Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 21, Issue 22, Pages 8104-8109Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm10622h
Keywords
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Funding
- National Natural Science Foundation of China [51072087, 50902076]
- Natural Science Foundation of Shandong Province [2009ZRB01420]
- Programs for Science and Technology Development of Shandong Province [2009GG10003031]
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Bifunctional magnetic-optical Fe3O4@SiO2@Y2O3 : Yb3+, Er3+ near-infrared-to-visible up-conversion nanoparticles (UCNPs) with core-shell structures have been successfully fabricated by a facile layer-by-layer method. The presented materials were characterized by XRD, FTIR, TEM, fluorescence spectrophotometer, NMR Analyzer and SQUID MPMS. The results showed that the Fe3O4 cores were uniformly coated by SiO2 and Y2O3 : Yb3+, Er3+ layers. The amorphous silica used as the transition layer of UCNPs played an essential role in directing the structure of the composites. The inner Fe3O4 cores and the outer Y2O3 : Yb3+, Er3+ layers endow the composites with robust magnetic responsive properties and strong up-conversion fluorescent properties, which endow the nanoparticles with great potential applications in drug targeting, bioseparation and diagnostic analysis.
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