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Korean Carbon Society (한국탄소학회)
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Flexible NO2 gas sensor using multilayer graphene films by chemical vapor deposition

  • Choi, HongKyw (Electronics and Telecommunications Research Institute) ;
  • Jeong, Hu Young (Central Research Facilities and School of Mechanical and Advanced Materials Engineering, Ulsan National Institute of Science and Technology) ;
  • Lee, Dae-Sik (Electronics and Telecommunications Research Institute) ;
  • Choi, Choon-Gi (Electronics and Telecommunications Research Institute) ;
  • Choi, Sung-Yool (Department of Electrical Engineering and Graphene Research Center, Korea Advanced Institute of Science and Technology)
  • Received : 2013.05.31
  • Accepted : 2013.07.12
  • Published : 2013.07.31
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Abstract

We report a highly sensitive $NO_2$ 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 $NO_2$ even at sub-ppm (<200 ppb) levels. It also exhibited a high resistance change of ~6% when it was exposed to 1 ppm $NO_2$ gas at room temperature for 1 min. The exceptionally high sensitivity could be attributed to the large number of $NO_2$ 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 $NO_2$ 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 $NO_2$ gas sensor devices.

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References

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