▎ 摘　　要

One-step hydrothermal reaction and complexation method was used to prepare the extra uniform gamma-Fe2O3 nanoparticles@multi-layer graphene, which was unnecessary to introduce oxygen function group on graphene. Multi-layer graphene was prepared by simple sonication method that will not introduce rich oxygen functional groups on its surface. Reagent FeCl2, mixture solvent DMF and water were used for hydrothermal reaction, in which DMF could form complexion with metal ion. The effects of sodium acetate, reaction temperature and filling ratio on the prepared product were studied. X-ray diffraction(XRD), X-ray photoelectron spectroscope(XPS), scanning electron microscope (SEM), and transmission electron microscope (TEM) were used to analyze the microstructures of the composite materials. The magnetic properties of the composites were measured by vibrating sample magnetometer (VSM). The results show that pi-pi reaction between carbon ring and complexation of Fe2+ with DMF can be used to prepare iron oxide on the multi-layer graphene. Homogeneous gamma-Fe2O3 nanoparticles with size less than 10 nm can be prepared through the control of oxidation speed of Fe2+ and growth velocity of iron oxide, with good magnetic properties.