Journal of Fluorescence

, Volume 17, Issue 4, pp 377–382 | Cite as

Fluorescence Modulation of Acridine and Coumarin Dyes by Silver Nanoparticles

  • Carolina A. Sabatini
  • Robson V. Pereira
  • Marcelo H. Gehlen
Original Paper

Abstract

Silver nanoparticles were synthesized by chemical reduction of silver ions by sodium borohydride in the presence of poly-(N)-vinyl-2-pyrrolidone in solution of short chain alcohols. The nanoparticles are stable in 2-propanol, and the average diameter of the Ag colloid obtained in this solvent is about 6 nm. The photophysical properties of acridinium and coumarin dyes in 2-propanol are affected by the presence of silver nanoparticles. The interaction of silver nanoparticles with acridinium derivative leads to a spectral change of its intramolecular charge transfer (ICT) absorption band. The dye emission increases suddenly with the initial addition of the Ag metal nanoparticles, but at a high concentration of the colloid, static fluorescence quenching occurs with a progressive decrease of the fluorescence efficiency. Amino coumarin fluorescence is only quenched by the silver nanoparticles in solution.

Keywords

Silver nanoparticles Dyes Fluorescence Plasmon resonance ICT 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Carolina A. Sabatini
    • 1
  • Robson V. Pereira
    • 1
  • Marcelo H. Gehlen
    • 1
  1. 1.Instituto de Química de São CarlosUniversidade de São PauloSão CarlosBrazil

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