磁性荧光双功能复合纳米粒子Fe3O4@SiO2@ZrO2:Tb3+的合成和表征

通过原位反应合成法成功合成了一种新型水溶性的磁性荧光复合纳米粒子Fe₃O₄@SiO₂@ZrO₂:Tb³⁺,并通过扫描电子显微镜(SEM)、X射线粉末衍射仪(XRD)、红外光谱仪(FT-IR)、磁性测试仪和荧光(PL)光谱对其形貌、尺寸、相组成、磁性和荧光性能进行了表征。 结果表明,核(Fe₃O₄@SiO₂)壳(ZrO₂:Tb³⁺)结构组成的磁性荧光复合纳米粒子具有超顺磁性,其饱和磁化强度达到36 emu/g,并且在494 nm(⁵D₄→⁷F₆)、549 nm(⁵D₄→⁷F₅)、587 nm(⁵D₄→⁷F₄)和625 nm(⁵D₄→⁷F₃)处具有4个Tb³⁺特有的荧光发射光谱带峰值。 磁性荧光双功能的复合纳米粒子在生物医学领域具有潜在的应用价值。

Synthesis and Characterization of Magnetic and Fluorescent Bifunctional Fe3O4@SiO2@ZrO2:Tb3+ Spherical Nanocomposites

New water-soluble magnetic and fluorescent Fe₃O₄@SiO₂@ZrO₂:Tb³⁺ nanocomposites(NCs) have been successfully synthesized through the in situ synthesized method. The morphology, size, phase, magnetic properties and fluorescent properties of as-synthesized nanoparticles(NPs) were well investigated by scanning electron microscopy(SEM), X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FT-IR), magnetometer, and photoluminescence(PL) spectra. The magnetic and fluorescent NPs consist of silica-coated Fe₃O₄as the core and the ZrO₂:Tb³⁺ as the shell exhibit superparamagnetism with the saturation magnetization of 36 emu/g and fluorescence properties with four emission bands peaked at approximately 494 nm(⁵D₄→⁷F₆), 549 nm(⁵D₄→⁷F₅), 587 nm(⁵D₄→⁷F₄), and 625 nm(⁵D₄→⁷F₃) of Tb³⁺ ions. The bifunctional magnetic and fluorescence NCs will show potential applications in biomedical fields in the future.