Optical Property–Composition Correlation in Noble Metal Alloy Nanoparticles Studied with EELS
Journal article, 2019

Noble metals are currently the most common building blocks in plasmonics and thus define the available range of optical properties. Their alloying provides a viable strategy to engineer new materials with a tunable range of optical responses. Despite this attractive prospect, the link between composition and optical properties of many noble metal alloys is still not well understood. Here, electron energy-loss spectroscopy is employed to systematically study AuAg and AuPd nanoparticles of varying compositions. The localized surface plasmons, the bulk plasmons, and the permittivity functions of these two sets of alloys are investigated as functions of their composition. In the case of the more widely studied AuAg alloy system, good agreement is found with previous experimental and theoretical studies. The results on the less scrutinized AuPd system provide highly valuable experimental data that complements other experimental investigations and supports the development of theoretical models.

alloys

electron energy-loss spectroscopy

permittivity function

optical properties

plasmonics

localized surface plasmons

nanoparticles

Author

Shima Kadkhodazadeh

Technical University of Denmark (DTU)

Ferry Nugroho

Chalmers, Physics, Chemical Physics

Christoph Langhammer

Chalmers, Physics, Chemical Physics

Marco Beleggia

Technical University of Denmark (DTU)

Jakob B. Wagner

Technical University of Denmark (DTU)

ACS Photonics

2330-4022 (eISSN)

Vol. 6 3 779-786

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Nano Technology

DOI

10.1021/acsphotonics.8b01791

More information

Latest update

5/7/2019 1