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研究了不同粒径的纳米银对镝配合物(乙二胺四乙酸配合物)的光谱学性质影响。当配合物溶液的pH值范围为4.0～6.0时,加入纳米银,可观察到大量的纳米银聚集体形成,而在吸收光谱的长波处出现一个新的吸收峰,随着纳米银浓度的增加,该吸收峰逐渐红移,同时,镝配合物的荧光强度增强。实验结果表明,纳米银粒子对镝配合物的荧光增强效应及荧光增强因子与纳米银粒子的浓度和粒径密切相关。随着纳米银浓度的增加,配合物的荧光强度先增强而后又逐渐降低。小粒径的纳米银对镝配合物的荧光增强因子较小。本文从纳米银粒子的聚集效应、局部电磁场增强效应及光吸收效应等方面探讨了纳米银对表面吸附镝配合物的+荧光增强效应机理。
The effects of different sizes of silver nanoparticles on the spectroscopic properties of the dysprosium complex (ethylenediaminetetraacetic acid complex) were studied. When the pH value of the complex solution is in the range of 4.0-6.0, a large amount of nano-silver aggregates can be observed when nano-silver is added, and a new absorption peak appears at the long wavelength of the absorption spectrum. With the increase of nano-silver concentration , The absorption peak gradually redshifts, meanwhile, the fluorescence intensity of dysprosium complex is enhanced. The experimental results show that the fluorescence enhancement effect of the silver nanoparticles on the dysprosium complex and the fluorescence enhancement factor are closely related to the concentration and particle size of the silver nanoparticles. With the increase of nano-silver concentration, the fluorescence intensity of the complex first increased and then decreased gradually. Small size of silver nanoparticles on the dysprosium complexes fluorescence enhancement factor smaller. In this paper, the effects of nanosilver on the fluorescence enhancement of the surface-adsorbed Dysprosium complexes were discussed in terms of the aggregation effect of nano-silver particles, the enhancement effect of local electromagnetic field and the light absorption effect.