Abstract In this work, fluorinated graphene (FG) nanosheets with different F/C fluorination degree were synthesized by a convenient gas phase fluorination method. Ionic liquids was used to modify the FG to improve its dispersion and compatibility in polyimide (PI). The thermal, mechanical and tribological properties of FG/PI composite coatings were investigated systematically. The morphology of FG was observed by Transmission electron microscopy (TEM) and scanning probe microscope (SPM). The physical and chemical properties of the FG were characterized by a large number of measurement methods, such as X-ray powder diffraction (XRD), Raman spectra, X-ray photo-electronic spectroscopy (XPS) and so on. Fourier transformed infrared spectra (FTIR) was used to confirm the successful modification of ILs. And the Chemical composition of the PI coating was investigated by XPS and FTIR measurements. On the basis of the stable dispersion of FG in the PI matrix, compared with pure PI, the composite coating with (reduced graphene oxide) rGO owned slightly improved thermal, mechanical and tribological properties and the composite coating with FG displayed significant improvement, especially when the F-doped degree was the highest.

中文翻译：

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FG纳米片的氟化度对FG/PI复合涂层摩擦学性能的影响

摘要 本工作采用简便的气相氟化法合成了不同F/C氟化度的氟化石墨烯(FG)纳米片。离子液体用于改性 FG 以改善其在聚酰亚胺 (PI) 中的分散性和相容性。系统地研究了 FG/PI 复合涂层的热学、机械和摩擦学性能。通过透射电子显微镜（TEM）和扫描探针显微镜（SPM）观察FG的形貌。FG的物理和化学性质通过大量的测量方法进行表征，如X射线粉末衍射（XRD）、拉曼光谱、X射线光电子能谱（XPS）等。傅里叶变换红外光谱 (FTIR) 用于确认 IL 的成功修饰。并通过 XPS 和 FTIR 测量研究了 PI 涂层的化学成分。在 FG 在 PI 基体中稳定分散的基础上，与纯 PI 相比，含（还原氧化石墨烯）rGO 的复合涂层的热性能、机械性能和摩擦学性能略有改善，含 FG 的复合涂层显示出显着改善，尤其是当F掺杂程度最高。