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Epitaxial Synthesis of Molybdenum Carbide and Formation of a Mo2C/MoS2 Hybrid Structure via Chemical Conversion of Molybdenum Disulfide

Title
Epitaxial Synthesis of Molybdenum Carbide and Formation of a Mo2C/MoS2 Hybrid Structure via Chemical Conversion of Molybdenum Disulfide
Authors
Jeon, JaehoPark, Ye RuemChoi, SeunghyukLee, Jin HeeLim, Sang KyooLee, Byoung HunSong, Young JaeCho, Jeong HoJang, Yun HeeLee, Sungjoo
DGIST Authors
Lim, Sang KyooJang, Yun Hee
Issue Date
2018-01
Citation
Acs Nano, 12(1), 338-346
Type
Article
Article Type
Article
Keywords
TRANSITION-METAL CARBIDESHYDROGEN EVOLUTION REACTIONMOLECULAR-DYNAMICSSUPERCONDUCTING CRYSTALSCONTACT RESISTANCEALKALINE MEDIAMOS2GRAPHENEMONOLAYERMO2C
ISSN
1936-0851
Abstract
The epitaxial synthesis of molybdenum carbide (Mo2C, a 2D MXene material) via chemical conversion of molybdenum disulfide (MoS2) with thermal annealing under CH4 and H2 is reported. The experimental results show that adjusting the thermal annealing period provides a fully converted metallic Mo2C from MoS2 and an atomically sharp metallic/semiconducting hybrid structure via partial conversion of the semiconducting 2D material. Mo2C/MoS2 hybrid junctions display a low contact resistance (1.2 kω·μm) and low Schottky barrier height (26 meV), indicating the material's potential utility as a critical hybrid structural building block in future device applications. Density functional theory calculations are used to model the mechanisms by which Mo2C grows and forms a Mo2C/MoS2 hybrid structure. The results show that Mo2C conversion is initiated at the MoS2 edge and undergoes sequential hydrodesulfurization and carbide conversion steps, and an atomically sharp interface with MoS2 forms through epitaxial growth of Mo2C. This work provides the area-controllable synthesis of a manufacturable MXene from a transition metal dichalcogenide material and the formation of a metal/semiconductor junction structure. The present results will be of critical importance for future 2D heterojunction structures and functional device applications. © 2018 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/5884
DOI
10.1021/acsnano.7b06417
Publisher
American Chemical Society
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Collection:
Smart Textile Convergence Research Group1. Journal Articles
Department of Energy Science and EngineeringCMMM Lab(Curious Minds Molecular Modeling Laboratory)1. Journal Articles


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