Grain Boundaries and Tilt-Angle-Dependent Transport Properties of a 2D Mo2C Superconductor

doi:10.1021/acs.nanolett.8b04065

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	Grain Boundaries and Tilt-Angle-Dependent Transport Properties of a 2D Mo2C Superconductor
	Liu, Zhibo 1; Xu, Chuan 1; Wang, Cheng 3; Song, Shuang 3; Wang, Libin 3; Wang, Yujia 1; Kang, Ning 3; Ma, Xiuliang 1,4; Cheng, Hui-Ming 1,2,5; Ren, Wencai 1,2
刊名	Nano Letters
	2019-02-13
卷号	19 期号:2 页码:857-865
关键词	Carbides Dislocations (crystals) Electric variables measurement Grain boundaries Graphene High resolution transmission electron microscopy Layered semiconductors Molybdenum compounds Nanocrystalline materials Scanning electron microscopy Sulfur compounds Superconducting materials Superconductivity Transition metals Transport properties
ISSN号	15306984
DOI	10.1021/acs.nanolett.8b04065
英文摘要	The grain boundaries (GBs) of graphene and molybdenum disulfide have been extensively demonstrated to have a strong influence on electronic, thermal, optical, and mechanical properties. 2D transition-metal carbides (TMCs), known as MXenes, are a rapidly growing new family of 2D materials with many fascinating properties and promising applications. However, the GB structure of 2D TMCs and the influence of GB on their properties remain unknown. Here, we used aberration-corrected scanning transmission electron microscopy combined with electrical measurements to study the GB characteristic of highly crystalline 2D Mo2C superconductor, a newly emerging member of the 2D TMC family. The 2D Mo2C superconductor shows a unique tilt-angle-dependent GB structure and electronic transport properties. Different from the reported 2D materials, the GB of 2D Mo2C shows a peculiar dislocation configuration or sawtooth pattern depending on the tilt angle. More importantly, we found two new periodic GBs with different periodic structures and crystallographic orientations. Electrical measurements on individual GBs show that GB structure strongly affects the transport properties. In the normal state, an increasingly stronger electron localization behavior is observed at the GB region with increasing tilt angle. In the superconducting state, the magnitude of the critical current across the GBs is dramatically reduced, associated with local suppression of superconductivity at GBs. These findings provide new understandings on the GB structure of 2D TMCs and the influence of GB on 2D superconductivity, which would be helpful for tailoring the properties of 2D TMCs through GB engineering. Copyright © 2019 American Chemical Society.
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
语种	英语
出版者	American Chemical Society
WOS记录号	WOS:000459222300030
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/151191]
专题	材料科学与工程学院_特聘教授组
作者单位	1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang; 110016, China; 2.School of Materials Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei; 230026, China; 3.Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, 5 Yiheyuan Road, Beijing; 100871, China; 4.State Key Lab of Advanced Processing and Recycling on Non-Ferrous Metals, Lanzhou University of Technology, 287 Langongping Road, Lanzhou; 730050, China; 5.Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, 1001 Xueyuan Road, Shenzhen; 518055, China
推荐引用方式 GB/T 7714	Liu, Zhibo,Xu, Chuan,Wang, Cheng,et al. Grain Boundaries and Tilt-Angle-Dependent Transport Properties of a 2D Mo2C Superconductor[J]. Nano Letters,2019,19(2):857-865.
APA	Liu, Zhibo.,Xu, Chuan.,Wang, Cheng.,Song, Shuang.,Wang, Libin.,...&Ren, Wencai.(2019).Grain Boundaries and Tilt-Angle-Dependent Transport Properties of a 2D Mo2C Superconductor.Nano Letters,19(2),857-865.
MLA	Liu, Zhibo,et al."Grain Boundaries and Tilt-Angle-Dependent Transport Properties of a 2D Mo2C Superconductor".Nano Letters 19.2(2019):857-865.