Long-lived charge-separated states in ligand-stabilized silver clusters

Matthew Pelton, Yun Tang, Osman M. Bakr, Francesco Stellacci

Research output: Contribution to journalArticlepeer-review

Abstract

Recently developed synthesis methods allow for the production of atomically monodisperse clusters of silver atoms stabilized in solution by aromatic thiol ligands, which exhibit intense absorption peaks throughout the visible and near-IR spectral regions. Here we investigated the time-dependent optical properties of these clusters. We observed two kinetic processes following ultrafast laser excitation of any of the absorption peaks: a rapid decay, with a time constant of 1 ps or less, and a slow decay, with a time constant that can be longer than 300 ns. Both time constants decrease as the polarity of the solvent increases, indicating that the two processes correspond to the formation and recombination, respectively, of a charge-separated state. The long lifetime of this state and the broad optical absorption spectrum mean that the ligand-stabilized silver clusters are promising materials for solar energy harvesting.

Original languageEnglish
Pages (from-to)11856-11859
Number of pages4
JournalJournal of the American Chemical Society
Volume134
Issue number29
DOIs
Publication statusPublished - Jul 25 2012

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

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