超声辅助Hummers法制备氧化石墨烯

采用超声辅助Hummers法制备氧化石墨烯,单片层厚～1 nm。本法首先在Hummers法的低温、中温反应阶段加入超声振荡,以此来分别提高石墨的插层效率和氧化程度,然后在高温反应开始时,采用把含有残留浓硫酸的混合液缓慢滴入低温去离子水中再加热的方式,以此减少硫酸分子等插入物因为局部温度过高从石墨层间脱出,最后通过低速离心得到氧化石墨。使用超声辅助Hummers法制备氧化石墨烯既方便快捷,又能有效地增大氧化石墨的层间距,且随着超声功率的提高,所得氧化石墨的层间距呈扩大趋势。

Preparation of Graphene Oxide by Ultrasound-Assisted Hummers Method

Graphene Oxide with layer spacing of ~1 nm was prepared by the ultrasound-assisted Hummers method. Firstly, the ultrasonic vibration was applied in the low temperature and mid temperature stages to improve the intercalation efficiency and oxidation degree of Graphite. Secondly, at the beginning of the high temperature stage, the mixed liquid containing residual sulfuric acid was added dropwise into the ice water, then the mixture was heated to the set temperature to avoid the inserting molecule such as sulfuric acid emerging from graphite since the local temperature was too high. Thirdly, Graphite Oxide was obtained after the low-speed centrifugation. Graphite oxide preparation by the title method was convenient and quick. The layer spacing of graphite oxide was effectively expanded and increased with the ultrasonic power.