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Superlubricity between MoS2 Monolayers.

He Li1, Jinhuan Wang2, Song Gao1

  • 1Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing, 100871, China.

Advanced Materials (Deerfield Beach, Fla.)
|May 13, 2017
PubMed
Summary

Researchers developed a new method to measure friction between 2D materials. They found ultralow friction, or superlubricity, between hexagonal molybdenum disulfide (MoS2) atomic layers, confirming its excellent lubricating properties.

Keywords:
2D materialsMoS2friction propertiesin situ electron microscopysuperlubricity

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Area of Science:

  • Materials Science
  • Tribology
  • Nanotechnology

Background:

  • Hexagonal molybdenum disulfide (MoS2) exhibits ultralow friction, crucial for its use as a solid lubricant and in lubricating oils.
  • Direct experimental quantification of friction between MoS2 atomic layers has been challenging due to a lack of suitable characterization tools for 2D materials.

Purpose of the Study:

  • To develop a versatile method for studying frictional properties of atomic-layered materials.
  • To experimentally measure the friction coefficient between MoS2 atomic layers, particularly down to the monolayer scale.

Main Methods:

  • Integration of in situ scanning electron microscopy (SEM) with a silicon (Si) nanowire force sensor.
  • Development of a novel technique to perform friction tests on sliding atomic-layered materials, including monolayers.

Main Results:

  • Demonstrated ultralow friction with a friction coefficient of approximately 10^-4 between incommensurate MoS2 monolayers.
  • Provided the first direct experimental evidence of superlubricity in MoS2 atomic layers.

Conclusions:

  • The developed method enables direct experimental investigation of friction in 2D materials.
  • The findings confirm superlubricity in MoS2, offering insights into its superior lubrication performance and opening avenues for studying other 2D materials.