Abstract Hexagonal boron nitride (hBN) is an ultra-wide bandgap insulating material, which possesses a graphite-like layered structure, and the two-dimensional (2D) hexagonal boron nitride nanosheets (hBNNS), exfoliated from the bulk hBN, have promising applications in electronic packaging and high-power devices, due to the high thermal conductivity, excellent thermal/chemical stability as well as the ultra-wide band gap. However, the exfoliation of hBNNS is still a challenge with respect to high cost, time consuming, and low yield. Herein, a facile hydrothermal exfoliation method was proposed for the first time to exfoliate the hBNNS in a large yield and high concentration. In the optimized hydrothermal conditions, the lithium ion (Li+) intercalation, isopropanol (IPA) solvent, and the strong stirring could give rise to a large exfoliation yield up to ∼55% and a high concentration ∼4.13 mg/mL. In addition, the exfoliated hBNNS could enhance the methyl orange (MO) photodegradation efficiency of TiO2 from 91% to 96.4 %. Most importantly, this hydrothermal exfoliation method could be a universal approach for the exfoliation of 2D materials.

中文翻译：

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一种二维六方氮化硼纳米片大产量高浓度剥离的通用方法

摘要 六方氮化硼 (hBN) 是一种超宽带隙绝缘材料，具有类石墨层状结构，从块体 hBN 剥离的二维 (2D) 六方氮化硼纳米片 (hBNNS) 具有广阔的应用前景。在电子封装和大功率器件中，由于高导热性、优异的热/化学稳定性以及超宽带隙。然而，hBNNS 的剥离仍然存在成本高、耗时和产量低的挑战。在此，首次提出了一种简便的水热剥离方法，以大产率和高浓度剥离 hBNNS。在优化的水热条件下，锂离子 (Li+) 插层、异丙醇 (IPA) 溶剂、强烈搅拌可产生高达 55% 的大剥离率和 4.13 mg/mL 的高浓度。此外，剥离的 hBNNS 可以将 TiO2 的甲基橙 (MO) 光降解效率从 91% 提高到 96.4%。最重要的是，这种水热剥离方法可能是二维材料剥离的通用方法。