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Moiré-Tile Manipulation-Induced Friction Switch of Graphene on a Platinum Surface
Zhao Liu1,2, J G Vilhena2,3, Antoine Hinaut2
1Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering, Nankai University, 300350 Tianjin, China.
Nano Letters
|March 14, 2023
Summary
Researchers control superlubricity using moiré patterns in graphene. Varying twist angles and normal forces tune sliding from frictionless to dissipative, offering intrinsic control over friction.
Area of Science:
- Materials Science
- Surface Science
- Tribology
Background:
- Friction control is crucial for technological advancement.
- Two-dimensional materials offer potential for near-frictionless contacts.
- Tuning superlubricity remains a key challenge.
Purpose of the Study:
- To investigate the control of superlubricity using moiré patterning.
- To explore the transition between superlubric and dissipative sliding regimes.
- To understand the role of twist angles and normal force in friction control.
Main Methods:
- Friction force microscopy was employed to measure friction.
- Molecular dynamics simulations were used to model sliding behavior.
- Graphene moirés on a Platinum (111) surface were studied at varying twist angles.
Main Results:
- A transition from superlubric to dissipative sliding was observed with increasing normal force.
- The twist angle of graphene moirés significantly influenced the sliding regime.
- A novel mechanism involving moiré tile manipulation at the superlattice level was identified.
Conclusions:
- Moiré patterning provides a method for tuning superlubricity.
- The observed friction control is intrinsic and reversible.
- This work paves the way for advanced friction management in nanoscale devices.
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