Therefore, the bifunctional nanocomposites are expected to develop many potential applications in biomedical fields. Magnetic measurements showed that the obtained bifunctional nanocomposites exhibited superparamagnetic behavior at room temperature. A laser beam source (532nm, Power Diode-Pumped Nd:YVO4 Laser. Photoluminescence (PL) spectra indicated that the nanocomposites displayed a strong red characteristic emission of Eu3+. Core-shell morphology is revealed due to the partial backfilling of the interstitial. Fourier transform infrared (FT-IR) spectra confirmed that the YVO4:Eu3+ had been successfully deposited on the surface of Fe3O4 nanoparticles. The X-ray diffraction (XRD) patterns showed that a cubic spinel structure of Fe3O4 core and a tetragonal phase of YVO4 shell were obtained. The average size was similar to 150 nm, and the thickness of the shell was similar to 15 nm. Transmission electron microscopy (TEM) images revealed that the obtained bifunctional nanocomposites had a core-shell structure and a spherical morphology. These coreshell structured SiO 2 YVO 4:Yb 3+,Er 3+ microspheres may have great potential in the fields of infrared detection and display devices. A facile direct precipitation method has been developed for the synthesis of bifunctional magnetic-luminescent nanocomposites with Fe3O4 nanoparticles as the core and YVO4:Eu3+ as the shell. Preparation and properties of multifunctional Fe 3 O 4 YVO 4 :Eu 3+ or Dy 3+ core-shell nanocomposites as drug carriers Zhiwei Sun,a Lizhu Tong,a Deming Liu,a Jianhui Shi a and Hua Yang a Author affiliations Abstract In this study, the synthesis and characterization is reported for Fe 3 O 4 /YVO 4 :Eu 3+ or Dy 3+ luminomagnetic nanocomposites.
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