Graphene-based nitrogen dioxide gas sensors

G. Ko, H. Y. Kim, J. Ahn, Y. M. Park, K. Y. Lee, J. Kim

Research output: Contribution to journalArticlepeer-review

287 Citations (Scopus)


In this study, we demonstrated that graphene could selectively absorb/desorb NOx molecules at room temperature. Chemical doping with NO2 molecules changed the conductivity of the graphene layers, which was quantified by monitoring the current-voltage characteristics at various NO2 gas concentrations. The adsorption rate was found to be more rapid than the desorption rate, which can be attributed to the reaction occurred on the surface of the graphene layer. The sensitivity was 9% when an ambient of 100 ppm NO2 was used. Graphene-based gas sensors showed fast response, good reversibility, selectivity and high sensitivity. Optimization of the sensor design and integration with UV-LEDs and Silicon microelectronics will open the door for the development of nano-sized gas sensors that are extremely sensitive.

Original languageEnglish
Pages (from-to)1002-1004
Number of pages3
JournalCurrent Applied Physics
Issue number4
Publication statusPublished - 2010 Jul


  • Gas sensors
  • Graphene
  • Nitrogen dioxide

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)


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