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Updated: Apr 28, 2026
15:06
Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
Published on: January 3, 2016
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Discrete dipole approximation analysis of plasmonic core/alloy nanoparticles
1Department of Chemistry, Syracuse University, 111 College Place, Syracuse, New York 13244 (USA).
Summary
Researchers tuned the surface plasmon resonance (SPR) of gold/gold-silver alloy nanoparticles by altering alloy composition and dimensions. This tuning impacts SPR shape, frequency, and extinction for novel optical properties.
Area of Science:
- Nanotechnology
- Materials Science
- Physical Chemistry
Background:
- Surface Plasmon Resonance (SPR) is a key phenomenon in nanoscience.
- Gold-silver alloy nanoparticles offer tunable optical properties.
- Controlling nanoparticle microstructure is crucial for optimizing SPR.
Purpose of the Study:
- Investigate the SPR properties of gold/gold-silver alloy core/shell nanoparticles.
- Explore the influence of microstructure on SPR characteristics.
- Compare theoretical models with experimental synthesis results.
Main Methods:
- Utilized the discrete dipole approximation (DDA) for theoretical modeling.
- Varied nanoparticle shell alloy composition (x), shell thickness (tS), and shell-to-core radius ratio (tS/rC).
- Employed microwave-mediated hydrothermal processing for nanoparticle synthesis.
Main Results:
- Achieved novel tuning of SPR shape, frequency, and extinction.
- Demonstrated control over SPR properties by adjusting microstructure parameters.
- Observed close resemblance between modeled and experimentally obtained SPR signatures.
Conclusions:
- The microstructure of Au/Au(x)Ag(1-x) core/alloy nanoparticles significantly influences SPR properties.
- Discrete dipole approximation provides an accurate model for predicting SPR behavior.
- Microwave-mediated hydrothermal processing is an effective method for synthesizing NPs with desired SPR characteristics.
Keywords:
core/alloy structuresdiscrete dipole approximationnanoparticlesstructure elucidationsurface plasmon resonanceMore Related Videos
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