Multifunctional visible/near-infrared luminescent core-shell magnetic silica structured nanocomposites

In this paper, we report the fabrication and characterization of magnetic silica nanospheres covalently bonded with near-infrared (NIR) and ultraviolet-visible (UV-vis) luminescent lanthanide complexes [denoted as Fe 3 O 4 @SiO 2 @Ln-PABI/SiO 2 (Ln = Nd, Eu)]. Fe 3 O 4 @SiO 2 @Ln-PABI/SiO 2 (Ln = Nd...

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Bibliographic Details
Published in:CrystEngComm 2014-01, Vol.16 (27), p.6257-6262
Main Authors: Weng, Y. R, Zhao, J, Yu, S. Y, Song, S. Y
Format: Article
Language:English
Subjects:
Emission spectroscopy
Luminescence
Magnetic properties
Nanocomposites
Nanospheres
Neodymium
Scanning electron microscopy
Silicon dioxide
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Summary:In this paper, we report the fabrication and characterization of magnetic silica nanospheres covalently bonded with near-infrared (NIR) and ultraviolet-visible (UV-vis) luminescent lanthanide complexes [denoted as Fe 3 O 4 @SiO 2 @Ln-PABI/SiO 2 (Ln = Nd, Eu)]. Fe 3 O 4 @SiO 2 @Ln-PABI/SiO 2 (Ln = Nd, Eu) nanospheres with an average size of 150-200 nm were synthesized via incorporation of the chelate ligand PABI ( N -(4-benzoic acid-yl)- N ′-(propyltriethoxysilyl) urea) with Ln (Nd, Eu) into a framework of magnetic silica (denoted as Fe 3 O 4 @SiO 2 ), followed by a modified Stöber method and a layer-by-layer assembly technique. The morphological, structural, textural, magnetic, NIR luminescence and UV luminescence properties were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), vibrating sample magnetometry, and photoluminescence spectroscopy. These multifunctional nanocomposites exhibit superparamagnetic behavior, and the characteristic NIR emission and UV emission of Nd 3+ and Eu 3+ , respectively. Such materials with superparamagnetic and lanthanide-based near-infrared and UV luminescence properties have several advantages for potential applications in optical imaging or as biological luminescent labels. Magnetic silica nanospheres covalently bonded with near-infrared (NIR) and ultraviolet-visible (UV-vis) luminescent lanthanide complexes were synthesized.
ISSN:1466-8033
1466-8033
DOI:10.1039/c4ce00067f