Mapping the elastic properties of two-dimensional MoS2 via bimodal atomic force microscopy and finite element simulation

	Mapping the elastic properties of two-dimensional MoS2 via bimodal atomic force microscopy and finite element simulation
	Jiangyu Li; Xue-Feng Yu; Huijuan Zhao; Cun-Fa Gao; Yuhao Li; Chuanbin Yu; Yingye Gan; Peng Jiang; Junxi Yu; Yun Ou
刊名	npj Computational Materials
	2018
文献子类	期刊论文
英文摘要	Elasticity is a fundamental mechanical property of two-dimensional (2D) materials, and is critical for their application as well as for strain engineering. However, the accurate measurement of the elastic modulus of 2D materials remains a challenge, and the conventional suspension method suffers from a number of drawbacks. In this work, we demonstrate a method to map the in-plane Young’s modulus of mono- and bi-layer MoS2 on a substrate with high spatial resolution. Bimodal atomic force microscopy is used to accurately map the effective spring constant between the microscope tip and sample, and a finite element method is developed to quantitatively account for the effect of substrate stiffness on deformation. Using these methods, the in-plane Young’s modulus of monolayer MoS2 can be decoupled from the substrate and determined as 265 ± 13 GPa, broadly consistent with previous reports though with substantially smaller uncertainty. It is also found that the elasticity of mono- and bi-layer MoS2 cannot be differentiated, which is confirmed by the first principles calculations. This method provides a convenient, robust and accurate means to map the in-plane Young’s modulus of 2D materials on a substrate.
URL标识	查看原文
语种	英语
内容类型	期刊论文
源URL	[http://ir.siat.ac.cn:8080/handle/172644/14397]
专题	深圳先进技术研究院_医工所
推荐引用方式 GB/T 7714	Jiangyu Li,Xue-Feng Yu,Huijuan Zhao,et al. Mapping the elastic properties of two-dimensional MoS2 via bimodal atomic force microscopy and finite element simulation[J]. npj Computational Materials,2018.
APA	Jiangyu Li.,Xue-Feng Yu.,Huijuan Zhao.,Cun-Fa Gao.,Yuhao Li.,...&Qian Luo.(2018).Mapping the elastic properties of two-dimensional MoS2 via bimodal atomic force microscopy and finite element simulation.npj Computational Materials.
MLA	Jiangyu Li,et al."Mapping the elastic properties of two-dimensional MoS2 via bimodal atomic force microscopy and finite element simulation".npj Computational Materials (2018).