%A WANG Yue-hui;XIONG Na-na;ZHOU Ji %T Fluorescence Enhancement Effect of Silver Nanoparticles with Different Surface Modifiers and Sizes %0 Journal Article %D 2014 %J SPECTROSCOPY AND SPECTRAL ANALYSIS %R 10.3964/j.issn.1000-0593(2014)12-3292-05 %P 3292-3296 %V 34 %N 12 %U {https://www.gpxygpfx.com/CN/abstract/article_7402.shtml} %8 2014-12-01 %X Silver nanoparticles were prepared by chemical method using citricacid trisodiumsalt (Ag-CTS) and polyvinylpyrrolidone (Ag-PVP) as surface modifiers, respectively. When Ag-CTS or Ag-PVP nanoparticles were added into methyl orange (MO) solution, the enhanced-fluorescence of S1S0 and quenched-fluorescence of S2S0 were simultaneously observed. However, for the solution containing Ag-PVP, the red-shift of fluorescence peak of S1S0 was observed and the extents of the enhanced-fluorescence of S1S0 and quenched-fluorescence of S2S0 are higher than those of the solution containing Ag-CTS. With the increase in reaction time the fluorescence intensity of S1S0 increased gradually in the solution containing Ag-CTS nanoparticles and no change was observed in the solution containing Ag-PVP nanoparticles. The lower the MO concentration, the higher the fluorescence intensity ratio of S1S0. The results indicated that the silver nanoparticles with different surface modifiers affect the metal-enhanced fluorescence by impacting the distance between the methyl orange and silver nanoparticles. The size of silver nanoparticles affects the metal-enhanced fluorescence due to the difference in the surface plasma resonance properties.