论文标题
单层MOS2与金之间的强相互作用的指纹
Fingerprints of the Strong Interaction between Monolayer MoS2 and Gold
论文作者
论文摘要
近年来，黄金介导的MOS2的去角质引起了极大的兴趣。 MOS2和AU之间的强烈相互作用促进了具有接近统一收益率的厘米大小的单层MOS2的优先产生，并且从基本的角度提供了异质结构系统。然而，关于MOS2-AU相互作用的详细性质及其与MOS2厚度的演变知之甚少。在这里，我们使用拉曼和X射线光电子光谱法确定了这种强相互作用的特定振动和结合能指纹，这表明单层MOS2中的大量应变和电荷转移。近场尖端增强的拉曼光谱揭示了纳米级的MOS2-AU相互作用的异质性，反映了两种材料之间的空间不符合性。远场微拉曼光谱表明，这种相互作用受到基础AU的粗糙度和清洁性的强烈影响。我们的结果阐明了强大的MOS2-AU相互作用的性质，并为MOS2的应变和电荷掺杂工程提供了指导。
Gold-mediated exfoliation of MoS2 has attracted considerable interest in the recent years. A strong interaction between MoS2 and Au facilitates preferential production of centimeter-sized monolayer MoS2 with near-unity yield and provides a heterostructure system noteworthy from a fundamental standpoint. However, little is known about the detailed nature of the MoS2-Au interaction and its evolution with the MoS2 thickness. Here, we identify specific vibrational and binding energy fingerprints of such strong interaction using Raman and X-ray photoelectron spectroscopy, which indicate substantial strain and charge-transfer in monolayer MoS2. Near-field tip-enhanced Raman spectroscopy reveals heterogeneity of the MoS2-Au interaction at the nanoscale, reflecting the spatial non-conformity between the two materials. Far-field micro-Raman spectroscopy shows that this interaction is strongly affected by the roughness and cleanliness of the underlying Au. Our results elucidate the nature of the strong MoS2-Au interaction and provide guidance for strain and charge doping engineering of MoS2.
