title: Bifunctional sensing characteristics of chemical vapor deposition synthesized atomic-layered MoS2.
abstract: Two-dimensional (2D) molybdenum disulfide (MoS2) atomic layers have a strong potential to be adopted for 2D electronic components due to extraordinary and novel properties not available in their bulk foams. Unique properties of the MoS2, including quasi-2D crystallinity, ultrahigh surface-to-volume, and a high absorption coefficient, have enabled high-performance sensor applications. However, implementation of only a single-functional sensor presents a limitation for various advanced multifunctional sensor applications within a single device. Here, we demonstrate the charge-transfer-based sensitive (detection of 120 ppb of NO2) and selective gas-sensing capability of the chemical vapor deposition synthesized MoS2 and good photosensing characteristics, including moderate photoresponsivity (∼71 mA/W), reliable photoresponse, and rapid photoswitching (<500 ms). A bifunctional sensor within a single MoS2 device to detect photons and gas molecules in sequence is finally demonstrated, paving a way toward a versatile sensing platform for a futuristic multifunctional sensor.
authors.affiliation: Advanced Functional Thin Films Department, 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.forename: Ah Ra
authors.initials: AR
authors.lastname: Kim
authors.forename: Youngjin
authors.initials: Y
authors.lastname: Park
authors.forename: Jongwon
authors.initials: J
authors.lastname: Yoon
authors.forename: Young-Joo
authors.initials: YJ
authors.lastname: Lee
authors.forename: Sangchul
authors.initials: S
authors.lastname: Lee
authors.forename: Tae Jin
authors.initials: TJ
authors.lastname: Yoo
authors.forename: Chang Goo
authors.initials: CG
authors.lastname: Kang
authors.forename: Byoung Hun
authors.initials: BH
authors.lastname: Lee
authors.forename: Heung Cho
authors.initials: HC
authors.lastname: Ko
authors.forename: Dong-Ho
authors.initials: DH
authors.lastname: Kim
authors.forename: Myung Gwan
authors.initials: MG
authors.lastname: Hahm
keywords: CVD synthesis; MoS2; bifunctional sensor; gas sensor; photodetector