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Optical Response Tailoring via Morphosynthesis of Ag@Au Nanoparticles
David Oswaldo Romero-Quitl1, Siva Kumar Krishnan2, Martha Alicia Palomino-Ovando1
1Facultad de Ciencias Físico-Matemáticas, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y Av. 18 Sur, Col. San Manuel, Ciudad Universitaria, Puebla Pue 72570, Mexico.
Nanomaterials (Basel, Switzerland)
|July 25, 2025
Summary
Researchers developed a simple method to control gold-core, silver-shell (Au@Ag) nanoparticle shape and silver shell thickness. This allows tuning of plasmonic properties for advanced applications in sensing and photonics.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- Gold-core, silver-shell (Au@Ag) nanoparticles exhibit tunable plasmonic properties.
- Controlling nanoparticle morphology is crucial for optimizing optical characteristics.
- Existing methods for Au@Ag nanoparticle synthesis may lack precise control over shell thickness and shape.
Purpose of the Study:
- To present a straightforward method for customizing the optical properties of Au@Ag nanoparticles.
- To demonstrate control over silver shell thickness and nanoparticle shape (spheres to nanocubes).
- To correlate synthesized nanostructures' morphology with their plasmonic behavior.
Main Methods:
- Seed-mediated chemical reduction approach for Au@Ag nanoparticle synthesis.
- Systematic variation of cetyltrimethylammonium chloride (CTAC) concentration.
- Characterization using bright-field and high-angle annular dark-field scanning transmission electron microscopy (BF-STEM and HAADF-STEM).
- Compositional analysis via energy-dispersive X-ray spectroscopy (EDS).
- Theoretical simulation using Mie and Maxwell-Garnett models.
Main Results:
- Achieved precise control over silver shell thickness and Au@Ag nanoparticle morphology.
- Successfully transitioned nanoparticle shape from spheres to well-defined nanocubes by adjusting CTAC concentration.
- Experimental UV-visible absorption spectra aligned with theoretical simulations of dielectric response.
- Demonstrated a direct link between nanoparticle shape/shell thickness and plasmonic properties.
Conclusions:
- A simple and adjustable method for morphosynthesis of Au@Ag nanoparticles was established.
- The method allows for fine-tuning of plasmonic properties by controlling nanoparticle shape and shell.
- This offers significant potential for applications in sensing, photonics, and nanophotonics.
