物理化学学报 >> 2012, Vol. 28 >> Issue (06): 1313-1319.doi: 10.3866/PKU.WHXB201203292

热力学,动力学和结构化学 上一篇    下一篇

不同电性的纳米银对甲基橙光谱学性质的影响

王悦辉1, 沈建红2   

  1. 1. 电子科技大学中山学院化学与生物系, 广东中山 528402;
    2. 河南工业大学材料科学与工程学院, 郑州 450001
  • 收稿日期:2012-02-07 修回日期:2012-03-28 发布日期:2012-05-17
  • 通讯作者: 王悦辉 E-mail:wangzsedu@126.com
  • 基金资助:

    国家自然科学基金(50272032), 广东省自然科学基金(7300212), 电子科技大学中山学院科研启动基金(407YKQ06)和河南工业大学博士基金(150060)资助项目

Effects of Silver Nanoparticles with Different Electrical Properties on the Spectroscopic Properties of Methyl Orange

WANG Yue-Hui1, SHEN Jian-Hong2   

  1. 1. Department of Chemistry and Biology, University of Electronic Science and Technology of China Zhongshan Institute, Zhongshan 528402, Guangdong Province, P. R. China;
    2. School of Materials Science and Engineering, Henan University of Technology, Zhengzhou 450001, P. R. China
  • Received:2012-02-07 Revised:2012-03-28 Published:2012-05-17
  • Contact: WANG Yue-Hui E-mail:wangzsedu@126.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50272032), Natural Science Foundation of Guangdong Province, China (7300212), Scientific Research Initial Foundation of University of Electronic Science and Technology of China Zhongshan Institute, China (407YKQ06), and Doctor Foundation of Henan University of Technology, China (150060).

摘要: 通过吸收光谱和荧光光谱等手段研究了正/负电性纳米银对不同pH值的甲基橙(MO)溶液光谱学性质的影响. 研究结果表明, 正电性纳米银(P-Ag)与甲基橙作用形成新的复合物, 吸收光谱表现为复合物体系的性质. 负电性纳米银(N-Ag)与甲基橙静电排斥作用, 相互作用较弱, 吸收光谱仅表现为两者简单叠加. 在正电性纳米银-甲基橙体系中, S1S0荧光明显增强. 当溶液pH=2.1时, 荧光增强比率最大, 当pH=4.8时, 荧光增强比率最小; S2S0荧光减弱, 且与体系的pH值关系不大. 在负电性纳米银-甲基橙体系中, 仅少量纳米银存在条件下, S1S0荧光略增强. 在溶液pH=2.1 时, 荧光增强比率最大; S2S0荧光明显减弱, 且与体系的pH值关系不大. 分析认为, 不同电性的纳米银对甲基橙光谱学性质影响不同, 与纳米银与甲基橙分子间相互作用、纳米银的局域场增强效应以及无辐射能量转移作用等密切相关.

关键词: 纳米银, 甲基橙, 局域场增强, 荧光增强, 电性

Abstract: The effects of positive/negative silver nanoparticles on the spectroscopic properties of methyl orange (MO) in solution at different pH values were studied by UV-visible (UV-Vis) absorption spectroscopy and fluorometry. New complexes were formed by the strong electrostatic interaction between positive silver nanoparticles (P-Ag) and the MO so that UV-Vis absorption spectra showed the performance of the complexes. However, the UV-Vis absorption spectra only showed superposition of component peaks after addition of negative silver nanoparticles (N-Ag) to MO solution because of the weak interaction between N-Ag and MO induced by electrostatic repulsion. S1S0 was significantly enhanced in the MO solution containing P-Ag. The largest and smallest fluorescence enhancement ratios were observed at pH 2.1 and 4.8, respectively. The fluorescence intensity of S2S0 decreased and was almost independent of pH. Similar trends were observed for the MO solution containing N-Ag, except that the intensity of S1S0 was slightly enhanced in the presence of a small amount of N-Ag. The effects of silver nanoparticles with different electrical properties on the spectroscopic properties of MO depend on the interaction between MO and the silver nanoparticles as well as local field enhancement and non-radiative energy transfer.

Key words: Silver nanoparticle, Methyl orange, Local field enhancement, Fluorescence enhancement, Electrical property

MSC2000: 

  • O641