Abstract
A facile, anion‐induced, one‐pot solvothermal method was successfully developed to prepare two kinds of highly dispersed magnetic Fe3O4 submicrometer spheres at 200°C in 12 h. The diameters of the as‐prepared Fe3O4 submicrometer spheres are ~500 and ~200 nm, respectively. With the guidance of OAc − ions, the size and morphology of the Fe3O4 spheres could be well controlled. The saturation magnetization of the Fe3O4 spheres was measured to be 84 and 74 emu/g, respectively. The assembly of tiny precursor nuclei into the Fe3O4 spheres relies on Ostwald ripening. The synthesized Fe3O4 submicrometer spheres show good magnetic response, good water solubility, and uniform size.
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