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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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Buckling Behavior of Substrate Supported Graphene Sheets.
Kuijian Yang1, Yuli Chen2, Fei Pan3
1Institute of Solid Mechanics, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, China. yangkj@buaa.edu.cn.
Materials (Basel, Switzerland)
|August 10, 2017
Summary
This study reveals how graphene sheet size and substrate interactions influence buckling. Graphene sheets on substrates show significantly enhanced buckling resistance compared to free-standing ones.
Area of Science:
- Materials Science
- Nanotechnology
- Solid Mechanics
Background:
- Graphene sheet buckling on substrates degrades performance in nano-electromechanical systems.
- Understanding buckling behavior is crucial for designing reliable graphene-based devices.
Purpose of the Study:
- To systematically investigate the buckling behavior of monolayer graphene sheet/substrate systems.
- To determine the influence of graphene size and substrate interactions on buckling modes and critical stress/strain.
Main Methods:
- Molecular mechanics simulations were performed on 70 cases of simple-supported graphene sheets.
- Theoretical analysis was employed to complement simulation findings.
- Uniaxial compression was applied to graphene sheets of varying dimensions.
Main Results:
- Two distinct buckling modes were identified, primarily governed by graphene sheet dimensions.
- For larger sheets (length > 3 nm, width > 1.1 nm), buckling mode depends on the length/width ratio.
- Graphene substrates increase critical buckling stress and strain by approximately 10 times compared to free-standing sheets.
- For common-sized graphene sheets (length > 20 nm), buckling is independent of size and dictated by substrate adhesion.
Conclusions:
- Graphene sheet size and substrate interactions critically influence buckling behavior.
- Substrate presence significantly enhances buckling resistance, offering design advantages.
- Findings provide essential guidelines for developing graphene materials and nano-electromechanical systems.
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