Abstract
Multifunctional Fe3O4@SiO2@Y2O3:Eu3+ composites were prepared with a facile solvothermal method followed by a subsequent heat treatment. Their structure and magnetic and luminescent properties were analyzed and discussed. Y2O3:Eu3+ phosphor as a shell was coated on the surface of Fe3O4@SiO2 as the core to form Fe3O4@SiO2@Y2O3:Eu3+ composites. The particle size of the composites is 262.36 nm which consists of the magnetic core with about 210 nmin diameter and a silica shell with an average thickness of about 20 nm. It exhibits ferromagnetic behavior with the special saturation magnetization Ms of 12.62 emu/g, the negligible coercivity Hc, and remanence Mr at room temperature and exhibits a strong red emission peak originating from the electric–dipole transition 5D0 → 7F2 of Eu3+ ions at 611 nm. The current and potential biomedical uses include biological imaging, cell tracking, and magnetic bioseparation.
Published Version
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