Solvothermal Synthesis of Mesoporous Fe3O4 Nanoparticles in Mixed Solvent of Ethylene Glycol and Water: Structure and Magnetic Properties
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Mesoporous Fe3O4 nanoparticles were synthesized by a solvothermal method, via a mixed solvent of ethylene glycol (EG) and deionized water, using iron chloride and urea as the precursors. The phase, morphology, and pore structure are investigated by the characterization of X-ray diffraction (XRD), transmission electron microscopy (TEM), and N2 isotherm adsorption–desorption. The results show that the amount of water in the mixed solvent plays vital role in controlling the size of Fe3O4 nanoparticles, specific surface area, and pore size. Additionally, solid Fe3O4 nanospheres were prepared using only EG as solvent, while α-Fe2O3 nanosized polyhedrals were obtained with only water as solvent. The mesoporous Fe3O4 nanoparticles show a ferromagnetic behavior, with saturation magnetizations (Ms) of 78–82 emu g− 1 and coercivities (Hc) ranging from 13–58 Oe. The α-Fe2O3 nanoparticles also exhibit a weak-ferrimagnetic character, with a remanent magnetization (Mr) of 0.24 emu g− 1, and Hc of 558 Oe.
KeywordsSolvothermal Mesoporous Fe3O4 α-Fe2O3 Magnetic property
This work has been supported by the National Nature Science Foundation of China (51301114, 21203125, 51602206), Natural Science Foundation of Liaoning Province (201602598, 2015020649), and the Science Research Foundation of Education Department of Liaoning Province (LQ2017011, L2016003).
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Conflict of interests
The authors declare that they have no conflict of interest.
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