Resonances of Nanoparticles with Poor Plasmonic Metal Tips

Overview

Journal Sci Rep

Specialty Science

Date 2015 Dec 1

PMID 26617270

Citations 8

Authors

Emilie Ringe

Christopher J DeSantis

Sean M Collins

Martial Duchamp

Rafal E Dunin-Borkowski

Sara E Skrabalak

Paul A Midgley

Affiliations

Soon will be listed here.

Abstract

The catalytic and optical properties of metal nanoparticles can be combined to create platforms for light-driven chemical energy storage and enhanced in-situ reaction monitoring. However, the heavily damped plasmon resonances of many catalytically active metals (e.g. Pt, Pd) prevent this dual functionality in pure nanostructures. The addition of catalytic metals at the surface of efficient plasmonic particles thus presents a unique opportunity if the resonances can be conserved after coating. Here, nanometer resolution electron-based techniques (electron energy loss, cathodoluminescence, and energy dispersive X-ray spectroscopy) are used to show that Au particles incorporating a catalytically active but heavily damped metal, Pd, sustain multiple size-dependent localized surface plasmon resonances (LSPRs) that are narrow and strongly localized at the Pd-rich tips. The resonances also couple with a dielectric substrate and other nanoparticles, establishing that the full range of plasmonic behavior is observed in these multifunctional nanostructures despite the presence of Pd.

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