Abstract
Porous magnetic-luminescent Fe3O4@Y2O3:Ln (Ln = Eu, Yb/Er) nanoparticles (NPs) have been fabricated using carbonized ferrocene as templates. Through hydrothermal carbonization of ferrocene, carbon-coated Fe3O4 NPs were obtained, providing both a magnetic core and a good depositing surface to establish a uniform layer of Ln(OH)CO3:Ln. After annealing the pre-synthesized Fe3O4@C@Y(OH)CO3:Ln NPs in air, core–shell Fe3O4@Y2O3:Ln NPs with a porous morphology were synthesized. The as-synthesized NPs are uniform in size with a core diameter of 140 nm and a shell thickness of 20 nm. N2 adsorption–desorption isotherms reveal that these porous NPs possess a large surface area of 32 m2 g−1. After being doped with different lanthanide ions, these NPs can exhibit various down- and up-conversion emissions. Magnetic measurements also indicate that these NPs display superparamagnetic behavior and high magnetization at room temperature.
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