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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
Published on: September 23, 2018
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Periodic buckling patterns of graphene/hexagonal boron nitride heterostructure
Chenxi Zhang1, Jizhou Song, Qingda Yang
1Department of Mechanical and Aerospace Engineering, University of Miami, Coral Gables, FL 33146, USA.
Nanotechnology
|October 15, 2014
Summary
Graphene/hexagonal boron nitride (h-BN) heterostructures can buckle. Under compression, the herringbone pattern emerges as the most energetically favorable, offering insights for strain engineering in advanced electronic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Graphene/hexagonal boron nitride (h-BN) heterostructures show promise for enhancing graphene device performance.
- Thermal expansion mismatch between graphene and h-BN can induce buckling in the graphene layer.
Purpose of the Study:
- To investigate periodic buckling patterns in graphene/h-BN heterostructures under equi-biaxial compression.
- To determine the most energetically favorable buckling mode as a function of applied strain.
Main Methods:
- An energy method was employed to analytically derive the total energy for various buckling patterns.
- Cohesive energy, graphene membrane energy, and graphene bending energy were considered in the analysis.
Main Results:
- At critical strain, all investigated buckling patterns (1D, square, hexagonal, triangular, herringbone) exhibit similar total energies.
- At higher compression, the herringbone buckling mode demonstrates the lowest total energy.
- The herringbone mode achieves lower energy by minimizing graphene membrane energy, with minor increases in bending and cohesive energies.
Conclusions:
- The study identifies the herringbone mode as the preferred buckling pattern in graphene/h-BN heterostructures under significant compression.
- These findings provide valuable guidelines for strain engineering applications in graphene-based devices utilizing h-BN substrates.
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