Variations in steady-state and time-resolved background luminescence from surface-enhanced resonance raman scattering-active single Ag nanoaggregates

摘要: We observed a background luminescence emission that was associated with surface-enhanced resonance Raman scattering (SERRS) of rhodamine 6G (R6G) molecules adsorbed on single Ag nanoaggregates and investigated the origin luminescence. Thanks to observation nanoaggregates, we clearly identified nanoaggregate-by-nanoaggregate variations in steady-state time-resolved spectra each nanoaggregate. From spectra, two kinds key properties were revealed. First, divided into four components: one fluorescence band corresponding monomers R6G three Lorentzian bands whose maxima red-shifted from maximum monomer by several tens nanometers. On basis maxima, experimental theoretical studies luminescence, attributed luminescences aggregates (dimer higher-order aggregates) an surface. Second, positive correlation between wavelengths plasmon maxima. This invoked idea dipoles both radiation are coupled other. observations propose factors contribute spectra; is aggregation (monomer, dimer, surface, other nanoaggregates. Considering these factors, deaggregation (higher- lower-order temporal shifts