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Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
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Many-body van der Waals interactions in multilayer structures studied by atomic force microscopy.

Xiao Wang1, Zepu Kou1, Ruixi Qiao2

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Many-body van der Waals interactions in multilayer materials are experimentally verified. This study confirms non-additive substrate contributions to adhesion, crucial for 2D material applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Van der Waals interactions in multilayer systems were theoretically predicted to exhibit many-body character.
  • Experimental verification has been hindered by the diminishing interaction across intermediate layers.

Purpose of the Study:

  • To experimentally verify the many-body nature of van der Waals interactions.
  • To investigate the substrate contribution to adhesion at the nanoscale using graphene as a model system.

Main Methods:

  • Utilizing atomic force microscopy (AFM) to probe adhesion between a tip and graphene supported on a substrate.
  • Comparing experimental results with pairwise dispersion theory and many-body dispersion theory.

Main Results:

  • Pairwise dispersion theory overestimates substrate contribution to adhesion.
  • Many-body dispersion theory accurately describes the non-additive nature of substrate contributions.
  • The many-body effect was further elucidated by analyzing the energy spectrum of charge density fluctuations.

Conclusions:

  • The study experimentally confirms the many-body character of van der Waals interactions in layered materials.
  • Findings demonstrate the importance of non-additive effects in nanoscale adhesion.
  • This work enables modulation of van der Waals forces on 2D material surfaces for technological applications.