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Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
Published on: July 18, 2025
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Universal shape and pressure inside bubbles appearing in van der Waals heterostructures
E Khestanova1, F Guinea1,2, L Fumagalli1
1School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK.
Nature Communications
|August 26, 2016
Summary
Bubbles trapped under 2D crystals like graphene reveal insights into material elasticity. These confined bubbles generate significant hydrostatic pressure, potentially altering material properties at the nanoscale.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Bubbles form between two-dimensional (2D) crystals and flat substrates due to trapped substances.
- Bubble characteristics (size, shape, pressure) depend on van der Waals forces and elastic energy.
- These bubbles offer a method to study 2D crystal elasticity and confinement effects.
Purpose of the Study:
- To analyze the characteristics of bubbles formed by 2D crystal monolayers.
- To investigate the relationship between bubble properties and the elastic behavior of 2D materials.
- To measure the hydrostatic pressure within confined bubbles.
Main Methods:
- Utilized atomic force microscopy (AFM) to examine bubbles in graphene, boron nitride, and MoS2 monolayers.
- Applied membrane elasticity theory to analyze bubble shapes and scaling.
- Measured hydrostatic pressure inside submicron bubbles.
Main Results:
- Observed universal scaling in bubble shapes across different 2D materials.
- Measured hydrostatic pressures reaching tens of MPa in submicron bubbles.
- Theoretically estimated pressures approaching 1 GPa in sub-10 nm bubbles.
Conclusions:
- Bubble shape analysis provides a route to study 2D crystal elastic properties.
- Confinement within bubbles induces substantial hydrostatic pressures.
- High pressures in nanoscale bubbles may significantly influence trapped material properties.
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