title: Metal Decoration Effects on the Gas-Sensing Properties of 2D Hybrid-Structures on Flexible Substrates.
abstract: We have investigated the effects of metal decoration on the gas-sensing properties of a device with two-dimensional (2D) molybdenum disulfide (MoS₂) flake channels and graphene electrodes. The 2D hybrid-structure device sensitively detected NO₂ gas molecules (>1.2 ppm) as well as NH₃ (>10 ppm). Metal nanoparticles (NPs) could tune the electronic properties of the 2D graphene/MoS₂ device, increasing sensitivity to a specific gas molecule. For instance, palladium NPs accumulate hole carriers of graphene/MoS₂, electronically sensitizing NH₃ gas molecules. Contrarily, aluminum NPs deplete hole carriers, enhancing NO₂ sensitivity. The synergistic combination of metal NPs and 2D hybrid layers could be also applied to a flexible gas sensor. There was no serious degradation in the sensing performance of metal-decorated MoS₂ flexible devices before/after 5000 bending cycles. Thus, highly sensitive and endurable gas sensor could be achieved through the metal-decorated 2D hybrid-structure, offering a useful route to wearable electronic sensing platforms.
authors.affiliation: Advanced Functional Thin Films Department, Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Sungsan-Gu, Changwon, Gyeongnam 642-831, Korea. bjcho@kims.re.kr.
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, Korea. jwyoon@gist.ac.kr.
authors.forename: Jongwon
authors.initials: J
authors.lastname: Yoon
authors.affiliation: Department of Nanobio Materials and Electronics, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Buk-Gu, Gwangju 500-712, Korea. lsk8410@gist.ac.kr.
authors.forename: Sung Kwan
authors.initials: SK
authors.lastname: Lim
authors.affiliation: Advanced Functional Thin Films Department, Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Sungsan-Gu, Changwon, Gyeongnam 642-831, Korea. kimahra86@kims.re.kr.
authors.forename: Ah Ra
authors.initials: AR
authors.lastname: Kim
authors.affiliation: Advanced Functional Thin Films Department, Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Sungsan-Gu, Changwon, Gyeongnam 642-831, Korea. tjsdud2995@kims.re.kr.
authors.forename: Sun-Young
authors.initials: SY
authors.lastname: Choi
authors.affiliation: Advanced Functional Thin Films Department, Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Sungsan-Gu, Changwon, Gyeongnam 642-831, Korea. dhkim2@kims.re.kr.
authors.forename: Dong-Ho
authors.initials: DH
authors.lastname: Kim
authors.affiliation: Electrochemistry Department, Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Sungsan-Gu, Changwon, Gyeongnam 642-831, Korea. lgh1636@kims.re.kr.
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, Korea. bhl@gist.ac.kr.|Department of Nanobio Materials and Electronics, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Buk-Gu, Gwangju 500-712, Korea. bhl@gist.ac.kr.
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, Korea. heungcho@gist.ac.kr.
authors.forename: Heung Cho
authors.initials: HC
authors.lastname: Ko
authors.affiliation: Advanced Functional Thin Films Department, Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Sungsan-Gu, Changwon, Gyeongnam 642-831, Korea. mghahm@kims.re.kr.
authors.forename: Myung Gwan
authors.initials: MG
authors.lastname: Hahm
keywords: 2D hybrid-structure; MoS2; flexible gas sensor; graphene; metal decoration