Issue 23, 2023

Bimetallic copper palladium nanorods: plasmonic properties and palladium content effects

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.

Graphical abstract: Bimetallic copper palladium nanorods: plasmonic properties and palladium content effects

Supplementary files

Article information

Article type
Paper
Submitted
13 jul 2023
Accepted
24 out 2023
First published
24 out 2023
This article is Open Access
Creative Commons BY license

Nanoscale Adv., 2023,5, 6524-6532

Bimetallic copper palladium nanorods: plasmonic properties and palladium content effects

A. Ten, C. A. West, S. Jeong, E. R. Hopper, Y. Wang, B. Zhu, Q. M. Ramasse, X. Ye and E. Ringe, Nanoscale Adv., 2023, 5, 6524 DOI: 10.1039/D3NA00523B

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