NO2 gas sensor based on hydrogenated graphene

Sungjin Park, Minji Park, Sunghyun Kim, Sum Gyun Yi, Myeongjin Kim, Jangyup Son, Jongin Cha, Jongill Hong, Kyung Hwa Yoo

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We investigated the relationship between defects in graphene and NO2 gas sensitivity of graphene-based gas sensors. Defects were introduced by hydrogen plasma or ultraviolet (UV)/ozone treatment. As the defect concentration increased, the sensitivity was enhanced, and sub-ppb level detection limit was achieved. UV irradiation was used for recovery at room temperature. However, defects generated by ozone treatment, like graphene oxide, were reduced back to graphene by UV irradiation, so the ozone-treated graphene sensor was not stable over time. In contrast, the response of the hydrogenated graphene sensor was very repeatable because defects generated by hydrogenation was stable enough not to be dehydrogenated by UV irradiation. These results demonstrate that the hydrogenated graphene sensor is a highly sensitive and stable NO2 sensor at room temperature.

Original languageEnglish
Article number213102
JournalApplied Physics Letters
Volume111
Issue number21
DOIs
Publication statusPublished - 2017 Nov 20

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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    Park, S., Park, M., Kim, S., Yi, S. G., Kim, M., Son, J., Cha, J., Hong, J., & Yoo, K. H. (2017). NO2 gas sensor based on hydrogenated graphene. Applied Physics Letters, 111(21), [213102]. https://doi.org/10.1063/1.4999263