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The core-shell structure Fe3O4@C magnetic nanoparticles were synthesized with superparamagnetic Fe3O4 nanosphere as amagnetic core, glucose, phenolic and soluble starch resin as carbon source via a solvothermal method. The structure of Fe3O4@Cmagnetic nanoparticles was characterizes using TEM, XRD and VSM. The effects of preparation conditions in the structure ofthe Fe3O4@C magnetic nanoparticles were taken out. The results indicate: Fe3O4@Cg magnetic nano particle with glucose ascarbon source has 250 nm diameter and 8-10 nm thickness of carbon shell; Fe3O4@Cp has 160 nm diameter and 6-8 nm carbonshell with phenolic as carbon source; when the carbon source changes to soluble starch, the magnetic nano particle prepared with150 nm diameter and 15-20 nm carbon shell. Through XRD, the magnetic nano particles Fe3O4@C synthesized with three kindsof carbon sources have amorphous carbon diffraction peak except for all the characteristic peaks of Fe3O4. The magnetism ofFe3O4@Cg, Fe3O4@Cp and Fe3O4@Cs are 74.1 emu/g, 48.7 emu/g and 41.3 emu/g, respectively.
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