joong Ki Choi, Jong Heun Lee

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140 Citations (Scopus)


The Co 3O 4 nanofibers were prepared by electrospinning and their gas sensing characteristics were investigated. The Co 3O 4 sensors prepared by heat treatment of as-spun precursor fibers at 500 and 600 °C showed well-developed one-dimensional morphologies and exhibited high responses to 100 ppm C 2H 5OH (R g/R a = 51.2 and 45.3; R g, resistance in gas; R a, resistance in air) at 301 °C with negligible cross-responses to 100 ppm CO, C 3H 8, and H 2 (R g/R a = 1.02-2.7). In contrast, the most of one-dimensional morphology of the Co 3O 4 specimen was lost and the response to 100 ppm C 2H 5OH became significantly lower when the heat treatment temperature was increased to 700 °C or when the nanofibers were ultrasonically disintegrated into primary particles. The significant decrease of the gas response was explained and discussed in relation to the gas sensing mechanism of a p-type semiconductor, the morphology of specimens, and the connecting configuration between nanoparticles and nanofibers.

Original languageEnglish
Pages (from-to)570-577
Number of pages8
JournalSensors and Actuators, B: Chemical
Issue number1
Publication statusPublished - 2012 Jan 3

Bibliographical note

Funding Information:
This work was supported by KOSEF NRL program grant funded by the Korean Government (MEST) (No. R0A-2008-000-20032-0 ) and the Fundamental R&D program for Core Technology of Materials ( M2008010013 ) funded by Ministry of Knowledge Economy .


  • Co O nanofibers
  • Electrospinning
  • Gas sensing mechanism
  • Gas sensor
  • p-type

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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