skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Waterproof molecular monolayers stabilize 2D materials

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 -C m H 2 m +1 NH 2 , 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: WS 2 , 1T′-MoTe 2 , WTe 2 , WSe 2 , TaS 2 , and NbSe 2 ). 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, H 2 annealing, and organic solvents, but can be removed by certain organic acids.

Authors:
; ; ORCiD logo; ; ; ; ; ; ; ORCiD logo; ; ; ORCiD logo; ; ; ; ORCiD logo;
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1567962
Grant/Contract Number:  
SC0001088
Resource Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 116 Journal Issue: 42; Journal ID: ISSN 0027-8424
Publisher:
Proceedings of the National Academy of Sciences
Country of Publication:
United States
Language:
English

Citation Formats

Su, Cong, Yin, Zongyou, Yan, Qing-Bo, Wang, Zegao, Lin, Hongtao, Sun, Lei, Xu, Wenshuo, Yamada, Tetsuya, Ji, Xiang, Zettsu, Nobuyuki, Teshima, Katsuya, Warner, Jamie H., Dincă, Mircea, Hu, Juejun, Dong, Mingdong, Su, Gang, Kong, Jing, and Li, Ju. Waterproof molecular monolayers stabilize 2D materials. United States: N. p., 2019. Web. doi:10.1073/pnas.1909500116.
Su, Cong, Yin, Zongyou, Yan, Qing-Bo, Wang, Zegao, Lin, Hongtao, Sun, Lei, Xu, Wenshuo, Yamada, Tetsuya, Ji, Xiang, Zettsu, Nobuyuki, Teshima, Katsuya, Warner, Jamie H., Dincă, Mircea, Hu, Juejun, Dong, Mingdong, Su, Gang, Kong, Jing, & Li, Ju. Waterproof molecular monolayers stabilize 2D materials. United States. doi:10.1073/pnas.1909500116.
Su, Cong, Yin, Zongyou, Yan, Qing-Bo, Wang, Zegao, Lin, Hongtao, Sun, Lei, Xu, Wenshuo, Yamada, Tetsuya, Ji, Xiang, Zettsu, Nobuyuki, Teshima, Katsuya, Warner, Jamie H., Dincă, Mircea, Hu, Juejun, Dong, Mingdong, Su, Gang, Kong, Jing, and Li, Ju. Tue . "Waterproof molecular monolayers stabilize 2D materials". United States. doi:10.1073/pnas.1909500116.
@article{osti_1567962,
title = {Waterproof molecular monolayers stabilize 2D materials},
author = {Su, Cong and Yin, Zongyou and Yan, Qing-Bo and Wang, Zegao and Lin, Hongtao and Sun, Lei and Xu, Wenshuo and Yamada, Tetsuya and Ji, Xiang and Zettsu, Nobuyuki and Teshima, Katsuya and Warner, Jamie H. and Dincă, Mircea and Hu, Juejun and Dong, Mingdong and Su, Gang and Kong, Jing and Li, Ju},
abstractNote = {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 -C m H 2 m +1 NH 2 , 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: WS 2 , 1T′-MoTe 2 , WTe 2 , WSe 2 , TaS 2 , and NbSe 2 ). 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, H 2 annealing, and organic solvents, but can be removed by certain organic acids.},
doi = {10.1073/pnas.1909500116},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 42,
volume = 116,
place = {United States},
year = {2019},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1073/pnas.1909500116

Save / Share:

Works referenced in this record:

Generalized Gradient Approximation Made Simple
journal, October 1996

  • Perdew, John P.; Burke, Kieron; Ernzerhof, Matthias
  • Physical Review Letters, Vol. 77, Issue 18, p. 3865-3868
  • DOI: 10.1103/PhysRevLett.77.3865

Van der Waals heterostructures
journal, July 2013

  • Geim, A. K.; Grigorieva, I. V.
  • Nature, Vol. 499, Issue 7459, p. 419-425
  • DOI: 10.1038/nature12385

Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set
journal, October 1996


From ultrasoft pseudopotentials to the projector augmented-wave method
journal, January 1999


Atomically Thin MoS2 A New Direct-Gap Semiconductor
journal, September 2010