Raman spectra evidence for the covalent-like quasi-bonding between exfoliated MoS2 and Au films

作     者：Xinyu HUANG Lei ZHANG Liwei LIU Yang QIN Qiang FU Qiong WU Rong YANG Jun-Peng LV Zhenhua NI Lei LIU Wei JI Yeliang WANG Xingjiang ZHOU Yuan HUANG Xinyu HUANG;Lei ZHANG;Liwei LIU;Yang QIN;Qiang FU;Qiong WU;Rong YANG;Jun-Peng LV;Zhenhua NI;Lei LIU;Wei JI;Yeliang WANG;Xingjiang ZHOU;Yuan HUANG

作者机构：Institute of Physics Chinese Academy of Sciences Department of Materials Science and Engineering College of Engineering Peking University College of Materials Science and Engineering Key Laboratory of Advanced Functional MaterialsMinistry of Education of China Beijing University of Technology School of Information and Electronics MIIT Key Laboratory for Low-Dimensional Quantum Structure and DevicesBeijing Institute of Technology Songshan Lake Materials Laboratory School of Science Beijing University of Posts and Telecommunications School of Physics Southeast University Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-Nano DevicesRenmin University of China 

出 版 物：《Science China(Information Sciences)》 (中国科学:信息科学(英文版))

年 卷 期：2021年第64卷第4期

页      面：157-165页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 070302[理学-分析化学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：supported by National Key Research and Development Program of China (Grant Nos. 2019YFA0308000, 2018YFA0704201, 2019YFA0307801) National Natural Science Foundation of China (Grants Nos. 11874405, 62022089, 61971035, 61725107, 11974001, U1932153) Youth Innovation Promotion Association of CAS (Grants No. 2019007) Beijing Natural Science Foundation (Grants Nos. 2192022, Z190011) Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB33000000) 

主　　题：MoS$_{2}$ Raman spectroscopy gold-enhanced mechanical exfoliation low-frequency raman modes covalent-like quasi-bonding 

摘      要：Gold-enhanced mechanical exfoliation method attracts broad interests in recent years, which has been widely used for preparing large-area and high-quality 2D single crystals. Even many calculations predict that there is strong interaction between Au film and the exfoliated 2D crystals, direct experimental evidence is still lacking. Here, we perform Raman spectroscopy measurements for few layer MoSwith and without Au film underneath. The main peaks of MoSon Au film show no obvious change at higher frequency,however, the breathing and shear modes at low-frequency are suppressed, especially for breathing *** contrast, both breathing modes and shear modes can be detected on suspended MoSand the samples are transferred from Au film to SiO/Si. These comparison results provide direct evidence for the existence of covalent-like quasi-bonding at the interface of Au film and the exfoliated MoScrystal. This MoS/Au interface interaction presents a special pinning-effect for low-frequency rigid vibration. Similar pinning-effect is also discovered in WS/Au system. Our work reports the suppression of low-frequency Raman modes of MoS, WSon Au film, which will deliver new inspiration for studying other interactions between layered materials and solid surfaces.