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

Abstract 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, MoS 2 , WS 2 , 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 µm, thickness of 2.34 nm, and a high aspect ratio of 2692.