纳米Ag@SiO2核壳结构的表面等离子体共振效应对铕配合物的荧光增强作用

doi:10.3866/PKU.WHXB201409292

物理化学学报 >> 2014, Vol. 30 >> Issue (12): 2328-2334.doi: 10.3866/PKU.WHXB201409292

纳米Ag@SiO₂核壳结构的表面等离子体共振效应对铕配合物的荧光增强作用

李晶晶, 栗源, 王爱玲, 屈燕荣, 岳彬, 周丹, 褚海斌, 赵永亮

内蒙古大学化学化工学院, 呼和浩特 010021

收稿日期:2014-07-31 修回日期:2014-09-28 发布日期:2014-11-27
通讯作者: 褚海斌, 赵永亮 E-mail:binghai99@gmail.com;hxzhaoyl@163.com
基金资助:
国家自然科学基金(21161013), 内蒙古自然科学基金(2011MS0202)和内蒙古重大基础研究开放基金(2010KF03)资助

Surface Plasmon Resonance Enhanced Luminescence of Europium Complexes with Ag@SiO₂ Core-Shell Structure

LI Jing-Jing, LI Yuan, WANG Ai-Ling, QU Yan-Rong, YUE Bin, ZHOU Dan, CHU Hai-Bin, ZHAO Yong-Liang

College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China

Received:2014-07-31 Revised:2014-09-28 Published:2014-11-27
Contact: CHU Hai-Bin, ZHAO Yong-Liang E-mail:binghai99@gmail.com;hxzhaoyl@163.com
Supported by:
The project was supported by the National Natural Science Foundation of China (21161013), Natural Science Foundation of Inner Mongolia, China (2011MS0202), and Opening Foundation for Significant Fundamental Research of Inner Mongolia, China (2010KF03).

摘要/Abstract

摘要：

分别制备了二氧化硅壳层厚度为10、25和80 nm的三种Ag@SiO₂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)_nCl_3-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@SiO₂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@SiO₂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)_nCl_3-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@SiO₂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.

关键词: 铕配合物, 等离子体共振, Ag@SiO₂纳米粒子, 发光强度, 核壳结构

Abstract:

Three types of Ag@SiO₂ nanoparticles with silica shell thicknesses of around 10, 25, and 80 nm were prepared. Europium complexes with benzoate (BA) in different proportions, 1, 10-phenanthroline (phen) and 2, 2'-bipyridine (bpy), were synthesized and characterized. The results suggest that the complexes have the formulas Eu(BA)_nCl_3-n ·2H₂O (n=1, 2, 3), Eu(phen)Cl₃ ·2H₂O, and Eu(bpy)Cl₃ ·2H₂O. The luminescence spectra of the complexes showed that adding Ag@SiO₂ nanoparticles increased the fluorescence intensity. The fluorescence enhancement sequence of the different silica shell thickness Ag@SiO₂ nanoparticles was 25 nm> 80 nm>10 nm, which showed that the local surface plasmon resonance was strongest at the silica shell thickness of about 25 nm. Furthermore, the enhancement effect for the Eu(phen)Cl₃·2H₂O complex was the strongest and that for the benzoic complex Eu(BA)_nCl_3-n·2H₂O was the weakest in these complexes. For the three benzoic complexes, the enhancement effect of Eu(BA)₃·2H₂O was the lowest. The nitrogenous complexes (Eu(phen)Cl₃ and Eu(bpy)Cl₃) could combine withAg@SiO₂ nanoparticles very well, while the interaction of Eu(BA)₃· 2H₂O with Ag@SiO₂ nanoparticles was weaker. Ag@SiO₂ nanoparticles are expected to enhance luminescence of rare earth materials.

Key words: Europium complex, Plasmon resonance, Ag@SiO₂ nanoparticle, Luminescence intensity, Core-shell structure

李晶晶, 栗源, 王爱玲, 屈燕荣, 岳彬, 周丹, 褚海斌, 赵永亮. 纳米Ag@SiO₂核壳结构的表面等离子体共振效应对铕配合物的荧光增强作用[J]. 物理化学学报, 2014, 30(12): 2328-2334.

LI Jing-Jing, LI Yuan, WANG Ai-Ling, QU Yan-Rong, YUE Bin, ZHOU Dan, CHU Hai-Bin, ZHAO Yong-Liang. Surface Plasmon Resonance Enhanced Luminescence of Europium Complexes with Ag@SiO₂ Core-Shell Structure[J]. Acta Phys. -Chim. Sin., 2014, 30(12): 2328-2334.

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201409292

https://www.whxb.pku.edu.cn/CN/Y2014/V30/I12/2328

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纳米Ag@SiO₂核壳结构的表面等离子体共振效应对铕配合物的荧光增强作用

Surface Plasmon Resonance Enhanced Luminescence of Europium Complexes with Ag@SiO₂ Core-Shell Structure

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