Elastic straining of free-standing monolayer graphene

Ke Cao, Shizhe Feng, Ying Han, Libo Gao, Thuc Hue Ly, Zhiping Xu () and Yang Lu ()
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Ke Cao: City University of Hong Kong
Shizhe Feng: Tsinghua University
Ying Han: City University of Hong Kong
Libo Gao: City University of Hong Kong
Thuc Hue Ly: City University of Hong Kong
Zhiping Xu: Tsinghua University
Yang Lu: City University of Hong Kong

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract 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.

Date: 2020
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DOI: 10.1038/s41467-019-14130-0

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