研究目的
To investigate the producibility of graphene–BN nanosheet heterostructures by a milling process and subsequently by an exfoliation method, aiming to increase the amount of final product and achieve thinner and larger sheets compared to previous methods.
研究成果
Graphene–BN nanosheet heterostructures were successfully synthesized using a milling-assisted liquid phase exfoliation method. The process resulted in thinner and larger sheets compared to previous studies, but with some residual amorphous structures and defects. The method shows potential for improving product yield and sheet quality, suggesting further optimization to minimize amorphization and defects.
研究不足
The milling process caused high amorphization (almost 90%) and defects in the sheets, and some amorphous structures remained in the samples despite acid and thermal treatments. The method may not completely remove amorphous content and could introduce structural imperfections.
1：Experimental Design and Method Selection:
The study used a liquid phase exfoliation method assisted by a pre-milling process to produce graphene–BN nanosheet heterostructures. The rationale was to reduce the size of micro-sized hexagonal sheets through milling before exfoliation to enhance product yield.
2：Sample Selection and Data Sources:
Starting materials were hexagonal graphite (h-G, Merck,
3：5%) and hexagonal boron nitride (h-BN, Merck, 5%) powders. List of Experimental Equipment and Materials:
Equipment included a Fritsch Pulverisette Premium line 7 milling device, magnetic stirrer, ultra-sonic homogenizer (Bandelin Sonoplus, model HD 3200, 200 W), centrifuge, vacuum oven, UV–vis spectroscopy (Shimadzu UV 3600), HRTEM (JEOL Jem 2100F), FESEM (Jeol Jsm-7001F), Raman spectroscopy (Witec snom-Raman), and TGA (Shimadzu TA-60WS). Materials included H2SO4, HNO3, N,N-dimethylformamide (DMF), ethanol, and distilled water.
4：Experimental Procedures and Operational Workflow:
Powders were dried at 75°C for 2 h, milled with a single 19-mm ball at 400 rpm for 50 h, mixed in equal weights, treated with acid (H2SO4 and HNO3) for 12 h, washed to neutral pH, heated at 950°C in air, sonicated in DMF for 2 h, centrifuged at 5000 rpm for 8 h, washed with ethanol, and dried in a vacuum oven at 75°C for 4 h.
5：Data Analysis Methods:
Characterization was done using UV–vis spectroscopy, HRTEM, FESEM, Raman spectroscopy, and TGA to analyze microstructure, composition, and properties.
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