Probing interlayer shear thermal deformation in atomically-thin van der Waals layered materials

Le Zhang, Han Wang, Xinrong Zong, Yongheng Zhou, Taihong Wang, Lin Wang () and Xiaolong Chen ()
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Le Zhang: Southern University of Science and Technology
Han Wang: Southern University of Science and Technology
Xinrong Zong: Nanjing Tech University (Nanjing Tech)
Yongheng Zhou: Southern University of Science and Technology
Taihong Wang: Southern University of Science and Technology
Lin Wang: Nanjing Tech University (Nanjing Tech)
Xiaolong Chen: Southern University of Science and Technology

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Atomically-thin van der Waals layered materials, with both high in-plane stiffness and bending flexibility, offer a unique platform for thermomechanical engineering. However, the lack of effective characterization techniques hinders the development of this research topic. Here, we develop a direct experimental method and effective theoretical model to study the mechanical, thermal, and interlayer properties of van der Waals materials. This is accomplished by using a carefully designed WSe2-based heterostructure, where monolayer WSe2 serves as an in-situ strain meter. Combining experimental results and theoretical modelling, we are able to resolve the shear deformation and interlayer shear thermal deformation of each individual layer quantitatively in van der Waals materials. Our approach also provides important interlayer coupling information as well as key thermal parameters. The model can be applied to van der Waals materials with different layer numbers and various boundary conditions for both thermally-induced and mechanically-induced deformations.

Date: 2022
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DOI: 10.1038/s41467-022-31682-w

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