Abstract
While nanoparticle plasmonic coupling is known to be responsible for the enhancement of the local electrical field that determines optical or spectroscopic properties, understanding of the structural details of the interparticle interactions remains elusive. This report describes findings of an investigation of plasmonic coupling of gold nanoparticles via J-aggregation of cyanine dyes to define the interparticle interaction. The adsorption of two cyanine dye molecules with subtle differences in structures on gold nanoparticles of different sizes and their resulting interparticle π–π interactions, or J-aggregation, were examined to assess the interparticle-interaction-induced changes of spectroscopic properties, surface plasmon resonance absorption, and surface-enhanced Raman scattering. The results demonstrate that these two spectroscopic properties work in concert with plasmonic coupling in the kinetic process, as evidenced by the comparable apparent rate constants determined in terms of nanoparticle dim...
Published Version
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