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 6; Xu, Chuan 6; Wang, Cheng 1,4; Song, Shuang 1,4; Wang, Libin 1,4; Wang, Yujia 6; Kang, Ning 1,4; Ma, Xiuliang 3,6; Cheng, Hui-Ming 2,5,6; Ren, Wencai 5,6
刊名	NANO LETTERS
	2019-02
卷号	19 期号:2 页码:857-865
关键词	2D materials MXene grain boundaries dislocations superconductivity
ISSN号	1530-6984
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.
资助项目	Chinese Academy of Sciences[KGZD - EW - 303 - 1] ; Chinese Academy of Sciences[KGZD - EW - T06] ; Chinese Academy of Sciences[174321KYSB20160011] ; Chinese Academy of Sciences[XDB30000000]
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000459222300030
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/32150]
专题	省部共建有色金属先进加工与再利用国家重点实验室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.Peking Univ, Dept Elect, 5 Yiheyuan Rd, Beijing 100871, Peoples R China 2.Tsinghua Univ, TBSI, 1001 Xueyuan Rd, Shenzhen 518055, Peoples R China 3.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, 287 Langongping Rd, Lanzhou 730050, Gansu, Peoples R China 4.Peking Univ, Key Lab Phys & Chem Nanodevices, 5 Yiheyuan Rd, Beijing 100871, Peoples R China 5.Univ Sci & Technol China, Sch Mat Sci & Engn, 96 Jinzhai Rd, Hefei 230026, Peoples R China 6.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R 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.