TY - JOUR
T1 - Waterproof molecular monolayers stabilize 2D materials
AU - Su, Cong
AU - Yin, Zongyou
AU - Yan, Qing Bo
AU - Wang, Zegao
AU - Lin, Hongtao
AU - Sun, Lei
AU - Xu, Wenshuo
AU - Yamada, Tetsuya
AU - Ji, Xiang
AU - Zettsu, Nobuyuki
AU - Teshima, Katsuya
AU - Warner, Jamie H.
AU - Dincă, Mircea
AU - Hu, Juejun
AU - Dong, Mingdong
AU - Su, Gang
AU - Kong, Jing
AU - Li, Ju
PY - 2019
Y1 - 2019
N2 - 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 H2m+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.
AB - 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 H2m+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.
KW - anticorrosion
KW - molecular monolayer stabilizer
KW - multilayer 2D materials
UR - http://www.scopus.com/inward/record.url?scp=85073308320&partnerID=8YFLogxK
U2 - 10.1073/pnas.1909500116
DO - 10.1073/pnas.1909500116
M3 - Journal article
C2 - 31575741
AN - SCOPUS:85073308320
SN - 0027-8424
VL - 116
SP - 20844
EP - 20849
JO - Proceedings of the National Academy of Sciences (PNAS)
JF - Proceedings of the National Academy of Sciences (PNAS)
IS - 42
ER -