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

Handle URI:
http://hdl.handle.net/10754/562247
Title:
Long-lived charge-separated states in ligand-stabilized silver clusters
Authors:
Pelton, Matthew; Tang, Yun; Bakr, Osman M. ( 0000-0002-3428-1002 ) ; Stellacci, Francesco
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. © 2012 American Chemical Society.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program; Solar and Photovoltaic Engineering Research Center (SPERC); Functional Nanomaterials Lab (FuNL)
Publisher:
American Chemical Society
Journal:
Journal of the American Chemical Society
Issue Date:
25-Jul-2012
DOI:
10.1021/ja303682m
Type:
Article
ISSN:
00027863
Sponsors:
We thank A. Demortiere for assistance with freeze-pump-thaw preparation and D. Gosztola and G. Wiederrecht for helpful discussions. Work at the Center for Nanoscale Materials was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract DE-AC02-06CH11357.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program; Solar and Photovoltaic Engineering Research Center (SPERC)

Full metadata record

DC FieldValue Language
dc.contributor.authorPelton, Matthewen
dc.contributor.authorTang, Yunen
dc.contributor.authorBakr, Osman M.en
dc.contributor.authorStellacci, Francescoen
dc.date.accessioned2015-08-03T09:57:55Zen
dc.date.available2015-08-03T09:57:55Zen
dc.date.issued2012-07-25en
dc.identifier.issn00027863en
dc.identifier.doi10.1021/ja303682men
dc.identifier.urihttp://hdl.handle.net/10754/562247en
dc.description.abstractRecently 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. © 2012 American Chemical Society.en
dc.description.sponsorshipWe thank A. Demortiere for assistance with freeze-pump-thaw preparation and D. Gosztola and G. Wiederrecht for helpful discussions. Work at the Center for Nanoscale Materials was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract DE-AC02-06CH11357.en
dc.publisherAmerican Chemical Societyen
dc.titleLong-lived charge-separated states in ligand-stabilized silver clustersen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.contributor.departmentSolar and Photovoltaic Engineering Research Center (SPERC)en
dc.contributor.departmentFunctional Nanomaterials Lab (FuNL)en
dc.identifier.journalJournal of the American Chemical Societyen
dc.contributor.institutionCenter for Nanoscale Materials, Argonne National Laboratory, Argonne, IL 60439, United Statesen
dc.contributor.institutionInstitute of Materials, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerlanden
kaust.authorBakr, Osman M.en
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