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in situ Nanomechanical Characterization of Multi-Layer MoS2 Membranes: from Intraplanar to Interplanar Fracture

Abstract

Layered molybdenum disulfide (MoS2) exhibits rich electronic and optical properties which possesses vastly differing characteristic dimensions. Multi-layer MoS2 membrane represents the critical hierarchical structure which bridges the length-scale of monolayer and bulk material architectures. In this study, the in-plane mechanical properties of MoS2 membranes were investigated by in situ SEM tensile testing. Under the uniaxial tensile loading, failure was dominated by brittle fracture in a highly localized region of the MoS2 membranes and their mechanical properties show thickness effect: the strengths of the relatively thicker MoS2 membranes (thickness around hundreds of nanometers) distribute from ~100 and ~250 MPa, while the corresponding values of the MoS2 nanosheets (thickness around tens of nanometers) increase significantly to more than 1GPa. Upon molecular dynamics (MD) simulations on the fractures of MoS2 with various thickness/layers, the thicker MoS2 membranes show interplanar fracture, and typical MoS2 nanosheets demonstrate the transition from interplanar to intraplanar fractures, while monolayer and few-layer MoS2 are dominated by intraplanar fracture. Our study provides some critical insights on the mechanical properties and fracture behavior of layered MoS2 2D materials, which could be of value for their in flexible electronics, optoelectronics and nano-electro-mechanical system (NEMS) applications.

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Publication details

The article was accepted on 24 May 2017 and first published on 02 Jun 2017


Article type: Paper
DOI: 10.1039/C7NR02171B
Citation: Nanoscale, 2017, Accepted Manuscript
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    in situ Nanomechanical Characterization of Multi-Layer MoS2 Membranes: from Intraplanar to Interplanar Fracture

    P. Li, C. Jiang, S. Xu, Y. Zhuang, L. Gao, A. Hu, H. Wang and Y. Lu, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR02171B

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