title: Ultrafast Interfacial Self-Assembly of 2D Transition Metal Dichalcogenides Monolayer Films and Their Vertical and In-Plane Heterostructures.
abstract: Cost effective scalable method for uniform film formation is highly demanded for the emerging applications of 2D transition metal dichalcogenides (TMDs). We demonstrate a reliable and fast interfacial self-assembly of TMD thin films and their heterostructures. Large-area 2D TMD monolayer films are assembled at air-water interface in a few minutes by simple addition of ethyl acetate (EA) onto dilute aqueous dispersions of TMDs. Assembled TMD films can be directly transferred onto arbitrary nonplanar and flexible substrates. Precise thickness controllability of TMD thin films, which is essential for thickness-dependent applications, can be readily obtained by the number of film stacking. Most importantly, complex structures such as laterally assembled 2D heterostructures of TMDs can be assembled from mixture solution dispersions of two or more different TMDs. This unusually fast interfacial self-assembly could open up a novel applications of 2D TMD materials with precise tunability of layer number and film structures.
authors.affiliation: National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST , Daejeon 34141, Republic of Korea.
authors.forename: Taeyeong
authors.initials: T
authors.lastname: Yun
authors.affiliation: Department of Chemical and Biomolecular Engineering, KAIST , Daejeon 34141, Republic of Korea.
authors.forename: Jong-Seon
authors.initials: JS
authors.lastname: Kim
authors.affiliation: AMOREPACIFIC Co. R&D Center , Yongin, 446-729, Republic of Korea.
authors.forename: Jongwon
authors.initials: J
authors.lastname: Shim
authors.affiliation: National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST , Daejeon 34141, Republic of Korea.
authors.forename: Dong Sung
authors.initials: DS
authors.lastname: Choi
authors.affiliation: National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST , Daejeon 34141, Republic of Korea.
authors.forename: Kyung Eun
authors.initials: KE
authors.lastname: Lee
authors.affiliation: National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST , Daejeon 34141, Republic of Korea.
authors.forename: Sung Hwan
authors.initials: SH
authors.lastname: Koo
authors.affiliation: National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST , Daejeon 34141, Republic of Korea.
authors.forename: InHo
authors.initials: I
authors.lastname: Kim
authors.affiliation: National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST , Daejeon 34141, Republic of Korea.
authors.forename: Hong Ju
authors.initials: HJ
authors.lastname: Jung
authors.affiliation: Department of Chemical and Biomolecular Engineering, KAIST , Daejeon 34141, Republic of Korea.
authors.forename: Hae-Wook
authors.initials: HW
authors.lastname: Yoo
authors.affiliation: Department of Chemical and Biomolecular Engineering, KAIST , Daejeon 34141, Republic of Korea.
authors.forename: Hee-Tae
authors.identifier: http://orcid.org/0000-0002-5727-6732
authors.initials: HT
authors.lastname: Jung
authors.affiliation: National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST , Daejeon 34141, Republic of Korea.
authors.forename: Sang Ouk
authors.identifier: http://orcid.org/0000-0003-1513-6042
authors.initials: SO
authors.lastname: Kim
keywords: assembly; film; interface; sensor; transition metal dichalcogenide