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Measuring the Adhesion of Graphene Flake Networks via Button Shear Tests
Jorge Eduardo Adatti Estévez1,2, Josef Schätz2,3, Jasper Ruhkopf2,4
1Infineon Technologies AG, Am Campeon 6, 85579 Neubiberg, Germany.
ACS Applied Materials & Interfaces
|April 18, 2025
Summary
Graphene flake networks show improved adhesion on silicon dioxide, especially with flat flakes and high defect density. Button shear testing quantifies this adhesion, revealing hexamethyldisilazane enhances bonding by improving network formation.
Area of Science:
- Materials Science
- Nanotechnology
- Microelectronics Engineering
Background:
- Graphene flake dispersions offer facile fabrication for microelectronic applications.
- Understanding mechanical properties like adhesion is crucial for integrating graphene into devices.
- Existing adhesion data for graphene flake networks is limited.
Purpose of the Study:
- To quantitatively measure the adhesion of graphene flake networks on silicon dioxide using button shear testing (BST).
- To investigate the influence of flake structure, defect density, and surface treatments on graphene adhesion.
- To compare the adhesion of graphene flake networks with transferred chemical vapor-deposited (CVD) monolayer graphene.
Main Methods:
- Button shear testing (BST) to apply shear forces and measure delamination.
- Fabrication of graphene flake networks with varying flake characteristics and defect densities.
- Application of hexamethyldisilazane (HMDS) as a surface treatment.
- Complementary analysis using optical microscopy and Raman spectroscopy.
Main Results:
- Adhesion is enhanced by flat flakes, a flat network structure, and high flake defect density.
- Graphene flake networks exhibit stronger adhesion compared to transferred CVD monolayer graphene.
- HMDS treatment improves flake network formation, increasing overall adhesion force.
- BST, combined with microscopy and spectroscopy, reveals flake-type-specific delamination patterns.
Conclusions:
- Button shear testing is established as a reliable quantitative method for assessing graphene dispersion adhesion.
- Interflake junctions play a critical role in the overall adhesion of graphene flake networks.
- Material design and surface treatments can significantly optimize the adhesion of graphene-based materials for microelectronics.
