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Bimetallic copper palladium nanorods: plasmonic properties and palladium content effects.

Accepted version
Peer-reviewed

Type

Article

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Abstract

Cu is an inexpensive alternative plasmonic metal with optical behaviour comparable to Au but with much poorer environmental stability. Alloying with a more stable metal can improve stability and add functionality, with potential effects on the plasmonic properties. Here we investigate the plasmonic behaviour of Cu nanorods and Cu-CuPd nanorods containing up to 46 mass percent Pd. Monochromated scanning transmission electron microscopy electron energy-loss spectroscopy first reveals the strong length dependence of multiple plasmonic modes in Cu nanorods, where the plasmon peaks redshift and narrow with increasing length. Next, we observe an increased damping (and increased linewidth) with increasing Pd content, accompanied by minimal frequency shift. These results are corroborated by and expanded upon with numerical simulations using the electron-driven discrete dipole approximation. This study indicates that adding Pd to nanostructures of Cu is a promising method to expand the scope of their plasmonic applications.

Description

Keywords

40 Engineering, 4018 Nanotechnology

Journal Title

Nanoscale Adv

Conference Name

Journal ISSN

2516-0230
2516-0230

Volume Title

Publisher

The Royal Society of Chemistry
Sponsorship
EPSRC (EP/W015986/1)
Royal Society (NIF\R1\211474)
Engineering and Physical Sciences Research Council (EP/L015978/1)
European Research Council (804523)