Bending of Multilayer van der Waals Materials

作     者：Guorui Wang Zhaohe Dai Junkai Xiao ShiZhe Feng Chuanxin Weng Luqi Liu Zhiping Xu Rui Huang Zhong Zhang 

作者机构：CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Hefei 230026 China Department of Aerospace Engineering and Engineering Mechanics The University of Texas at Austin Austin Texas 78712 USA Applied Mechanics Laboratory Department of Engineering Mechanics and Center for Nano and Micro Mechanics Tsinghua University Beijing 100084 China 

出 版 物：《Physical Review Letters》 (物理评论快报)

年 卷 期：2019年第123卷第11期

页      面：116101-116101页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：National Natural Science Foundation of China, NSFC, (11832010, 11890682, 21474023, 21721002) National Natural Science Foundation of China, NSFC Chinese Academy of Sciences, CAS, (XDB30020100) Chinese Academy of Sciences, CAS National Key Research and Development Program of China, NKRDPC, (2013CB934203, 2016YFA0301204) National Key Research and Development Program of China, NKRDPC 

主　　题：Elasticity Mechanical & acoustical properties Mechanical deformation Mechanical properties of membranes Microstructure Surface & interfacial phenomena 2-dimensional systems Graphene Atomic force microscopy Mechanical testing Molecular dynamics Raman spectroscopy 

摘      要：Out-of-plane deformation patterns, such as buckling, wrinkling, scrolling, and folding, formed by multilayer van der Waals materials have recently seen a surge of interest. One crucial parameter governing these deformations is bending rigidity, on which significant controversy still exists despite extensive research for more than a decade. Here, we report direct measurements of bending rigidity of multilayer graphene, molybdenum disulfide (MoS2), and hexagonal boron nitride (hBN) based on pressurized bubbles. By controlling the sample thickness and bubbling deflection, we observe platelike responses of the multilayers and extract both their Young’s modulus and bending rigidity following a nonlinear plate theory. The measured Young’s moduli show good agreement with those reported in the literature (EgrapheneEhBNEMoS2), but the bending rigidity follows an opposite trend, DgrapheneDhBNDMoS2 for multilayers with comparable thickness, in contrast to the classical plate theory, which is attributed to the interlayer shear effect in the van der Waals materials.