二硫化铼的原位高压偏振拉曼光谱  

In-situ high pressure polarized Raman spectroscopy of rhenium disulfide

作　　者：张茂笛 焦陈寅 文婷 李靓 裴胜海 王曾晖 夏娟 Zhang Mao-Di;Jiao Chen-Yin;Wen Ting;Li Jing;Pei Sheng-Hai;Wang Zeng-Hui;Xia Juan(Institute of Fundamental and Frontier Sciences,University of Electronic Science and Technology of China,Chengdu 610054,China)

机构地区：[1]电子科技大学基础与前沿研究院,成都610054

出　　处：《物理学报》2022年第14期54-62,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:62150052,62004026);国家重点研发计划(批准号:2019YFE0120300);四川省科技厅(批准号:2021YJ0517,21CXTD0088)资助的课题.

摘　　要：高压调控是一种能够对材料的结构、电学、光学等物理特性实现高效、连续且可逆变化的实验手段;拉曼光谱则是一种能够对材料的晶相等结构信息实现精准、快速、无损分析的研究方法.本文结合了金刚石对顶砧高压技术和原位偏振拉曼光谱技术,对二硫化铼(ReS_(2))晶体的拉曼振动模式随压强的演变过程进行了深入研究.实验发现ReS_(2)的常压相(1T')在3.04 GPa的压强下转变为一个扭曲1T'相,继而在14.24 GPa压强下发生了Re_(4)原子簇的层内形变,并且在22.08和25.76 GPa分别发生了不同方向的层间无序叠加向有序叠加的转变.这一系列独特的实验现象充分展现了该二维材料的面内各向异性,并证实ReS_(2)晶体的各向异性随压强的增加而变得愈发显著.本文研究表明压强在调节材料性能方面的关键作用,揭示了ReS_(2)晶体在制备各向异性光学器件和光电器件等方面的潜力.Pressure engineering is known as an efficient,continuous and reversible technique capable of tuning material structure,as well as its electrical,optical,and other physical properties.Raman spectroscopy is used to perform efficient and non-destructive analysis of material structure,and is compatible with the application of external tuning fields.In this work,we combine in-situ pressure engineering and polarized Raman spectroscopy to study the pressure-induced evolution of 18 Raman-active modes in ReS_(2) crystal.We find that the ReS_(2) undergoes a structural transformation from 1T'to a distorted-1T'phase at 3.04 GPa,followed by an intralayer deformation of Re_(4) clusters occurring at 14.24 GPa.Interlayer transitions from disordered to ordered stacking in different in-plane directions are observed at 22.08 GPa and 25.76 GPa when the laser is polarized in different directions,which reflects the pressure-enhanced in-plane anisotropy,i.e.the anisotropy of ReS_(2) crystal becomes more prominent under high pressure.Our findings demonstrate the effectiveness of pressure in tuning material properties,and shed light on potential applications of ReS_(2) crystals in anisotropic optical and optoelectronic devices.

关 键 词：高压调控 二硫化铼 拉曼光谱 各向异性 相变 

分 类 号：TQ137.14[化学工程—无机化工] O657.37[理学—分析化学]