研究目的
To develop a universal method for large-yield and high-concentration exfoliation of two-dimensional hexagonal boron nitride nanosheets (hBNNS) for applications in electronic packaging and high-power devices.
研究成果
The hydrothermal exfoliation method successfully exfoliated 2D hBNNS in a large yield of ~55% and a high concentration of ~4.13 mg/mL. The method was found to be universally applicable for the exfoliation of 2D materials and showed promising results in enhancing the photocatalytic activities of TiO2.
研究不足
The method's effectiveness is dependent on the solvent's polarity and the Li+ intercalation, which may limit its applicability to certain materials. The high chemical resistance and thermal stability of bulk hBN may also pose challenges for exfoliation under different conditions.
1：Experimental Design and Method Selection:
A facile hydrothermal exfoliation method was proposed for the first time to exfoliate hBNNS in a large yield and high concentration. The method involves lithium ion (Li+) intercalation, isopropanol (IPA) solvent, and strong stirring under optimized hydrothermal conditions.
2：Sample Selection and Data Sources:
Bulk hBN powder was used as the starting material. The exfoliation performance was evaluated by the Tyndall effect, AFM, TEM, XRD, XPS, FTIR, and UV–Vis spectroscopy.
3：List of Experimental Equipment and Materials:
Teflon-lined stainless steel autoclave (Microreactor, Yanzheng Instrument Ltd. Shanghai), bulk hBN powder, LiCl, IPA, DMF, NMP, 1-octanol, H2O.
4：2O.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: 150-mg bulk hBN powder was dispersed in the solvent, and an additional 4 mg LiCl was added in the Li+-assisted exfoliation experiment. The dispersion was sealed in an autoclave and heated at 180 °C for 12 h under strong stirring (500 rpm). After cooling, the product was centrifuged, and the supernatant was decanted for characterization.
5：Data Analysis Methods:
The exfoliation performance was evaluated by the Tyndall effect, AFM, TEM, XRD, XPS, FTIR, and UV–Vis spectroscopy.
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