One-step synthesis of Co–Ni ferrite/graphene nanocomposites with controllable magnetic and electrical properties

Co1−xNixFe2O4/graphene nanocomposites were synthesized through a one-step solvothermal method. The as-synthesized products were characterized by X-ray powder diffraction, field emission scanning microscopy, transmission electron microscope, and high-resolution transmission electron microscope. The results show that the Co1−xNixFe2O4 nanoparticles are uniformly dispersed on graphene sheets. The dependence of structure, magnetic and electrical properties of Co1−xNixFe2O4/graphene nanocomposites on the Ni2+ concentration and the graphene content were also studied. The saturation magnetization and electrical conductivity of the as-prepared products reached 51.82 emu/g and 1.00 × 102 S/m, respectively.

► Multiple doping Fe3O4 ferrite/graphene with Co2+ and Ni2+ was prepared. ► An efficient and environmentally friendly one-step solvothermal method was used. ► The magnetic and electrical properties of the productions are excellent and controllable.