Preparation and characterization studies on porous flower-like Fe ₃O₄ nanospheres

Porous flower-like Fe₃O₄ nanospheres were assembled by soft templating method using Ammonium Tartrate in elhanol solvent, and then Fe₃O₄ nanospheres with hollow size about 20nm were obtained by the N₂ supercritical drying. SEM, TEM, XRD, BET and VSM techniques were adopted, to characterize the spherical morphology, hollow structure, phase composition, specific surface area and magnetic properties of the final product, respectively. The possible formation mechanism of the porous flower-like Fe₃O₄ nanospheres was discussed. The results indicate that the as-obtained porous flower-like Fe₃O₄ nanospheres were pure, and the specific surface area was 168.61 m ²·g^-1, the saturation magnetization was 84.09 emu·g_-1.