Determining the interlayer shearing in twisted bilayer MoS2 by nanoindentation

Yufei Sun, Yujia Wang, Enze Wang, Bolun Wang, Hengyi Zhao, Yongpan Zeng, Qinghua Zhang, Yonghuang Wu, Lin Gu, Xiaoyan Li () and Kai Liu ()
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Yufei Sun: Tsinghua University
Yujia Wang: Tsinghua University
Enze Wang: Tsinghua University
Bolun Wang: Tsinghua University
Hengyi Zhao: Tsinghua University
Yongpan Zeng: Tsinghua University
Qinghua Zhang: Institute of Physics, Chinese Academy of Sciences
Yonghuang Wu: Tsinghua University
Lin Gu: Institute of Physics, Chinese Academy of Sciences
Xiaoyan Li: Tsinghua University
Kai Liu: Tsinghua University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract The rise of twistronics has increased the attention of the community to the twist-angle-dependent properties of two-dimensional van der Waals integrated architectures. Clarification of the relationship between twist angles and interlayer mechanical interactions is important in benefiting the design of two-dimensional twisted structures. However, current mechanical methods have critical limitations in quantitatively probing the twist-angle dependence of two-dimensional interlayer interactions in monolayer limits. Here we report a nanoindentation-based technique and a shearing-boundary model to determine the interlayer mechanical interactions of twisted bilayer MoS2. Both in-plane elastic moduli and interlayer shear stress are found to be independent of the twist angle, which is attributed to the long-range interaction of intermolecular van der Waals forces that homogenously spread over the interfaces of MoS2. Our work provides a universal approach to determining the interlayer shear stress and deepens the understanding of twist-angle-dependent behaviours of two-dimensional layered materials.

Date: 2022
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DOI: 10.1038/s41467-022-31685-7

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