Elastic Properties of Few Nanometers Thick Polycrystalline MoS2 Membranes: A Nondestructive Study

Nano Lett. 2017 Dec 13;17(12):7647-7651. doi: 10.1021/acs.nanolett.7b03669. Epub 2017 Nov 17.

Abstract

The performance gain-oriented nanostructurization has opened a new pathway for tuning mechanical features of solid matter vital for application and maintained performance. Simultaneously, the mechanical evaluation has been pushed down to dimensions way below 1 μm. To date, the most standard technique to study the mechanical properties of suspended 2D materials is based on nanoindentation experiments. In this work, by means of micro-Brillouin light scattering we determine the mechanical properties, that is, Young modulus and residual stress, of polycrystalline few nanometers thick MoS2 membranes in a simple, contact-less, nondestructive manner. The results show huge elastic softening compared to bulk MoS2, which is correlated with the sample morphology and the residual stress.

Keywords: Molybdenum disulfide; elastic properties; micro-Brillouin light scattering; ultrathin membranes.

Publication types

  • Research Support, Non-U.S. Gov't