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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

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Superlubric Graphullerene.

Penghua Ying¹, Oded Hod¹, Michael Urbakh¹

¹Department of Physical Chemistry, School of Chemistry, The Raymond and Beverly Sackler Faculty of Exact Sciences, and The Sackler Center for Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv 6997801, Israel.

|August 19, 2024

Summary

This summary is machine-generated.

Graphullerene (GF) offers a novel platform for creating superlubric interfaces with layered materials. This multicontact design significantly reduces sliding energy barriers, enabling ultrasuperlubricity even under extreme conditions.

Keywords:

density functional theory calculations graphullerene interlayer potentials multicontact registry index sliding energy corrugation structural superlubricity

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Area of Science:

Materials Science
Tribology
Nanotechnology

Background:

Superlubricity, a state of ultra-low friction, is crucial for advanced mechanical systems.
Layered materials like graphene and h-BN are known for their superlubric properties.
Developing robust superlubric interfaces that maintain low friction under various conditions remains a challenge.

Purpose of the Study:

To investigate Graphullerene (GF) as a multicontact platform for superlubric interfaces.
To evaluate the sliding energy corrugation and barriers of GF-based interfaces with layered materials.
To explore the potential of GF for designing ultrasuperlubric systems.

Main Methods:

Computational modeling of Graphullerene (GF) structures and their interactions with layered materials.
Analysis of sliding energy barriers and corrugation using first-principles calculations.
Comparison of GF-based interfaces with established superlubric heterojunctions like graphene/h-BN.

Main Results:

Graphullerene (GF) interfaces exhibit very small and comparable sliding energy corrugation across different layered materials.
Covalent interlinking within GF structures further reduces the sliding energy barrier.
Extended GF supercells demonstrate negligible sliding energy barriers in all directions, outperforming graphene/h-BN.

Conclusions:

Graphullerene (GF) is a promising multicontact platform for constructing highly effective superlubric interfaces.
The unique structure of GF enables ultrasuperlubricity, maintaining low friction under demanding sliding conditions.
This research opens new avenues for designing advanced tribological materials with exceptional friction-reducing capabilities.