Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 19, Issue 22, Pages 14471-14477Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cp00884h
Keywords
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Funding
- National Science Foundation Award [CHE-1507550, CHE-1507646]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1507550] Funding Source: National Science Foundation
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We examined the electronic relaxation dynamics for mono and bimetallic Au144-xAgx(SC8H9)(60) monolayer-protected clusters (MPCs) using femtosecond time-resolved transient extinction spectroscopy. MPCs provide compositionally well-defined model systems for structure-specific determination of nanoscale electronic properties. Based on pulse-energy-dependent transient extinction data, we quantified electron-phonon coupling constants for three distinct Au144-xAgx(SC8H9)(60) MPC samples, where x = 0, 0 < x < 30, and x similar to 30, as G(x=0) = (1.61 +/- 0.1) x 10(16) W m(-3) K-1, G(x<30) = (1.74 +/- 0.1) x 10(16) W m(-3) K-1 and G(x similar to 30) = (2.07 +/- 0.15) x 10(16) W m(-3) K-1, respectively. These results reflect a trend of greater electron-phonon coupling efficiency with increasing silver content. Based on these data, we conclude that gold-atom replacement by silver occurs at surface sites of the 114-atom metal core of the MPC. Definitive determinations of functional response to nanoscale alloy'' formation and dopant inclusion are critical to establishing predictive models for the development of materials that feature nanoparticles as active components.
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