State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China.
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China.
J Colloid Interface Sci. 2019 Mar 7;538:159-164. doi: 10.1016/j.jcis.2018.11.032. Epub 2018 Nov 10.
In the present work, properties of the interlayer breathing modes in twisted MoS samples with different structures are carefully examined. The distribution of peak position of the breathing modes is mainly dependent on overall layer numbers, and is only slightly affected by specific structure of the sample. Linear chain model calculation shows quantitatively a markedly decrease in interlayer force on the twisted interface, and slight difference in Raman frequency may mean considerable difference in interlayer force. When one or both of the component layers get too thick, no new breathing modes can be found, indicating that rigidity of the component may affect the coupling efficiency. Our work demonstrates that low-frequency Raman spectroscopy can act as an effective indirect strategy for the detection of interlayer interaction, which is a good complement to existing methods such as AFM technologies.
在本工作中，我们仔细研究了不同结构的扭曲 MoS 样品中层间呼吸模式的性质。呼吸模式峰位置的分布主要取决于总层数，而受样品具体结构的影响很小。线性链模型计算定量地表明，扭曲界面上的层间力明显减小，而拉曼频率的微小差异可能意味着层间力的相当大的差异。当一个或两个组成层变得太厚时，就无法发现新的呼吸模式，这表明组成层的刚性可能会影响耦合效率。我们的工作表明，低频拉曼光谱可以作为检测层间相互作用的有效间接策略，这是对现有方法（如 AFM 技术）的很好补充。
