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Updated: Jun 12, 2025

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Published on: July 5, 2019
Interlayer Friction and Adhesion Effects in Penta-PdSe2-Based van der Waals Heterostructures
Guoliang Ru1, Weihong Qi1,2, Shu Sun1
1State Key Laboratory of Solidification Processing and Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an, 710072, China.
Ultralow friction in 2D heterostructures depends on interface adhesion. Greater ionicity differences between materials lead to lower friction, offering design criteria for superlubricity.
Area of Science:
- Materials Science
- Tribology
- Condensed Matter Physics
Background:
- Two-dimensional (2D) heterostructures offer potential for ultralow friction (superlubricity) due to lattice mismatch.
- Understanding the role of interface adhesion in interlayer friction within these systems is crucial but limited.
Purpose of the Study:
- Investigate the relationship between interface adhesion and interlayer friction in 2D heterostructures.
- Identify design principles for achieving stable superlubricity in layered materials.
Main Methods:
- Experimental investigation of graphene/MoS2, graphene/PdSe2, and MoS2/PdSe2 heterostructures.
- Molecular dynamics simulations to validate experimental friction behavior.
- Analysis of interlayer charge transfer and material ionicity.
Main Results:
- Graphene/MoS2 and graphene/PdSe2 interfaces showed ultralow friction (≈10⁻³).
- MoS2/PdSe2 interfaces exhibited higher friction (≈0.02) due to significant interlayer charge transfer and ionicity differences.
- Lower interlayer friction correlated with greater ionicity differences between constituent 2D materials.
Conclusions:
- Interface adhesion and ionicity differences are key factors regulating interlayer friction in 2D heterostructures.
- Material thickness and adhesion strength influence friction performance.
- Findings provide criteria for designing advanced solid lubricants with tunable ultralow friction properties.
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