一种可分散性石墨烯的制备

先通过γ-氨丙基三乙氧基硅烷(KH-550)与氧化石墨反应得到改性氧化石墨, 再经水合肼还原制备了改性石墨烯. 未烘干的改性石墨烯经超声处理后, 可稳定分散于体积比为9∶1的N,N-二甲基甲酰胺/水或丙酮/水的混合溶液中, 而且在N,N-二甲基甲酰胺/水体系中超声得到的改性石墨烯分散液可在乙醇、丙酮中稳定存在. 采用红外光谱、X光电子能谱及X射线衍射分析等手段研究了KH-550改性氧化石墨及石墨烯的结构. 结果表明, KH-550上的氨基与氧化石墨的羧基反应生成了酰胺键, 与环氧基发生了加成反应, 干燥的改性石墨烯层间通过Si-O-Si键连接在一起.

Preparation of a Dispersible Graphene

Graphene is a functional material with manifold excellent performances, however, its chemical inactive have been hampering its development. The preparation of dispersible graphene is an important mean to the application of graphene. A functionalized graphene(FG) was prepared by treatment of graphite oxide(GO) with γ-aminopropyl-triethoxysilane, and then reduced by hydrazine hydrate. The functionalized graphene without dried can be stable dispersed in DMF/H2O(9∶1, volume ratio) and acetone/H2O(9∶1, volume ratio), and the suspension of functionalized graphene in DMF/H2O(9∶1, volume ratio) can also be dispersed in ethanol or acetone. Infrared spectroscopy(FTIR), X-ray photoelectron spectroscopy(XPS), X-ray diffraction(XRD) were used to characterize the structures of FGO and FG. The results show that the amino on the KH-550 reacted with carboxyl of graphite oxide generating amide, and happened addition reaction with epoxy of graphite oxide. The dried functionalized graphene layers bond with Si—O—Si.