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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Stber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。
Eu (EuTP) was successfully coated on the surface of Ag @ SiO2 composite particles with a nanoshell-shell structure by a three-step reaction. Ag @ SiO2 composite particles with shell thickness of about 20 nm were prepared by the modified Stöber method. Eu2 +, α-thiophene Formyltrifluoroacetone, phenanthroline as raw material EuTP, and successfully coated in the surface of the core-shell structure. The structures of the samples were characterized by TEM, FTIR and XRD, respectively. The fluorescence emission spectra of EuTP with the same concentration of trivalent europium and composite particles Ag @ SiO2 @ EuTP were found. The results show that the thickness of SiO2 shell is about 20nm The fluorescence intensity of the Eu complex is obviously enhanced. With the increase of the concentration of the complex on the surface of the core-shell structure, the thickness of the coating increases and the fluorescence intensity tends to increase, which is of great significance for the study of rare earth.