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.

中文翻译：

---

几纳米厚的多晶MoS ₂膜的弹性特性：无损研究

面向性能增益的纳米结构化为调节对应用和保持性能至关重要的固体物质的机械特性开辟了一条新途径。同时，机械评估已被推低到低于1μm的尺寸。迄今为止，研究悬浮二维材料机械性能的最标准技术是基于纳米压痕实验。在这项工作中，通过微布里渊光散射，我们以简单，无接触，无损的方式确定了几纳米厚的MoS ₂多晶薄膜的机械性能，即杨氏模量和残余应力。结果表明，与块状MoS ₂相比，弹性软化极大，这与样品的形态和残余应力有关。