title: Defect-engineered graphene chemical sensors with ultrahigh sensitivity.
abstract: 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.
authors.affiliation: Department of Chemical and Biological Engineering, Korea University, Anam-dong, Sungbuk-gu, Seoul 136-713, Korea. hyunhyun7@korea.ac.kr.
authors.forename: Geonyeop
authors.initials: G
authors.lastname: Lee
authors.affiliation: Department of Chemical and Biological Engineering, Korea University, Anam-dong, Sungbuk-gu, Seoul 136-713, Korea. hyunhyun7@korea.ac.kr.
authors.forename: Gwangseok
authors.initials: G
authors.lastname: Yang
authors.affiliation: Department of Chemical Engineering, University of Seoul, Seoul 130-743, Korea. jwhan@uos.ac.kr.
authors.forename: Ara
authors.initials: A
authors.lastname: Cho
authors.affiliation: Department of Chemical Engineering, University of Seoul, Seoul 130-743, Korea. jwhan@uos.ac.kr.
authors.forename: Jeong Woo
authors.initials: JW
authors.lastname: Han
authors.affiliation: Department of Chemical and Biological Engineering, Korea University, Anam-dong, Sungbuk-gu, Seoul 136-713, Korea. hyunhyun7@korea.ac.kr.
authors.forename: Jihyun
authors.initials: J
authors.lastname: Kim