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Elastic straining of free-standing monolayer graphene
Nature Communications ( IF 11.878 ) Pub Date : 2020-01-15 , DOI: 10.1038/s41467-019-14130-0
Ke Cao; Shizhe Feng; Ying Han; Libo Gao; Thuc Hue Ly; Zhiping Xu; Yang Lu

The sp2 nature of graphene endows the hexagonal lattice with very high theoretical stiffness, strength and resilience, all well-documented. However, the ultimate stretchability of graphene has not yet been demonstrated due to the difficulties in experimental design. Here, directly performing in situ tensile tests in a scanning electron microscope after developing a protocol for sample transfer, shaping and straining, we report the elastic properties and stretchability of free-standing single-crystalline monolayer graphene grown by chemical vapor deposition. The measured Young’s modulus is close to 1 TPa, aligning well with the theoretical value, while the representative engineering tensile strength reaches ~50-60 GPa with sample-wide elastic strain up to ~6%. Our findings demonstrate that single-crystalline monolayer graphene can indeed display near ideal mechanical performance, even in a large area with edge defects, as well as resilience and mechanical robustness that allows for flexible electronics and mechatronics applications.
更新日期:2020-01-15

 

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