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Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
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Tuning surface plasmons in interconnected hemispherical Au shells.

Peter Krohne-Nielsen1, Sergey M Novikov, Jonas Beermann

  • 1Institute of Technology and Innovation, University of Southern Denmark (SDU), Campusvej 55, DK-5230, Odense M, Denmark. pnie@iti.sdu.dk

Optics Express
|January 26, 2012
PubMed
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Researchers developed a new method to create tunable hemispherical shells. This technique enhances understanding of surface plasmon resonances (SPRs) by independently controlling shell thickness and optical properties.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Plasmonics

Background:

  • Film-On-Nanospheres (FONs) exhibit surface plasmon resonances (SPRs) where parameters like metal thickness and curvature are coupled.
  • Understanding these coupled parameters is crucial for controlling FON optical properties.

Purpose of the Study:

  • To develop a novel method for fabricating hemispherical shells with independently tunable metal thickness.
  • To decouple and investigate the influence of shell thickness on SPRs in FON structures.
  • To correlate optical measurements with electromagnetic field enhancements.

Main Methods:

  • Fabrication of hemispherical shells via stripping gold (Au) from anodized aluminum templates.
  • Adjusting metal thickness without altering outer radius, film roughness, or contact area sharpness.

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Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
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  • Linear reflection spectroscopy to measure SPRs.
  • Two-photon luminescence scanning optical microscopy to map electromagnetic hot spots.

    • Main Results:

    • Demonstrated wide tunability of SPR spectral positions by adjusting inner hemisphere diameter while maintaining a fixed outer diameter.
    • Isolated optical contributions from roughness and contact areas by depositing additional Au.
    • Correlated high field enhancements observed via luminescence microscopy with linear reflection spectroscopy data.

    Conclusions:

    • The developed method allows for precise control over hemispherical shell thickness, decoupling it from other geometric parameters.
    • This decoupling provides deeper insights into the factors governing SPRs in FON systems.
    • The findings enable tailored design of nanostructures for specific plasmonic applications.