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采用直接沉淀法合成了Fe3O4@YF3:Eu3+核壳结构磁性-荧光性双功能纳米复合颗粒,对其结构和性能进行了表征。XRD分析表明,得到了结晶良好的尖晶石型Fe3O4纳米晶和正交相的YF3纳米晶。TEM照片表明,双功能复合颗粒具有明显的核壳结构。构成核的Fe3O4纳米颗粒尺寸在40～80 nm之间。Fe3O4@YF3:Eu3+核壳结构复合纳米颗粒的尺寸约为100～250 nm,壳层YF3:Eu3+厚度介于20～30 nm之间。EDS分析表明样品由Y,F,Eu,O和Fe元素组成。荧光光谱和磁性测试结果表明,复合颗粒同时具有良好的发光性和较强的磁性,使其在生物医学领域具有潜在的应用。
The magnetic and fluorescent bifunctional nanocomposite particles with Fe3O4 @ YF3: Eu3 + core-shell structure were synthesized by direct precipitation method, and their structures and properties were characterized. XRD analysis shows that the crystal of spinel-type Fe3O4 nanocrystals and the orthorhombic YF3 nanocrystals are obtained. TEM photographs show that the bifunctional composite particles have a clear core-shell structure. The size of the Fe3O4 nanoparticle that constitutes the nucleus is between 40 and 80 nm. The size of Fe3O4 @ YF3: Eu3 + core-shell composite nanoparticles is about 100-250 nm, and the shell thickness of YF3: Eu3 + ranges from 20-30 nm. EDS analysis showed that the sample consisted of Y, F, Eu, O and Fe elements. Fluorescence spectroscopy and magnetic test results show that the composite particles have both good luminescence and strong magnetic properties, which makes them potential applications in the biomedical field.