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Seed-mediated synthesis of NaYF4:Yb, Er/NaGdF4 nanocrystals with improved upconversion fluorescence and MR relaxivity

机译:种子介导的NaYF4:Yb,Er / NaGdF4纳米晶体的合成,具有改善的上转换荧光和MR弛豫性

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摘要

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 NaYF4:Yb, Er/NaGdF4 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.
机译:在单个纳米晶体中合理组合不同功能性镧系元素材料,为开发用于各种生物医学应用的多功能纳米平台提供了一种可行的方法。将两种材料合成和整合在一起的常规方法通常涉及费力的过程,而在单个镧系元素纳米晶体中共掺杂不同的功能离子通常会导致其荧光和磁共振弛豫率降低。在这里,我们提出了一种种子介导的合成途径,以制备核壳结构的NaYF4:Yb,Er / NaGdF4纳米晶体。在上转换镧系元素种子上层的外延生长不仅改善了其上转换荧光,而且产生了具有高磁共振弛豫性的顺磁性壳。所制备的纳米晶体尺寸均匀,在水中稳定并且在修饰后易于结合,这可能成为将来生物医学工程中智能检测或诊断的通用成像工具。

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