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Elastic Properties of Few Nanometers Thick Polycrystalline MoS2 Membranes: A Nondestructive Study. 2017

B Graczykowski, and M Sledzinska, and M Placidi, and D Saleta Reig, and M Kasprzak, and F Alzina, and C M Sotomayor Torres
Max Planck Institute for Polymer Research , Ackermannweg 10, 55128, Mainz, Germany.

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.

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