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Flexible NO2 gas sensor using multilayer graphene films by chemical vapor deposition

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2013, 14(3), pp.186-189
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General

최홍주 1 Jeong Hu Young 2 Dae-Sik Lee 1 Choi Choon-Gi 1 최성율 3

1한국전자통신연구원
2울산과학기술대학교
3한국과학기술원

Accredited

ABSTRACT

We report a highly sensitive NO2 gas sensor based on multi-layer graphene (MLG) films synthesized by a chemical vapor deposition method on a microheater-embedded flexible substrate. The MLG could detect low-concentration NO2 even at sub-ppm (<200 ppb) levels. It also exhibited a high resistance change of ~6% when it was exposed to 1 ppm NO2 gas at room temperature for 1 min. The exceptionally high sensitivity could be attributed to the large number of NO2 molecule adsorption sites on the MLG due to its a large surface area and various defect-sites, and to the high mobility of carriers transferred between the MLG films and the adsorbed gas molecules. Although desorption of the NO2 molecules was slow, it could be enhanced by an additional annealing process using an embedded Au microheater. The outstanding mechanical flexibility of the graphene film ensures the stable sensing response of the device under extreme bending stress. Our large-scale and easily reproducible MLG films can provide a proof-of-concept for future flexible NO2 gas sensor devices.

Citation status

This is the result of checking the information with the same ISSN, publication year, volume, and start page between the WoS and the KCI journals. (as of 2023-01-02)

Total Citation Counts(KCI+WOS) (33) This is the number of times that the duplicate count has been removed by comparing the citation list of WoS and KCI.

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This paper was written with support from the National Research Foundation of Korea.