高速剪切辅助氧化还原法制备石墨烯

Preparation of Graphene by High Speed Shearing-assisted Oxidization-Reduction Method

采用改进的Hummers法制备氧化石墨(GO),氧化石墨经高剪切分散乳化机高速剪切处理后进行超声波处理剥离得到氧化石墨烯,然后经水合肼还原得到石墨烯。利用激光粒度仪、扫描电子显微镜(SEM)、X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FT-IR)、热重分析仪(TGA)、激光拉曼光谱仪(Raman)和四探针测试仪等对氧化石墨和石墨烯的形貌及结构进行表征。将高剪切处理制备的石墨烯和未经高剪切处理制备的石墨烯进行对比,结果表明,高速剪切作用对氧化石墨的减薄和剥离有明显促进作用,有利于氧化石墨的还原,提高了石墨烯的制备效率和质量。

Graphite oxide （GO） was synthesized by modified Hummers method from natural flake graphite （GRA）. GO was treated by high-speed shearing machine in high speed and was exfoliated to graphene oxide by ultra- sonic wave with ultrasonic cleaning machine. Hydrazine hydrate was added as reducing reagent to prepare reduced gra- phene oxide （RGO） by reflux reaction. GO and RGO were characterized by laser particle analyzer, SEM, XRD, FT- IR, TGA,Raman and four-probe tester. RGOs that were treated with high-speed shearing and untreated were com- pared. The characterization results showed that high-speed shearing promotes the thinning and exfoliation of graphene oxide, which was beneficial to the reduction of graphene oxide and improved the preparation efficiency and quality of graphene.