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High-strength scalable graphene sheets by freezing stretch-induced alignment.
Sijie Wan1,2, Ying Chen3, Shaoli Fang4
1School of Chemistry, Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, China.
Nature Materials
|February 5, 2021
Summary
Researchers developed a method to permanently align graphene sheets using covalent and π-π inter-platelet bridging. This technique significantly enhances the strength and conductivity of graphene, paving the way for practical applications.
Area of Science:
- Materials Science
- Nanotechnology
- Mechanical Engineering
Background:
- Graphene's mechanical properties are often limited by layer misalignment during assembly.
- In-plane stretching can temporarily reduce misalignment, but it reverts upon release.
Purpose of the Study:
- To develop a method for permanently aligning graphene sheets at near-room temperatures.
- To enhance the mechanical strength, electrical conductivity, and shielding efficiency of graphene.
Main Methods:
- Utilizing covalent and π-π inter-platelet bridging to "freeze" stretch-induced alignment.
- Assessing mechanical properties, Young's modulus, electrical conductivity, and shielding efficiency.
Main Results:
- Achieved isotropic in-plane sheet strength of 1.55 GPa.
- Demonstrated high Young's modulus, electrical conductivity, and weight-normalized shielding efficiency.
- Confirmed scalability and compatibility with commercial resins for bonding.
Conclusions:
- The stretch-bridging technique offers a scalable solution for high-strength graphene.
- The enhanced graphene properties show significant potential for practical applications in various fields.
