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以天然石墨粉为原料,采用改进的Hummers法制备氧化石墨烯,将得到的氧化石墨烯水分散液在超声中进行超声破碎,可以得到不同尺寸的氧化石墨烯片,再采用离心工艺进行离心分离,最后得到尺寸分布较窄的氧化石墨烯纳米片。对大量的氧化石墨烯扫描电子显微镜照片进行统计分析发现,通过调整超声功率、超声时间、离心转速和离心时间可以有效地调控得到的氧化石墨烯纳米片的片径尺寸。最后,采用优化后的工艺参数,超声离心工艺制备出了平均片径尺寸约为100nm的氧化石墨烯纳米片,其中尺寸小于100nm氧化石墨烯纳米片的含量超过了60%。
Taking natural graphite powder as raw material, the modified Hummers method was used to prepare graphene oxide. The obtained graphene oxide aqueous dispersion was sonicated in ultrasonic to obtain graphene oxide sheets with different sizes. Centrifugation was also used for centrifugal separation Finally, graphene oxide nanosheets with narrow size distribution were obtained. A large number of graphene oxide scanning electron micrographs were statistically analyzed and found that by adjusting the ultrasonic power, ultrasonic time, centrifugation speed and centrifugation time can be effectively controlled graphene oxide nanoplatelets diameter size. Finally, graphene oxide nanosheets with an average size of about 100 nm were prepared by ultrasonic centrifugation with optimized process parameters. The content of graphene oxide nanosheets less than 100 nm in size was more than 60%.