研究目的
To develop an ultrasonication-free method for preparing large lateral-sized graphene oxide (LGO) and enhance the thermal conductivity of hybrid films through in situ molecular welding with polyimide for thermal management applications.
研究成果
The ultrasonication-free method successfully produces LGO with an average size of 50 μm × 50 μm, leading to superior thermal conductivity in films. In situ molecular welding with PI further enhances thermal conductivity to 1053.975 W m?1 K?1, demonstrating a promising approach for graphene-based thermal management materials. Future studies could focus on scaling up the process and exploring other polymer systems.
研究不足
The efficiency of the centrifugation method for LGO preparation is low, and the study may have limitations in scalability or optimization of the exfoliation process. Potential areas for optimization include improving the yield and uniformity of LGO sheets.
1：Experimental Design and Method Selection:
The study involves a direct exfoliation method without ultrasonication to obtain LGO, followed by in situ polymerization of polyimide (PI) to weld GO sheets. The methodology includes chemical exfoliation, evaporation-induced self-assembly, carbonization, and graphitization treatments.
2：Sample Selection and Data Sources:
Natural flake graphite (20 mesh) was used as the starting material. GO was prepared and compared with small-sized GO (SGO) from modified Hummers method.
3：List of Experimental Equipment and Materials:
Equipment includes atomic force microscopy (AFM), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and laser flash analysis (LFA). Materials include pyromellitic dianhydride (PMDA), 4,4'-diaminodiphenyl ether (ODA) from Sinopharm Chemical Reagent Co., Ltd.
4：Experimental Procedures and Operational Workflow:
Pre-oxidation treatment and chemical exfoliation without ultrasonication for LGO preparation. Hybrid films fabricated by evaporation-induced self-assembly of GO/polyamide acid (PAA) solution, followed by carbonization and graphitization.
5：Data Analysis Methods:
Structural evaluation using AFM, SEM, EDS, XRD, Raman, XPS; thermal conductivity measured by LFA; data analyzed for crystallite size, interlayer spacing, and thermal properties.
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