551. Seed-mediated synthesis of NaY F4:Y b, Er/NaGdF4 nanocrystals with improved upconversion fluorescence and MR relaxivity.
- Author
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Guo H, Li Z, Qian H, Hu Y, and Muhammad IN
- Subjects
- Contrast Media chemistry, Hydrophobic and Hydrophilic Interactions, Magnetic Resonance Spectroscopy, Microscopy, Electron, Transmission, Spectrometry, Fluorescence, X-Ray Diffraction, Erbium chemistry, Fluorides chemistry, Gadolinium chemistry, Metal Nanoparticles chemistry, Sodium Compounds chemistry, Yttrium chemistry
- Abstract
Rational combination of different functional lanthanide materials within a single nanocrystal presents a feasible way to develop a multifunctional nanoplatform for various biomedical applications. The conventional methods of synthesizing and integrating two kinds of material together generally involve laborious procedures, whilst codoping different functional ions inside a single lanthanide nanocrystal usually results in a decrease in both its fluorescence and its magnetic resonance relaxivity. Here, we present a seed-mediated synthetic route to prepare core-shell structured NaY F(4):Y b, Er/NaGdF(4) nanocrystals. Epitaxial growth of a gadolinium layer on an upconversion lanthanide seed not only improves its upconversion fluorescence, but also creates a paramagnetic shell with high magnetic resonance relaxivity. The prepared nanocrystals are uniform in size, stable in water and easy for conjugation after modification, which may have the potential to serve as a versatile imaging tool for smart detection or diagnosis in future biomedical engineering.
- Published
- 2010
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