Laban B.B.,Science University of Pristina |
Vodnik V.,University of Belgrade |
Vujacic A.,University of Belgrade |
Sovilj S.P.,University of Belgrade |
And 2 more authors.
Russian Journal of Physical Chemistry A | Year: 2013
The aim of this work was to investigate the formation of J-aggregates of thiacyanine dye (TC, 5,5′-disulfopropyl-3,3′-dichlorothiacyanine sodium salt) in the presence of 6 nm spherical silver nanoparticles (Ag NPs) using spectrophotometric and fluorescence methods. The formation of J-aggregates was concentration dependent and characterized by the appearance of the new absorption band with the maximum at 481 nm. Spectrophotometric study of J-aggregate formation and time stability suggested that they were formed on the account of monomer form of TC. Moreover, the stability of J-aggregates increased with the lowering AgNPs concentration. The measurements of fluorescence of the NPs - dye assembly clearly indicated that the fluorescence of TC was quenched by Ag NPs on the concentration dependent manner. The spectrophotometric and fluorescence properties of NPs - dye assembly were found to be quantitatively related to the surface coverage of the dye on the Ag NPs. © 2013 Pleiades Publishing, Ltd.