Bias modulated highly sensitive NO2 gas detection using carbon nanotubes

Jong Hong Lee, Joondong Kim, Hee Won Seo, Jin Won Song, Eung Sug Lee, Mooncheol Won, Chang Soo Han

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


A NO2 gas sensor of carbon nanotubes (CNT) array was fabricated by a dielectrophoretic method. It is the first report of 50 ppb level detection operating at room temperature without a supplementary assistance of a heating system, vacuum environment, metal decoration, or additional film coating. The as-deposited CNTs on Pt electrodes by dropping of a CNT cropped solution provided good contact formation without post contact treatment. The bias voltage modulation improved the sensor performance by controlling the Schottky barrier potential. It is highly sensitive NO2 detection at room temperature, which may benefit to reduce the fabrication steps and cost as well.

Original languageEnglish
Pages (from-to)628-631
Number of pages4
JournalSensors and Actuators, B: Chemical
Issue number2
Publication statusPublished - 2008 Feb 22
Externally publishedYes


  • 50 ppb NO detection
  • Carbon nanotube
  • Dielectrophoretic
  • Room temperature
  • Schottky barrier

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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