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

doi:10.1021/acs.nanolett.8b04065

	Grain Boundaries and Tilt-Angle-Dependent Transport Properties of a 2D Mo2C Superconductor
	Liu, Zhibo 1; Xu, Chuan 1; Wang, Cheng 3,4; Song, Shuang 3,4; Wang, Libin 3,4; Wang, Yujia 1; Kang, Ning 3,4; Ma, Xiuliang1,5 ; Cheng, Hui-Ming 1,2,6; Ren, Wencai 1,2
	2019-02-13
发表期刊	Nano Letters
ISSN	15306984
卷号	19 期号:2 页码:857-865
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.
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
DOI	10.1021/acs.nanolett.8b04065
收录类别	EI ; SCIE
语种	英语
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
WOS类目	Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS记录号	WOS:000459222300030
出版者	American Chemical Society
EI入藏号	20190706492255
EI主题词	Structural properties
EI分类号	408 Structural Design ; 531 Metallurgy and Metallography ; 708.3 Superconducting Materials ; 741.3 Optical Devices and Systems ; 761 Nanotechnology ; 804 Chemical Products Generally ; 804.2 Inorganic Compounds ; 931.2 Physical Properties of Gases, Liquids and Solids ; 942.2 Electric Variables Measurements ; 951 Materials Science
引用统计	被引频次：17[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/151191
专题	材料科学与工程学院_特聘教授组
通讯作者	Kang, Ning; Ma, Xiuliang; Ren, Wencai
作者单位	1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China; 2.Univ Sci & Technol China, Sch Mat Sci & Engn, 96 Jinzhai Rd, Hefei 230026, Peoples R China; 3.Peking Univ, Key Lab Phys & Chem Nanodevices, 5 Yiheyuan Rd, Beijing 100871, Peoples R China; 4.Peking Univ, Dept Elect, 5 Yiheyuan Rd, Beijing 100871, Peoples R China; 5.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, 287 Langongping Rd, Lanzhou 730050, Gansu, Peoples R China; 6.Tsinghua Univ, TBSI, 1001 Xueyuan Rd, Shenzhen 518055, Peoples R China
通讯作者单位	省部共建有色金属先进加工与再利用国家重点实验室
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.