Realizing visible photoactivity of metal nanoparticles: Excited-state behavior and electron-transfer properties of silver (Ag 8) clusters

Wei Ta Chen, Yung-Jung Hsu, Prashant V. Kamat*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

Silver nanoclusters complexed with dihydrolipoic acid (DHLA) exhibit molecular-like excited-state properties with well-defined absorption and emission features. The 1.8 nm diameter Ag nanoparticles capped with Ag 8 clusters exhibit fluorescence maximum at 660 nm with a quantum yield of 0.07%. Although the excited state is relatively short-lived (τ 130 ps), it exhibits significant photochemical reactivity. By introducing MV 2+ as a probe, we have succeeded in elucidating the interfacial electron transfer dynamics of Ag nanoclusters. The formation of MV +• as the electron-transfer product with a rate constant of 2.74 × 10 10 s -1 confirms the ability of these metal clusters to participate in the photocatalytic reduction process. Basic understanding of excited-state processes in fluorescent metal clusters paves the way toward the development of biological probes, sensors, and catalysts in energy conversion devices.

Original languageEnglish
Pages (from-to)2493-2499
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume3
Issue number17
DOIs
StatePublished - 6 Sep 2012

Fingerprint Dive into the research topics of 'Realizing visible photoactivity of metal nanoparticles: Excited-state behavior and electron-transfer properties of silver (Ag <sub>8</sub>) clusters'. Together they form a unique fingerprint.

Cite this