Titre :Combining Plasmonic and Catalytic Metals for Functional Nanomaterials

Endroit : Pavillon J.-Armand Bombardier, salle 1035 à 14 hHôte : Jean-François Masson

Cette conférence sera prononcée (en anglais) par la Professeure Emilie Ringe du Department of Materials Science and NanoEngineering de l'Université Rice.

Résumé: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 or close to the surface of efficient plasmonic particles thus presents a unique opportunity if the resonances can be conserved after coating.

Here, electron-based techniques (electron-energy loss, cathodoluminescence, and energy dispersive X-ray spectroscopy) are used to characterize bimetallic systems such as Au/Pd octopods, Pt-decorated Au prisms, and Pd-decorate Al nanocrystals. We show that these plasmonic nanomaterials incorporating catalytically active but heavily damped metals sustain multiple size-dependent LSPRs that are strongly localized at the particle tips or edges, depending on the mode energy. Tomography and composition mapping unravels the availability of catalytic metal at the surface of the nanoparticles, and catalytic studies unravel their potential as light-enhanced catalysts.

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