Ag@SiO_2纳米复合物对羧酸铕配合物的荧光增强

Fluorescence Enhancement of Ag@SiO_2 Nano Composite to Carboxylate Europium Complexes

分别以苯氧乙酸和对苯二甲酸为阴离子配体,以邻菲罗啉为中性配体,稀土铕离子为中心体,合成了两种三元稀土铕配合物Eu(Phen)L3(L=苯氧乙酸)和Eu2(Phen)2L3'(L'=对苯二甲酸)。利用还原法制备纳米银溶胶,采用改进的Stber法在银纳米颗粒外面包裹二氧化硅,通过控制正硅酸四乙酯(TEOS)的滴加时间和滴加量以控制二氧化硅壳层的生长厚度,得到Ag@SiO2核壳结构颗粒。通过该核壳结构颗粒与DMF溶解的稀土铕配合物的相互作用,得到核壳型Ag@SiO2荧光纳米复合物。结果表明,所得纳米银粒径为50 nm左右,包覆的SiO2壳层厚度约为12 nm。SiO2包覆的纳米银对两种铕配合物的荧光发射有明显的增强作用。

Two europium complexes with terephthalic acid or phenoxyethanoic acid as the first ligand and phenanthroline as secondary ligand are synthesized.Nanometer silver sol is prepared by using reduction method,then the using the silver particles were coated with silica by improved Stber method.By controlling the dropping time and quantity of tetraethyl orthosilicate（TEOS）,the thickness of SiO2 shell was controlled.Europium complexes are dissolved with DMF and then mixed with Ag@SiO2.So we obtain the core-shell nanoparticles composite luminescent materials Ag@SiO2.Results show that the obtained nano silver core has a size of about 50 nm and thickness of the SiO2 core is about 12 nm.This kinds of Ag@SiO2 can significantly enhance the fluorescence emission of europium complexes.