Elastic straining of free-standing monolayer graphene.,Nature Communications

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Elastic straining of free-standing monolayer graphene.
Nature Communications ( IF 14.7 ) Pub Date : 2020-01-15 , DOI: 10.1038/s41467-019-14130-0
Ke Cao ₁ , Shizhe Feng ₂ , Ying Han ₁ , Libo Gao _{1,

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4} , Thuc Hue Ly ₅ , Zhiping Xu ₂ , Yang Lu _{1,

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Affiliation

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.

中文翻译：

独立式单层石墨烯的弹性应变。

石墨烯的 sp2 性质赋予六方晶格非常高的理论刚度、强度和弹性，所有这些都有据可查。然而，由于实验设计的困难，石墨烯的极限拉伸性尚未得到证实。在这里，在制定样品转移、成型和应变方案后，直接在扫描电子显微镜中进行原位拉伸测试，报告了通过化学气相沉积生长的独立式单晶单层石墨烯的弹性性能和拉伸性。测量的杨氏模量接近 1 TPa，与理论值吻合良好，而代表性工程拉伸强度达到约 50-60 GPa，样品范围内的弹性应变高达约 6%。我们的研究结果表明，即使在有边缘缺陷的大面积区域中，单晶单层石墨烯确实可以表现出接近理想的机械性能，以及弹性和机械鲁棒性，从而实现灵活的电子和机电一体化应用。

更新日期：2020-01-15

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