| 电解质对吸附于纳米银粒子表面荧光素的光谱学性质的影响 |
| Effects of Electrolytes on Fluorescent Properties of Fluorescein Binding on Surface of Silver Nanoparticles |
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| 摘要: 在含有纳米银的荧光素溶液(Fl-Ag)中引入KNO3、KCl、Ca(NO3)2和CaCl2电解质，利用透射电子显微镜、紫外-可见分光光度计和荧光分光光度计等技术研究电解质对Fl-Ag溶液的显微结构和光谱学性质的影响。结果表明，电解质离子与纳米银粒子间存在较强的相互作用，这种强的相互作用造成纳米银粒子不同程度的聚集和生长。各电解质引起的纳米银粒子的聚集程度关系为CaCl2＞Ca(NO3)2＞KCl＞KNO3。随着电解质加入量的增加，溶液的荧光强度先下降，而后又逐渐增强，直至达到定值。各电解质对Fl-Ag溶液的荧光强度影响强弱关系为Ca(NO3)2＞CaCl2＞KCl＞KNO3。本文从分子间的相互作用、能量传输等方面探讨了电解质离子对含有纳米银的荧光素溶液的显微结构和光学性能影响机理。 |
| 关键词: 纳米银 荧光素 电解质 局部表面等离子共振 局域场增强 荧光增强 |
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| Abstract: The effects of electrolytes, including KNO3, KCl, Ca(NO3)2 and CaCl2, on microstructure and fluorescent properties of the fluorescein (Fl) solution containing silver nanoparticles (Fl-Ag) were investigated by transmission electron microscopy and UV-Visible spectroscopy and spectrofluorophotometer. The results indicate that the stronger action among electrolyte ions and silver nanoparticle leads to the formation of large particles and aggregates in the solution. The effect order of electrolytes on the aggregates of silver nanoparticles is CaCl2＞Ca(NO3)2＞KCl＞KNO3. With the increasing of the electrolyte content, the fluorescence intensity decreases first and then increases until to the constant value. The dependence of electrolytes on the fluorescence intensity of the Fl-Ag solution follows the order of Ca(NO3)2＞CaCl2＞KCl＞KNO3. The effect of electrolytes on microstructure and fluorescent properties of the fluorescein solution containing silver nanoparticles is discussed in terms of the action among electrolytes and energy transfer. |
| Keywords: silver nanoparticle fluorescein electrolyte surface plasmon resonance local field enhancement enhanced fluorescence |
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| 王悦辉,周 济,王 婷.电解质对吸附于纳米银粒子表面荧光素的光谱学性质的影响[J].无机化学学报,2008,24(2):205-210. |
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