摘要
采用改进Hummers法制备氧化石墨,用水合肼还原制得石墨烯。研究了还原剂用量、还原时间、不同还原剂对实验结果造成的影响。通过透射电镜、X射线衍射、红外光谱、热性能测试,分析氧化石墨和石墨烯的结构、形貌及分散性特征。结果表明:氧化石墨的规整性高于石墨烯;氧化石墨烯的层间距较大,说明片层中的带氧基团对扩层有很大影响,超声时间长短对氧化石墨的剥离程度有较大影响;石墨烯的热稳定性优于氧化石墨;用不同还原剂制备所得的石墨烯的分散效果有明显不同,通过红外光谱分析,用乙二胺和氨水还原的石墨烯会引入新的吸收峰,这表明有新的基团被引入,是对石墨烯表面进行的化学修饰。
Graphene was prepared by improved Hummers method. The effects of reducing agent, reduction time, different reducing agents on the results of the experiment were studied. Tested by transmission electron micros- copy, X-ray diffraction, laser particle size, infrared spectroscopy, thermal performance testing, the structure and the dispersion of graphite and graphene oxide ware analyzed, as well as their appearance. The results show that the regu- larity of graphite oxide is higher than graphene. And the space of graphite oxide layers is bigger. It turns out that ae- robic group has a great influence on expanding the space of layers. Ultrasonic time affects stripping levels of graphite oxide. Thermal stability of graphene is higher than graphite oxide＇s. The dispersion result of different kinds of graphene gained by different reducing agents is distinctive. Through infrared spectrum analysis, the graphene obtained by ethanediamine and ammonia reduction has new absorption. It indicates a new group is introduced, and graphene surface has chemical modification.
基金
黑龙江省教育厅基金(12521613)
关键词
石墨烯
氧化石墨
水合肼
氧化还原
graphene, graphite oxide, hydrazine hydrate, redox
