The SiO₂@SiO₂:Tb(1,2-BDC)₃phen microspheres with monodispersed core-shell structure, are kind of fluorescent particles, which are prepared by a seeded growth method under the catalysis of glacial acetic acid (1,2-BDC, 1,2-benzenedicarboxylic acid; phen, 1,10-phenanthroline). Firstly, silica seed was fabricated by the hydrolysis of ethyl orthosilicate, and the Tb(1,2-BDC)₃phen was prepared by using 1,2-BDC and phen. Then, a thin mesoporous silica shell doped with Tb(1,2-BDC)₃phen was grown on the prepared monodisperse silica colloids. The prepared phosphor was analyzed by Fourier-transform infrared spectroscopy, X-ray diffraction analysis, scanning electron microscopy, transmission electron microscopy, thermogravimetric and fluorescence spectroscopy. The experimental results showed that the diameter of the SiO₂@SiO₂:Tb((1,2-BDC)₃phen microsphere was about 200 nm with a typical core-shell structure, among which the diameter of the silica core was 180 nm, and that of the mesoporous silicon shell doped with terbium complex was about 10 nm. The fluorescence intensity of SiO₂@SiO₂:Tb((1,2-BDC)₃phen microsphere is nearly three times higher than that of Tb((1,2-BDC)₃phen complexes. The prepared microspheres could be widely used in bio-imaging, optoelectronic appliances and medical diagnosis.

中文翻译：

---

溶胶-种子法制备单分散核壳结构SiO2@SiO2:Tb(1,2-BDC)3phen微球及其荧光表征

SiO ₂ @SiO ₂ :Tb(1,2-BDC) ₃ phen微球具有单分散核壳结构，是一种荧光颗粒，是在冰醋酸(1,2 -BDC，1,2-苯二甲酸；苯，1,10-菲咯啉）。首先，通过原硅酸乙酯水解制备二氧化硅种子，并利用1,2-BDC和苯酚制备Tb(1,2-BDC) ₃苯酚。然后，掺杂了 Tb(1,2-BDC) ₃的薄介孔二氧化硅壳phen 在制备的单分散二氧化硅胶体上生长。通过傅里叶变换红外光谱、X 射线衍射分析、扫描电子显微镜、透射电子显微镜、热重和荧光光谱分析制备的荧光粉。实验结果表明，SiO ₂ @SiO ₂ :Tb((1,2-BDC) ₃ phen微球的直径约为200 nm，具有典型的核壳结构，其中二氧化硅核的直径为180 nm , 掺铽配合物的介孔硅壳的荧光强度约为 10 nm. SiO ₂ @SiO ₂ :Tb((1,2-BDC) ₃phen微球比Tb((1,2-BDC) ₃ phen复合物高近三倍，制备的微球可广泛应用于生物成像、光电设备和医疗诊断。