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Time-dependent emission stokes shift in Au, Ag and Au/Ag fluorescent nanoclusters: Evidence of multiple emissive states
Published in Royal Society of Chemistry
Volume: 18
Issue: 7
Pages: 1782 - 1792
Au, Ag and bimetallic Au/Ag nanoclusters were prepared under similar microwave-irradiated synthesis conditions in aqueous solutions, using BSA as a stabilizer. The nanoclusters exhibited strong fluorescence with characteristic emission spectral peak features that suggested the presence of multiple emissive states in each case. Time-resolved emission studies revealed the very rare incidence of the time-dependent emission Stokes shift in metal nanoclusters over a time-scale of ∼10 ns. The shifts were of varying degrees: ∼200 cm-1 for Ag, ∼750 cm-1 for Au and ∼1400 cm-1 for Au/Ag nanoclusters. Application of the Time-Resolved Area Normalized Emission Spectra (TRANES) method confirmed the existence of multiple emissive species in each of the nanoclusters, which also helped to explain the time-dependent emission Stokes shift. © 2019 The Royal Society of Chemistry and Owner Societies.
About the journal
JournalData powered by TypesetPhotochemical and Photobiological Sciences
PublisherData powered by TypesetRoyal Society of Chemistry