Defect-engineered graphene chemical sensors with ultrahigh sensitivity

Geonyeop Lee, Gwangseok Yang, Ara Cho, Jeong Woo Han, Jihyun Kim

Research output: Contribution to journalArticlepeer-review

94 Citations (Scopus)


We report defect-engineered graphene chemical sensors with ultrahigh sensitivity (e.g., 33% improvement in NO2 sensing and 614% improvement in NH3 sensing). A conventional reactive ion etching system was used to introduce the defects in a controlled manner. The sensitivity of graphene-based chemical sensors increased with increasing defect density until the vacancy-dominant region was reached. In addition, the mechanism of gas sensing was systematically investigated via experiments and density functional theory calculations, which indicated that the vacancy defect is a major contributing factor to the enhanced sensitivity. This study revealed that defect engineering in graphene has significant potential for fabricating ultra-sensitive graphene chemical sensors.

Original languageEnglish
Pages (from-to)14198-14204
Number of pages7
JournalPhysical Chemistry Chemical Physics
Issue number21
Publication statusPublished - 2016

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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