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Huang, Yuan; Pan, Yu-Hao; Yang, Rong; Bao, Li-Hong; Meng, Lei; Luo, Hai-Lan; Cai, Yong-Qing; Liu, Guo-Dong; Zhao, Wen-Juan; Zhou, Zhang; Wu, Liang-Mei; Zhu, Zhi-Li; Huang, Ming; Liu, Li-Wei; Liu, Lei; Cheng, Peng; Wu, Ke-Hui; Tian, Shi-Bing; Gu, Chang-Zhi; Shi, You-Guo; Guo, Yan-Feng; Cheng, Zhi Gang; Hu, Jiang-Ping; Zhao, Lin; Yang, Guan-Hua; Sutter, Eli; Sutter, Peter; Wang, Ye-Liang; Ji, Wei; Zhou, Xing-Jiang; Gao, Hong-Jun
Nature communications, 05/2020, Volume: 11, Issue: 1Journal Article
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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