Fluorescence Enhancement of Dysprosium Complex by Binding to Silver Nanoparticles
Fluorescence Enhancement of Dysprosium Complex by Binding to Silver Nanoparticles
复制标题
通过与银纳米颗粒结合增强镝络合物的荧光
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Wang Ting
中科院分区：
文献类型：
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作者：
Wang Yue-Hui;Zhou Ji;Wang Ting
研究了不同粒径银纳米粒子存在下镝配合物（四乙酸乙二胺）的光致发光性能。在pH值为4.0~6.0的复合溶液中加入银纳米粒子，在较长波长区域形成了新的吸收带和纳米聚集体。随着银纳米粒子浓度的增加，长波峰发生红移，同时观察到含银纳米粒子的络合溶液的发射强度增强。配合物的荧光增强程度和增强因子与银纳米颗粒的浓度和大小有关。随着银纳米颗粒浓度的增加，增强因子先增大后减小。小银纳米粒子的增强因子低于大银纳米粒子，同时小银纳米粒子的增强因子在低银量条件下达到最大值。从纳米粒子聚集体效应、局部电磁场增强效应和表面等离激元共振引起的光吸收等方面讨论了增强效应。
The photoluminescent properties of dysprosium complex (ethylenediamine tetra acetate) were investigated in the presence of different sized Ag nanoparticles. The formation of nanoparticles aggregates and a new absorption band at longer wavelength region were observed upon the addition of Ag nanoparticles when the pH value of the complex solution was 4.0~6.0. With the increase of the concentration of Ag nanoparticles, the peak at long wavelength was red-shifted, at the same time, enhancement of the emission intensity for the complex solution containing Ag nanoparticles was observed. The enhanced fluorescence of the complex and the enhancement factors were dependent on the concentration and size of Ag nanoparticles. With increasing Ag nanoparticles concentration enhancement factor first increases and then decreases. The enhancement factor of small Ag nanoparticles is lower than that of large Ag nanoparticles, meanwhile, the enhancement factor of small Ag nanoparticles can reach the maximum in lower Ag amount condition. The enhancement effect was discussed in terms of the effects of nanoparticle aggregates, the local electromagnetic field enhancement effect and optical absorption due to surface plasmon resonance.