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When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
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  11. Layer-dependent Friction On The Surface Of Alternately Stacked Graphene And H-bn

Layer-dependent friction on the surface of alternately stacked graphene and h-BN

Hao Wang1, Lu Chen1, Yunxiao Wang1

  • 1State Key Laboratory of Solidification Processing, Center for Advanced Lubrication and Seal Materials, School of Material Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China. xlfan@nwpu.edu.cn.

Physical Chemistry Chemical Physics : PCCP
|December 5, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

Alternately stacked graphene and hexagonal boron nitride (h-BN) coatings show superior lubrication and anti-wear properties compared to pure graphene. The optimal 6-layer structure (6GBN_G) achieves ultra-low friction on copper substrates.

Area of Science:

  • Materials Science
  • Tribology
  • Nanotechnology

Background:

  • Two-dimensional materials offer potential for advanced lubricating coatings on metal surfaces.
  • Graphene and hexagonal boron nitride (h-BN) are promising candidates due to their unique properties.

Purpose of the Study:

  • Investigate the lubricating performance of alternately stacked graphene and h-BN coatings.
  • Determine the optimal structure for enhanced lubrication and anti-wear properties.
  • Understand the underlying mechanisms of friction reduction.

Main Methods:

  • Molecular dynamics (MD) simulations were employed to study the tribological behavior.
  • Analysis included friction coefficient, layer number effects, and substrate deformation.
  • Differential charge density calculations were used to probe interface interactions.

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Main Results:

  • Alternately stacked graphene/h-BN coatings, particularly with graphene on the surface (mGBN_G), outperform pure graphene in lubrication and wear resistance.
  • The 6GBN_G structure demonstrated optimal performance, achieving a friction coefficient as low as 0.002 under specific load conditions.
  • Friction coefficient variation with layer number is linked to wrinkling, indentation, and substrate deformation.
  • Interface charge transfer due to electronegativity differences enhances van der Waals interactions and mechanical properties.

Conclusions:

  • Alternately stacked graphene and h-BN are highly effective lubricating coatings for metal surfaces.
  • The 6GBN_G configuration provides superior lubrication and anti-wear characteristics.
  • These findings offer critical insights for designing high-performance nanocoatings.