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Biomaterials. 2011 Oct;32(29):7200-8. doi: 10.1016/j.biomaterials.2011.05.094. Epub 2011 Jul 13.

Core-shell NaYF4:Yb3+,Tm3+@FexOy nanocrystals for dual-modality T2-enhanced magnetic resonance and NIR-to-NIR upconversion luminescent imaging of small-animal lymphatic node.

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Advanced Materials Laboratory & Department of Chemistry, Fudan University, Shanghai, PR China.


New core-shell structured NaYF(4):Yb(3+),Tm(3+)@Fe(x)O(y) nanocrystals, with 20 nm Yb(3+),Tm(3+)-co-doped NaYF(4) nanocrystals as a core and 5 nm Fe(x)O(y) nanocrystals as a shell, have been synthesized and characterized by TEM and XRD analysis. These core-shell nanocrystals exhibit excellent near-infrared upconversion luminescence (UCL) emission at 800 nm under excitation by a continuous-wave 980 nm laser and superparamagnetic properties with a saturation magnetization (Ms) of ∼12 emu/g. Water-soluble nanocrystals were obtained by surface ligand exchange of oleic acid-coated precursor nanocrystals, and their internalization within living cells has been investigated by laser scanning UCL microscopy. Furthermore, the obtained core-shell nanocrystals have been applied in dual-modality T(2)-enhanced magnetic resonance (MR) and UCL imaging in vivo of the lymphatic system. Moreover, the toxicity of NaYF(4):Yb(3+),Tm(3+)@Fe(x)O(y) nanocrystals has also been evaluated by MTT assay, IC50 values, and histological analysis of lymphatic node sections.

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