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Waterproof molecular monolayers stabilize 2D materials

Author(s)
Su, Cong; Yin, Zongyou; Yan, QingBo; Wang, Zegao; Lin, Hongtao; Sun, Lei; Xu, Wenshuo; Yamada, Tetsuya; Ji, Xiang; Zettsu, Nobuyuki; Teshima, Katsuya; Warner, Jamie H.; Dinca, Mircea; Hu, Juejun; Dong, Mingdong; Su, Gang; Kong, Jing; Li, Ju; ... Show more Show less
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Abstract
Two-dimensional van der Waals materials have rich and unique functional properties, but many are susceptible to corrosion under ambient conditions. Here we show that linear alkylamines n-CmH2m+1NH2, with m = 4 through 11, are highly effective in protecting the optoelectronic properties of these materials, such as black phosphorus (BP) and transition-metal dichalcogenides (TMDs: WS2, 1T′-MoTe2, WTe2, WSe2, TaS2, and NbSe2). As a representative example, n-hexylamine (m = 6) can be applied in the form of thin molecular monolayers on BP flakes with less than 2-nm thickness and can prolong BP’s lifetime from a few hours to several weeks and even months in ambient environments. Characterizations combined with our theoretical analysis show that the thin monolayers selectively sift out water molecules, forming a drying layer to achieve the passivation of the protected 2D materials. The monolayer coating is also stable in air, H2 annealing, and organic solvents, but can be removed by certain organic acids.
Date issued
2019-10
URI
https://hdl.handle.net/1721.1/126051
Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Research Laboratory of Electronics; Massachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Chemistry; Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Journal
Proceedings of the National Academy of Sciences
Publisher
Proceedings of the National Academy of Sciences
Citation
Su, Cong et al. "Waterproof molecular monolayers stabilize 2D materials." Proceedings of the National Academy of Sciences 116, 42 (October 2019): 20844-20849 © 2019 National Academy of Sciences
Version: Final published version
ISSN
0027-8424
1091-6490

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