▎ 摘　　要

Electron paramagnetic resonance (EPR) spectroscopy was innovatively employed to reveal the particular mechanism for chemical reduction of graphene derivatives in this work. It was found that reduction of graphene oxide can occur in a radical mechanism consisted of the electron transfer (ET) and deoxygenation reaction, which was proved by detecting the relevant radical intermediates and change of radical centers on graphene nanosheet during reactions via EPR method. Further researches of fluorinated graphene also indicated that reduction of graphene derivatives was always involved with radical process initiated by ET reaction. The radical mechanism is further emphasized as the typical characteristic of the graphene chemistry.