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Writing and Low-Temperature Characterization of Oxide Nanostructures
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Layer-by-layer processing and optical properties of core/alloy nanostructures.

Peter N Njoki1, Wenjie Wu, Hui Zhao

  • 1Department of Chemistry, Syracuse University, Syracuse, New York 13244, USA.

Journal of the American Chemical Society
|March 25, 2011
PubMed
Summary

A new hydrothermal method fabricates core/alloy nanoparticles with tunable surface plasmon resonance. Researchers precisely controlled alloy composition and thickness to tailor optical properties for advanced plasmonic applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Surface plasmon resonance (SPR) is crucial for various optical applications.
  • Fabricating nanoparticles with tunable SPR properties remains a challenge.
  • Controlling nanoparticle composition and morphology is key to tailoring SPR.

Purpose of the Study:

  • To introduce a novel hydrothermal layer-by-layer method for fabricating core/alloy nanoparticles.
  • To demonstrate the tunability of surface plasmon resonance (SPR) in these nanoparticles.
  • To correlate optical properties with nanoparticle structure and composition.

Main Methods:

  • Hydrothermal layer-by-layer processing for nanoparticle fabrication.
  • System model: Gold/Gold-Silver (Au/Au(x)Ag(1-x)) core/alloy nanoparticles.

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Last Updated: Jun 3, 2026

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  • Optical characterization using discrete dipole approximation (DDA).
  • Structural analysis via selective alloy etching.

    • Main Results:

    • Achieved highly tunable surface plasmon resonance (SPR) through controlled processing.
    • Demonstrated that processing temperature, alloy composition (Au(x)Ag(1-x)), and alloy thickness significantly impact SPR signatures.
    • Established a correlation between optical response, particle morphology, and alloy phase ultrastructure.

    Conclusions:

    • The developed hydrothermal method offers precise control over nanoparticle properties.
    • Tailorable plasmonic signatures can be achieved by manipulating alloy composition and thickness.
    • This technique provides a pathway for designing advanced plasmonic nanomaterials.