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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Upconversion-luminescent/magnetic dual-functional sub-20 nm core-shell SrF2:Yb, Tm@CaF2:Gd heteronanoparticles
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Upconversion-luminescent/magnetic dual-functional sub-20 nm core-shell SrF2:Yb, Tm@CaF2:Gd heteronanoparticles

机译：上转换发光/磁性双功能亚纳米20 nm核壳SrF2：Yb，Tm @ CaF2：Gd异质颗粒

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摘要

Sub-20 nm core-shell and water-soluble SrF2:Yb, Tm@CaF2:Gd heteronanoparticles with both upconversion luminescence (UCL) and magnetic resonance imaging (MRI) capabilities were designed and synthesized via a two-step hydrothermal method. In the design of the heteronanoparticles, SrF2:Yb,Tm nanoparticles with high UCL efficiency are chosen as the core material for strong UCL output; and by epitaxially coating the SrF2:Yb, Tm core particles with inert and biocompatible shells of CaF2:Gd, the core-shell heteronanoparticles are endowed with a magnetic capability (longitudinal relaxivity of 2.4 mM(-1) s(-1)) for MRI, as well as an enhancement of the near infrared (NIR) UCL by 9.2 times. The aqueous dispersion of SrF2:Yb, Tm@CaF2:Gd heteronanoparticles with a concentration of 2.6 wt% can emit NIR UCL so as to be easily detected with a fiber optical spectrometer under illumination of a 975 nm laser diode with a power density of 8.8 W cm(-2). Such a dispersion with a Gd3+ concentration of 0.0143 mM in the shell region of the heteronanoparticles can also generate the detectable quickening of longitudinal relaxation. The results promise the strong potential of this nanomaterial for applications in bioimaging as a dual-functional probe.
机译：设计并合成了具有上下转换发光（UCL）和磁共振成像（MRI）功能的亚20 nm核壳和水溶性SrF2：Yb，Tm @ CaF2：Gd杂纳米颗粒，并通过两步水热法合成。在异质颗粒的设计中，选择具有较高UCL效率的SrF2：Yb，Tm纳米颗粒作为增强UCL输出的核心材料。并通过惰性和生物相容的CaF2：Gd壳外延涂覆SrF2：Yb，Tm核颗粒，使核-壳杂纳米颗粒具有磁性（纵向弛豫度为2.4 mM（-1）s（-1）） MRI，以及将近红外（NIR）UCL增强9.2倍。浓度为2.6 wt％的SrF2：Yb，Tm @ CaF2：Gd杂纳米颗粒的水分散体可以发射NIR UCL，以便在功率密度为8.8的975 nm激光二极管的照明下易于用光纤光谱仪检测到。宽cm（-2）。在异纳米颗粒的壳区域中具有0.0143mM的Gd 3+浓度的这种分散体也可以产生可检测到的纵向弛豫的加快。该结果有望将该纳米材料作为双功能探针应用于生物成像中。

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