Modified Molten Salt Assisted Exfoliation of Large-Size 2D Materials

2D materials hold great promise for numerous applications, and the physical properties of individual 2D materials depend strongly on their thickness and lateral size. Currently, there is a lack of a straightforward method to produce 2D materials with both high-quality and ultra-high aspect ratios. Herein, a modified molten salt-assisted exfoliation (MMSAE) strategy is proposed to prepare high-quality 2D materials with large sizes and controllable thickness. The MMSAE approach involves using high-frequency disturbance to create a shear force that peels off the layers of the intercalated material (e.g., graphene, MoS2, WS2, and clays), resulting in the successful and efficient exfoliation of 2D material. Taking h-BN for example, the MMSAE approach achieves the preparation of 2D h-BN with an average lateral size of 6.30 mu m, thickness of 2.34 nm, and a high aspect ratio of 2692. This paper proposes a modified molten salt assisted exfoliation (MMSAE) strategy to prepare high-quality 2D materials. The MMSAE approach involves using high-frequency disturbance to create a shear force that results in the successful and efficient exfoliation of 2D material. Taking h-BN as an example, an average lateral size of 6.30 mu m could be achieved.image