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Dual-Peak Friction Upon Traversing a Monolithic Subsurface Step in Layered Materials
Wenjie He1, Honglin Zhang1,2, Junhui Sun1,2,3
1School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, China.
Advanced Materials (Deerfield Beach, Fla.)
|August 3, 2026
Summary
Atomic force microscopy (AFM) revealed a unique dual-peak friction force at step edges in 2D materials. This finding offers insights into friction mechanisms crucial for advanced lubrication systems.
Area of Science:
- Materials Science
- Surface Science
- Tribology
Background:
- Friction at step edges in 2D materials is critical for device performance.
- Conventional models predict a single friction peak over topographic steps.
Purpose of the Study:
- Investigate the anomalous friction behavior at step edges in few-layer 2D materials.
- Elucidate the underlying mechanism of the observed dual-peak friction.
Main Methods:
- High-resolution atomic force microscopy (AFM) measurements.
- Systematic stick-slip measurements and nanoindentation experiments.
- Molecular dynamics (MD) simulations.
Main Results:
- Observed a distinctive anomalous dual-peak friction force at step edges.
- Attributed the bifurcated friction to asynchronous resistive and driving forces.
- Identified transient pinning at both the front and rear of the step.
Conclusions:
- The dual-peak friction mechanism challenges conventional understanding of topographic friction.
- Provides new perspectives for managing step-related friction in 2D material lubrication.
- Essential for understanding the origins of superlubricity in 2D material devices.
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