石墨烯/碳纳米管气凝胶的制备及其弹性性能

摘要

以Hummers法制备的氧化石墨烯和管径为30～50 nm、长50～100 μm的碳纳米管为原料,采用水热还原法及冷冻干燥处理制备了石墨烯气凝胶和石墨烯/碳纳米管气凝胶,研究了气凝胶的物相组成、微观形貌和弹性性能,分析了碳纳米管对弹性性能的影响机理.结果表明:两种气凝胶均具有三维多孔结构,碳纳米管均匀地分布在石墨烯上,并且缠绕在石墨烯片层的内壁和片层间的连接点处;石墨烯/碳纳米管气凝胶的可回复压缩变形量高达90％,远大于石墨烯气凝胶的;碳纳米管可以有效地防止层叠石墨烯片层间的滑动,提高石墨烯的结构稳固性.%Using graphene oxides prepared by Hummers method and carbon nanotubes with diameters of 30-50 nm and lengths of 50-100 μm as raw materials,the graphene aerogel and graphene/carbon nanotube aerogel were prepared by hydrothermal reduction method followed by freeze-drying treatment.The phase composition,micromorphology and elasticity properties of the aerogels were studied and the effect mechanism of carbon nanotube on the elasticity property was annalyzed.The results show that the two aerogels both had a three-dimensional porous structure.The carbon nanotubes distributed evenly on the graphenes and wrapped the inter wall of the graphene sheets and the connection points between the sheets.The recoverable compressive strain of the graphene/carbon nanotube aerogel was as high as 90％,which was higher than that of the graphene aerogel.The carbon nanotubes can prevent the sliding between the stacked graphene sheets and improve the structure stability of the graphene.