简捷水热法制备氟化石墨烯及其表征

Preparation of Fluorinated Graphene by a Simple Hydrothermal Method and Its Characterization

氟化石墨烯是一种石墨烯衍生物,在润滑材料、电子器件等领域具有广阔的应用前景。采用回流搅拌并水热还原的方法制备氟化石墨烯,并在不加HF的情况下以同样的方式制备了水热还原的还原氧化石墨烯(rGO)。采用傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)、拉曼光谱(Raman)、X射线光电子能谱(XPS)、透射电镜(TEM)等对样品进行形貌观测和表征。FTIR的结果表明氟化产物中含有C-F键和部分未完全还原的含氧基团;由XRD谱可以看出,产物晶型较差,其层间距和原料的性质有关;Raman谱证实了石墨烯的基本结构依然存在,但也存在大量缺陷,并且rGO比FGS的规整度略高;XPS谱表明样品表面有氟元素的存在,意味着FGS制备成功;TEM结果显示该样品为单层和少层。该方法操作简单、原料廉价易得、工艺要求不高,适用于批量生产氟化石墨烯。

Fluorinated graphene sheet（FGS）,one of the graphene derivatives,is a promising material in the field of lubricating materials and electronic device.Here,we developed a simple and feasible method to prepare FGS,in which method hydrothermal reaction is carried out after stirring and refluxing.We compared FGS with rGO prepared in the same method except for adding HF through TEM,FTIR,XRD,Raman,XPS and so on.FTIR shows that the FGS we prepared has C-F bond and some oxygen functional groups which have not been reduced yet.From the XRD spectrum,we learn that the FGS and rGO are poor crystals lines and the interlayer spacing of them is related to the raw material＇s characteristics.Raman spectrum reveals the existence of graphene＇s basic structure and a large number of defects.Compared with FGS,the rGO is relatively more regular.Through the XPS,it can be seen obviously that FGS is synthesized successfully.TEM photos shows that both of them have several layers.The hydrothermal process is a simple and safe method with low-cost and available raw material,which makes it suited for industrialization.