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Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets
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In Situ Measurements of Strain Evolution in Graphene/Boron Nitride Heterostructures Using a Non-Destructive Raman
Marc Mezzacappa1,2, Dheyaa Alameri2,3, Brian Thomas1,2
1Department of Aerospace and Mechanical Engineering, Saint Louis University, St. Louis, MO 63103, USA.
Nanomaterials (Basel, Switzerland)
|September 9, 2022
Summary
Engineered 2D materials like graphene and boron nitride heterostructures were studied using Raman spectroscopy to understand strain effects. Single-layer graphene showed a greater Raman shift than heterostructures under strain.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Engineered van der Waals (vdW) 2D materials and heterostructures are crucial for advanced applications.
- Understanding their mechanical properties under strain is essential for device implementation.
Purpose of the Study:
- To investigate the strain evolution of single-layer graphene (SLGr) and few-layered boron nitride/graphene (FLBN/SLGr) heterostructures.
- To develop a systematic approach for in situ strain assessment of 2D materials on flexible substrates.
Main Methods:
- Utilized non-destructive Raman spectroscopy to analyze strain effects.
- Synthesized 2D materials using chemical vapor deposition (CVD) on flexible polyethylene terephthalate (PET) substrates.
- Employed a custom-built mechanical device-jig for in situ strain application and measurement.
Main Results:
- Observed strain evolution in SLGr and FLBN/SLGr heterostructures up to 0.5% strain.
- Found that SLG exhibits a higher Raman shift in the 2D band compared to FLBN/SLGr heterostructures under identical strain conditions.
- Demonstrated the capability for precise in situ strain assessment.
Conclusions:
- Gained a better understanding of strain dissipation in vertical 2D heterostacks.
- The findings can aid in designing interfaces to control lattice structure and electronic properties.
- This study offers a scalable method for assessing strain in various 2D materials for flexible device manufacturing.
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