【摘要】 通过三步反应成功将铕配合物(EuTP)包覆在纳米核壳结构Ag@SiO2复合颗粒的表面。采用化学还原法制备了粒径25~30nm且分散性良好的纳米银溶胶;然后采用改进的Stber法制备了壳层厚度在20nm左右的Ag@SiO2复合颗粒;以氧化铕、α-噻吩甲酰三氟丙酮、邻菲罗啉为原料制备EuTP,并成功包覆在核壳结构的表面。分别采用TEM、FTIR、XRD等对样品的结构进行了表征,并通过对比相同浓度的三价铕的配合物EuTP与复合粒子Ag@SiO2@EuTP的荧光发射光谱发现,SiO2壳层厚度在20nm左右时Eu配合物的荧光强度明显增强,而且随着核壳结构表面配合物浓度的增大,包覆层的厚度增大,荧光强度也呈现增强趋势,对于稀土的研究具有重要的意义。更多还原

【Abstract】 The europium complex was coated on the surface of core-shell structure Ag@SiO2nanoparticles successfully by three steps.Firstly,nano silver sol with diameters at 25-30nm and good dispersion were prepared through chemical reduction method.Then,the Ag@SiO2composite particles were prepared by a modified Stber method,the thickness of silica shell is about 20nm.Finally,the europium complex with 2-thenoyltrifluoroacetone(TTA)and 1,10-phenanthroline(phen)was synthesized and coated on the surface of core-shell structure Ag@SiO2 successfully.The structure and compositions of the samples were characterized by transmission electron microscope(TEM),Fourier transform infrared spectroscopy(FTIR),X-ray diffraction(XRD).By comparing the fluorescence emission spectrum of Ag@SiO2@EuTP with europium complex with the same concentration,the prepared structure exhibited a good effect on the fluorescence enhancement of Eu3+complex.With the increase of the concentration of EuTP complex on the surface of core-shell structure,fluorescence intensity also shows enhancement to some extent.Therefore,it is very significant to the study of rare earth.更多还原