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Plasmon Mapping in Au@Ag Nanocube Assemblies.

Bart Goris1, Giulio Guzzinati1, Cristina Fernández-López2

  • 1EMAT, University of Antwerp , Groenenborgerlaan 171, 2020 Antwerp, Belgium.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
|July 29, 2014
PubMed
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Metallic nanostructures exhibit surface plasmon modes crucial for optoelectronic properties. Organized arrays of gold-silver core-shell nanocubes create antenna effects, enhancing electrical fields in narrow gaps.

Area of Science:

  • Plasmonics and Nanophotonics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Surface plasmon modes in metallic nanostructures govern optoelectronic properties.
  • Plasmonic behavior is tunable via nanoparticle morphology and assembly.
  • Understanding plasmon hybridization is key to designing advanced nanostructures.

Purpose of the Study:

  • To investigate surface plasmon modes in various silver and gold-silver nanostructures.
  • To explore plasmon hybridization in organized arrays of nanocubes.
  • To demonstrate the antenna effect in nanotriangular assemblies for field enhancement.

Main Methods:

  • Electron Energy Loss Spectroscopy (EELS) mapping was employed.
  • Characterization of pure silver nanocubes, Au@Ag core-shell nanocubes, and their arrays.

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  • Analysis of plasmon modes, focusing on triangular arrays of nanocubes.

    • Main Results:

    • EELS successfully mapped plasmon modes in individual and assembled nanocubes.
    • Ordered arrays of Au@Ag nanocubes exhibit tunable plasmonic structures.
    • Hybridization in nanotriangular arrays leads to significant electrical field enhancement.

    Conclusions:

    • Organized plasmonic nanostructures can be engineered from basic building blocks.
    • Nanocube assemblies, particularly triangular arrays, demonstrate a pronounced antenna effect.
    • This work provides insights into tailoring plasmonic properties for enhanced optical functionalities.