Elastic Properties of Few Nanometers Thick Polycrystalline MoS 2 Membranes: A Nondestructive Study

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 techniqu...

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Bibliographic Details
Published in:Nano letters 2017-12, Vol.17 (12), p.7647-7651
Main Authors: Graczykowski, B, Sledzinska, M, Placidi, M, Saleta Reig, D, Kasprzak, M, Alzina, F, Sotomayor Torres, C M
Format: Article
Language:English
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Summary: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 MoS membranes in a simple, contact-less, nondestructive manner. The results show huge elastic softening compared to bulk MoS , which is correlated with the sample morphology and the residual stress.
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.7b03669