Large-size ultrathin 2D materials, with extensive applications in optics, medicine, biology, and semiconductor fields, can be prepared through an existing common physical and chemical process. However, the current exfoliation technologies still need to be improved upon with urgency. Herein, a novel and simple "ultrasonic-ball milling" strategy is reported to effectively obtain high quality and large size ultrathin 2D materials with complete lattice structure through the introduction of moderate sapphire (Al2 O3 ) abrasives in a liquid phase system. Ultimately numerous high-quality ultrathin h-BN, graphene, MoS2 , WS2 , and BCN nanosheets are obtained with large sizes ranging from 1-20 µm, small thickness of ≈1-3 nm and a high yield of over 20%. Utilizing shear and friction force synergistically, this strategy provides a new method and alternative for preparing and optimizing large size ultrathin 2D materials.

中文翻译：

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超声波球磨：一种制备大尺寸超薄二维材料的新颖策略。

可以通过现有的常见物理和化学过程来制备在光学，医学，生物学和半导体领域得到广泛应用的大型超薄2D材料。但是，目前的去角质技术仍然需要紧急改进。在此，据报道，通过在液相系统中引入适度的蓝宝石（Al2 O3）磨料，新颖，简单的“超声波球磨”策略可以有效地获得具有完整晶格结构的高质量和大尺寸超薄2D材料。最终获得了许多高质量的超薄h-BN，石墨烯，MoS2，WS2和BCN纳米片，其尺寸范围从1-20 µm，厚度小到≈1-3nm，高产率超过20％。协同利用剪切力和摩擦力，