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Direct Observation of Transition Metal Dichalcogenides in Liquid with Scanning Tunneling Microscopy
Ze Wang1,2, Ji-hao Wang*2, Wei-feng Ge1, Wen-jie Meng2, Jing Zhang2, Qi-yuan Feng1, Yu-bin Hou2, Qing-you Lu*1,2,3,4
1.Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China;2.Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230026, China;3.Hefei Science Center, Chinese Academy of Sciences, Hefei 230031, China;4.Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing 210093, China
Abstract:
We present atomic-resolution images of TiSe2, MoTe2 and TaS2 single crystals in liquid condition using our home-built scanning tunneling microscopy (STM). By facilely cleaving of single crystals in liquid, we were able to keep the fresh surface not oxidized within a few hours. Using the high-stable home-built STM, we have obtained atomic resolution images of TiSe2 accompanied with the single atom defects as well as the triangle defects in solution for the first time. Besides, the superstructure of MoTe2 and hexagonal chargedensity wave domain structure in nearly commensurate phase of TaS2 were also obtained at room temperature (295 K). Our results provide a more efficient method in investigating the lively surface of transition metal dichalcogenides. Besides, the high stable liquid-phase STM will support the further investigations in liquid-phase catalysis or electrochemistry.
Key words:  Scanning tunneling microscopy, Liquid, Defect, Charge-density wave
FundProject:
利用扫描隧道显微镜在溶液中直接观测过渡族金属硫属化合物
王 泽1,2, 王纪浩*2, 葛威锋1, 孟文杰2, 张 晶2, 冯启元1, 侯玉斌2, 陆轻铀*1,2,3,4
1.中国科学技术大学合肥微尺度物质科学国家研究中心,合肥 230026;2.中国科学院强磁场科学中心极端条件凝聚态物理安徽省重点实验室,合肥 230031;3.中国科学院合肥大科学中心,合肥 230031;4.南京大学人工微结构科学与技术协同创新中心,南京 210093
摘要:
本文利用自制的溶液扫描隧道显微镜在溶液环境下直接观测到TiSe2、MoTe2和TaS2样品的原子分辨率图像. 通过将单晶样品在溶液中直接解理,可以保护解理过的新鲜样品表面在几个小时内不会被严重污染. 利用自行搭建的溶液扫描隧道显微镜,首先观察到了TiSe2活泼样品的原子分辨率图像,并观察到了TiSe2表面所特有的点缺陷和三角形缺陷结构. 此外,还观察到了MoTe2的原子分辨率超结构和TaS2表面的电荷密度波结构. 结果表明:在室温、溶液环境下能更高效的研究过渡族金属硫属化合物等活泼样品的表面电子态结构,同样适用于溶液环境下的电催化和电化学研究.
关键词:  扫描隧道显微镜,溶液,缺陷,电荷密度波
DOI:10.1063/1674-0068/31/cjcp1803040
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