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Universal mechanical exfoliation of large-area 2D crystals

Yuan HuangInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaYuhao PanDepartment of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-Nano Devices, Renmin University of China, 100872, Beijing, ChinaRong YangInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaLihong BaoInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaLei MengInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaHailan LuoInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaYongqing CaiInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaGuodong LiuInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaWenjuan ZhaoInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaZhang ZhouInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaLiangmei WuInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaZhili ZhuInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaMing HuangSchool of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of KoreaLiwei LiuCollege of Engineering, Peking University, 100871, Beijing, ChinaLei LiuCollege of Engineering, Peking University, 100871, Beijing, ChinaPeng ChengInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaKehui WuInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaShibing TianInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaChangzhi GuInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaYouguo ShiInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaYanfeng GuoSchool of Physical Science and Technology, Shanghai Tech University, 201210, Shanghai, ChinaZhi Gang ChengInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaJiangping HuInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaLin ZhaoInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaGuanhua YangInstitute of Microelectronics of Chinese Academy of Sciences, 100029, Beijing, ChinaEli SutterDepartment of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588, United StatesPeter SutterDepartment of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588, United States. [email protected]Yeliang WangInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, ChinaWei JiDepartment of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-Nano Devices, Renmin University of China, 100872, Beijing, China. [email protected]Xingjiang ZhouInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, China. [email protected]Hong-Jun GaoInstitute of Physics, Chinese Academy of Sciences, 100190, Beijing, China. [email protected]

2020en

ABI

Annotatsiya

Two-dimensional materials provide extraordinary opportunities for exploring phenomena arising in atomically thin crystals. Beginning with the first isolation of graphene, mechanical exfoliation has been a key to provide high-quality two-dimensional materials, but despite improvements it is still limited in yield, lateral size and contamination. Here we introduce a contamination-free, one-step and universal Au-assisted mechanical exfoliation method and demonstrate its effectiveness by isolating 40 types of single-crystalline monolayers, including elemental two-dimensional crystals, metal-dichalcogenides, magnets and superconductors. Most of them are of millimeter-size and high-quality, as shown by transfer-free measurements of electron microscopy, photo spectroscopies and electrical transport. Large suspended two-dimensional crystals and heterojunctions were also prepared with high-yield. Enhanced adhesion between the crystals and the substrates enables such efficient exfoliation, for which we identify a gold-assisted exfoliation method that underpins a universal route for producing large-area monolayers and thus supports studies of fundamental properties and potential application of two-dimensional materials.

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Identifikatorlar

DOI: 10.1038/s41467-020-16266-w

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