Study on Structural Evolution and Properties of Fluorinated Graphene Regulated by Fluorination Degree

Abstract

In this study, graphene was prepared from natural flake graphite via secondary chemical intercalation, microwave expansion, and liquid-phase reduction. Flu- orinated graphene with different fluorine-to-carbon (F/C) ratios was then syn- thesized at various temperatures using direct gas fluorination. Characterizations by SEM, AFM, BET, XPS, and TGA showed that as the fluorination degree increased (F/C ratio from 0.344 to 1.045), the average particle size and layer number of fluorinated graphene flakes decreased, the specific surface area in- creased, and the C-F bonding transformed from semi-ionic to covalent bonds, significantly enhancing thermal stability. This study reveals the regulatory mechanism of fluorination degree on the structure and properties of fluorinated graphene (FG), providing a theoretical basis for its wide applications.