title: Chemical Sensing of 2D Graphene/MoS2 Heterostructure device.
abstract: We report the production of a two-dimensional (2D) heterostructured gas sensor. The gas-sensing characteristics of exfoliated molybdenum disulfide (MoS2) connected to interdigitated metal electrodes were investigated. The MoS2 flake-based sensor detected a NO2 concentration as low as 1.2 ppm and exhibited excellent gas-sensing stability. Instead of metal electrodes, patterned graphene was used for charge collection in the MoS2-based sensing devices. An equation based on variable resistance terms was used to describe the sensing mechanism of the graphene/MoS2 device. Furthermore, the gas response characteristics of the heterostructured device on a flexible substrate were retained without serious performance degradation, even under mechanical deformation. This novel sensing structure based on a 2D heterostructure promises to provide a simple route to an essential sensing platform for wearable electronics.
authors.affiliation: †Department of Advanced Functional Thin Films, Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Sungsan-Gu, Changwon, Gyeongnam 642-831, Republic of Korea.
authors.forename: Byungjin
authors.initials: B
authors.lastname: Cho
authors.affiliation: ‡School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Buk-Gu, Gwangju 500-712, Republic of Korea.
authors.forename: Jongwon
authors.initials: J
authors.lastname: Yoon
authors.affiliation: ‡School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Buk-Gu, Gwangju 500-712, Republic of Korea.
authors.forename: Sung Kwan
authors.initials: SK
authors.lastname: Lim
authors.affiliation: †Department of Advanced Functional Thin Films, Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Sungsan-Gu, Changwon, Gyeongnam 642-831, Republic of Korea.
authors.forename: Ah Ra
authors.initials: AR
authors.lastname: Kim
authors.affiliation: †Department of Advanced Functional Thin Films, Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Sungsan-Gu, Changwon, Gyeongnam 642-831, Republic of Korea.
authors.forename: Dong-Ho
authors.initials: DH
authors.lastname: Kim
authors.affiliation: †Department of Advanced Functional Thin Films, Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Sungsan-Gu, Changwon, Gyeongnam 642-831, Republic of Korea.
authors.forename: Sung-Gyu
authors.initials: SG
authors.lastname: Park
authors.affiliation: †Department of Advanced Functional Thin Films, Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Sungsan-Gu, Changwon, Gyeongnam 642-831, Republic of Korea.
authors.forename: Jung-Dae
authors.initials: JD
authors.lastname: Kwon
authors.affiliation: †Department of Advanced Functional Thin Films, Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Sungsan-Gu, Changwon, Gyeongnam 642-831, Republic of Korea.
authors.forename: Young-Joo
authors.initials: YJ
authors.lastname: Lee
authors.affiliation: §Electrochemistry Department, Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Sungsan-Gu, Changwon, Gyeongnam 642-831, Republic of Korea.
authors.forename: Kyu-Hwan
authors.initials: KH
authors.lastname: Lee
authors.affiliation: ‡School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Buk-Gu, Gwangju 500-712, Republic of Korea.
authors.forename: Byoung Hun
authors.initials: BH
authors.lastname: Lee
authors.affiliation: ‡School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Buk-Gu, Gwangju 500-712, Republic of Korea.
authors.forename: Heung Cho
authors.initials: HC
authors.lastname: Ko
authors.affiliation: †Department of Advanced Functional Thin Films, Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Sungsan-Gu, Changwon, Gyeongnam 642-831, Republic of Korea.
authors.forename: Myung Gwan
authors.initials: MG
authors.lastname: Hahm
keywords: MoS2; flexible device; gas sensor; graphene; heterostructure