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Interlayer interaction on twisted interface in incommensurate stacking MoS2: A Raman spectroscopy study

Zhou, Xiang, Jin, Ke, Cong, Xin, Tan, Qinghai, Li, Junyi, Liu, Dameng, Luo, Jianbin
Journal of colloid and interface science 2019 v.538 pp. 159-164
Raman spectroscopy, models, molybdenum disulfide
In the present work, properties of the interlayer breathing modes in twisted MoS2 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.