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Updated: Jan 21, 2026
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Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation
Published on: August 15, 2019
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Electronic Structure-Dependent Surface Plasmon Resonance in Single Au-Fe Nanoalloys
Duncan T L Alexander1,2, Daniel Forrer3,4, Enrico Rossi4
1Electron Spectrometry and Microscopy Laboratory (LSME), Institute of Physics (IPHYS) , Ecole Polytechnique Fédérale de Lausanne (EPFL) , 1015 Lausanne , Switzerland.
Nano Letters
|July 27, 2019
Summary
We explored gold-iron (Au-Fe) nanoalloys, finding that increasing iron content shifts and dampens plasmon resonance. This impacts optical properties for applications in sensing and catalysis.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- The interplay between composition and plasmonic properties in noble metal nanoalloys remains under-explored.
- Gold-iron (Au-Fe) nanoalloys exhibit unique properties with potential applications in nanomedicine, magneto-plasmonics, and plasmon-enhanced catalysis.
Purpose of the Study:
- To investigate the localized surface plasmon resonance (LSPR) in single Au-Fe nanoparticles.
- To understand how varying iron composition affects the electronic structure and optical response of Au-Fe nanoalloys.
Main Methods:
- Combined experimental measurements using near-field electron energy loss spectroscopy (NF-EELS).
- Theoretical studies employing full-wave numerical analysis and density functional theory (DFT) calculations.
- Analysis of electronic band structure and free electron density.
Main Results:
- Increasing iron fraction in Au-Fe nanoparticles leads to a blue shift and significant damping of the plasmon resonance.
- Observed changes in electronic band structure, including new states near the Fermi level and altered free electron density.
- Identified blue shifts in interband transitions as a function of iron content.
Conclusions:
- The study reveals key phenomena influencing plasmonic nanoalloys: new electronic states, modified free electron density, and shifted interband transitions.
- Provides insights for controlling the optical response of Au-Fe and other plasmonic nanoalloys.
- Enables the development of advanced magneto-plasmonic devices for sensing, bioimaging, and catalysis.
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