Journal
NATURE COMMUNICATIONS
Volume 11, Issue 1, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41467-020-16266-w
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Funding
- National Key Research and Development Program of China [2019YFA0308000, 2018YFA0305800, 2018YFE0202700, 2018YFA0704201]
- Youth Innovation Promotion Association of CAS [2019007, 2018013, 2017013]
- National Natural Science Foundation of China [11874405, 11622437, 61674171, 61725107, 61971035, 11974422]
- National Basic Research Program of China [2015CB921300]
- Chinese Academy of Sciences [XDB25000000, XDB30000000]
- Research Program of Beijing Academy of Quantum Information Sciences [Y18G06]
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0016343]
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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. Here, the authors develop a one-step, contamination-free, Au-assisted mechanical exfoliation method for 2D materials, and isolate 40 types of single-crystalline monolayers, including elemental 2D crystals, metal-dichalcogenides, magnets and superconductors with millimetre size.
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