物理化学学报 >> 2010, Vol. 26 >> Issue (06): 1607-1616.doi: 10.3866/PKU.WHXB20100539

光化学与光谱 上一篇    下一篇

纳米银粒子对[Ru(bpy)3]2+光谱学性质的影响及电解质效应

王悦辉, 王婷, 周济   

  1. 电子科技大学中山学院化学与生物系, 广东 中山 528402; 清华大学材料科学与工程系, 新型陶瓷与精细工艺国家重点实验室, 北京 100084; 北京有色金属研究总院, 北京 100088
  • 收稿日期:2009-11-09 修回日期:2010-02-22 发布日期:2010-05-28
  • 通讯作者: 王悦辉, 周济 E-mail:wangzsedu@126.com; Zhouji@tsinghua.edu.cn

Effect of Silver Nanoparticles on the Spectroscopy Properties of [Ru(bpy)3]2+ and Electrolyte Effect

WANG Yue-Hui, WANG Ting, ZHOU Ji   

  1. Department of Chemistry and Biology, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, Guangdong Province, P. R. China; State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China; Beijing General Research Institute for Nonferrous Metals, Beijing 100088, P. R. China
  • Received:2009-11-09 Revised:2010-02-22 Published:2010-05-28
  • Contact: WANG Yue-Hui, ZHOU Ji E-mail:wangzsedu@126.com; Zhouji@tsinghua.edu.cn

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摘要：

研究了[Ru(bpy)3]2+溶液中引入纳米银粒子的光谱学性质变化规律以及[Ru(bpy)3]2+与纳米银粒子所构成的溶液体系([Ru(bpy)3]2+-Ag)的电解质效应. 研究结果表明, [Ru(bpy)3]2+吸附在纳米银粒子表面使纳米银粒子相互桥连形成规则的类链状网络聚集体. 纳米银粒子造成[Ru(bpy)3]2+溶液荧光猝灭, 且大尺寸的纳米银粒子引起的荧光猝灭程度较大. 在[Ru(bpy)3]2+-Ag体系中引入电解质造成纳米银粒子不同程度的聚集和生长. 电解质对纳米银聚集影响为: CaCl2>MgCl2>Ca(NO3)2>KCl>KNO3. 随着[Ru(bpy)3]2+-Ag体系中引入电解质含量的增加, 溶液的荧光强度先降低而后又逐渐增强, 直至达到定值, 表明一定量的电解质可产生荧光猝灭释放效应. 电解质对荧光强度影响顺序为: Ca(NO3)2>CaCl2>MgCl2>KCl>KNO3. 采用透射电子显微镜、紫外-可见吸收分光光度计和荧光分光光度计等手段从分子间相互作用和能量传输等方面初步探讨了纳米银粒子对表面吸附[Ru(bpy)3]2+溶液光谱学性质的影响机制以及电解质效应.

关键词: 纳米银, [Ru(bpy)3]2+, 局部表面等离子体共振, 局域场增强, 荧光增强, 荧光猝灭, 电解质

Abstract:

The effects of silver nanoparticles on the fluorescence properties of a [Ru(bpy)3]2+ complex bound to the surface of silver nanoparticles and an electrolyte effect were studied in this paper. Chain-like nanoparticle aggregates were formed due to bridging of [Ru(bpy)3]2+ on the surface of the silver nanoparticles. The fluorescence intensity of the [Ru(bpy)3]2+ complex was quenched and the larger size silver nanoparticles were found to be more efficient quenchers. The electrolyte ions allow the formation of large silver nanoparticles and aggregates in solution. The effect of electrolytes on the aggregates of silver nanoparticles decreases in the order: CaCl2>MgCl2>Ca(NO3)2>KCl>KNO3. As the electrolyte content increases, the fluorescence intensity initially decreases and then increases until it reaches a constant value. These results indicate that the electrolytes decrease the quenching effect. The effect of electrolytes on the fluorescence intensity of the [Ru(bpy)3]2+-Ag solution decreases as follows: Ca(NO3)2>CaCl2>MgCl2>KCl>KNO3. The effects of these electrolytes on the microstructure and fluorescence properties of the [Ru(bpy)3]2+ solution containing silver nanoparticles are discussed in terms of the interaction among the electrolytes and the energy transfer is investigated by transmission electron microscopy, UV-visible spectroscopy, and spectrofluorophotometry.

Key words: Silver nanoparticle, [Ru(bpy)3]2+, Localized surface plasmons resonance, Local field enhancement, Enhanced fluorescence, Quenched fluorescence, Electrolyte