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Superlubricity between MoS 2 Monolayers
Author(s) -
Li He,
Wang Jinhuan,
Gao Song,
Chen Qing,
Peng Lianmao,
Liu Kaihui,
Wei Xianlong
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201701474
Subject(s) - monolayer , materials science , lubricant , dry lubricant , atomic force microscopy , friction coefficient , composite material , molybdenum disulfide , nanotechnology , scanning electron microscope , hexagonal crystal system , crystallography , chemistry
The ultralow friction between atomic layers of hexagonal MoS 2 , an important solid lubricant and additive of lubricating oil, is thought to be responsible for its excellent lubricating performances. However, the quantitative frictional properties between MoS 2 atomic layers have not been directly tested in experiments due to the lack of conventional tools to characterize the frictional properties between 2D atomic layers. Herein, a versatile method for studying the frictional properties between atomic‐layered materials is developed by combining the in situ scanning electron microscope technique with a Si nanowire force sensor, and the friction tests on the sliding between atomic‐layered materials down to monolayers are reported. The friction tests on the sliding between incommensurate MoS 2 monolayers give a friction coefficient of ≈10 −4 in the regime of superlubricity. The results provide the first direct experimental evidence for superlubricity between MoS 2 atomic layers and open a new route to investigate frictional properties of broad 2D materials.