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Updated: Apr 22, 2026
Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
Ultra long-range interactions between large area graphene and silicon.
Seung Ryul Na1, Ji Won Suk, Rodney S Ruoff
1Department of Aerospace Engineering and Engineering Mechanics Research Center for the Mechanics of Solids, Structures and Materials, ‡Department of Mechanical Engineering and The Materials Science and Engineering Program, The University of Texas at Austin , Austin, Texas 78712, United States.
This study reveals that transferring graphene using wet methods to silicon substrates involves unexpected long-range adhesive interactions beyond typical van der Waals forces, impacting material science applications.
Area of Science:
- Materials Science
- Surface Science
- Nanotechnology
Background:
- Wet-transfer of chemical vapor deposition (CVD) grown graphene is standard for substrate integration.
- The fundamental interactions between large-area graphene and substrates remain poorly understood.
Purpose of the Study:
- To quantify adhesion energy and traction-separation relations for wet-transferred CVD graphene on silicon native oxide.
- To elucidate the nature and range of interfacial forces governing graphene-substrate adhesion.
Main Methods:
- Coupling interferometry measurements of graphene-silicon separation with fracture mechanics analysis.
- Determining traction-separation relationships and adhesion energy through experimental measurements.
Main Results:
- Measured adhesion energy of 357 ± 16 mJ/m(2), consistent with van der Waals interactions.
- Deduced traction-separation relation indicates interaction range longer than typical van der Waals forces.
Conclusions:
- While adhesion energy aligns with van der Waals forces, the extended interaction range suggests additional mechanisms are involved.
- Understanding these forces is crucial for optimizing graphene transfer and device fabrication.
