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分别制备了二氧化硅壳层厚度为10、25和80 nm的三种Ag@S O2纳米粒子,合成了铕与不同比例苯甲酸根(BA)的配合物、铕与1,10-邻菲罗啉(phen)及2,2′-联吡啶(bpy)的配合物,并对其进行表征.表征结果推测配合物的组成为Eu(BA)nCl3-n·2H2O(n=1,2,3)、Eu(phen)Cl3·2H2O和Eu(bpy)Cl3·2H2O.配合物的荧光光谱显示,在加入Ag@Si O2纳米粒子后,复合物的荧光强度有不同程度的增加,这可能是由于表面等离子体共振造成的.不同硅壳厚度的Ag@Si O2纳米粒子的荧光增强顺序是25 nm>80 nm>10 nm,这表明二氧化硅核壳厚度约25 nm时有较强的表面等离子体共振效应.此外,在这些复合物中,Eu(phen)Cl3·2H2O复合物的增强效果是最强的,而Eu(BA)nCl3-n·2H2O的增强效果是最弱的.在三个苯甲酸铕配合物中,Eu(BA)3·2H2O的增强效果最弱,其他两个苯甲酸铕复合物增强效果相对较好.原因可能是含氮配合物(Eu(phen)Cl3·2H2O和Eu(bpy)Cl3·2H2O)可以和Ag@SiO2更好地成键,而苯甲酸铕配合物和Ag@Si O2纳米粒子的作用相对较弱.Ag@SiO2纳米粒子有望应用于增强稀土材料的发光.
Three kinds of Ag @ S O2 nanoparticles with silica shell thickness of 10, 25 and 80 nm were prepared respectively. The complexes of europium with different proportions of benzoate (BA) were synthesized. The complexes of europium with 1,10-phenanthrene (Phen) and 2,2’-dipyridyl (bpy) complexes were synthesized and characterized.The results of the characterization suggested that the complexes were Eu (BA) nCl3-n · 2H2O 3), Eu (phen) Cl3 · 2H2O and Eu (bpy) Cl3 · 2H2O. The fluorescence spectra of the complexes showed that the fluorescence intensities of the complexes increased to some extent after the addition of Ag @ Si O2 nanoparticles, Due to the surface plasmon resonance, the order of fluorescence enhancement of Ag @ Si O2 nanoparticles with different shell thickness is 25 nm> 80 nm> 10 nm, which indicates that the surface of silica core shell has a stronger surface at about 25 nm In addition, the enhancement effect of Eu (phen) Cl3 · 2H2O composite is the strongest in these complexes, while the enhancement effect of Eu (BA) nCl3-n · 2H2O is the weakest in these complexes. Eu (BA) 3 · 2H 2 O was the weakest in the europium benzoate complexes, and the other two europium benzoate complexes were relatively stronger, which may be due to the complex of Eu (phen) Cl 3 · 2H 2 O And Eu (bpy) Cl3 · 2H2O) Can bond better with Ag @ SiO2, while the action of europium benzoate and Ag @ Si O2 nanoparticles is relatively weak.Ag @ SiO2 nanoparticles are expected to be used to enhance the luminescence of rare earth materials.