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Updated: Jun 25, 2026

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
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Computational and experimental evaluation of nanoparticle coupling.

Kevin L Shuford1, Kent A Meyer, Cuncheng Li

  • 1Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.

The Journal of Physical Chemistry. A
|February 13, 2009
PubMed
Summary
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We studied gold nanoparticle dimers and found their light emission changes significantly when close together. This is due to coupled plasmon states, offering insights into nanoparticle interactions.

Area of Science:

  • Nanotechnology
  • Plasmonics
  • Optical properties of nanoparticles

Background:

  • Gold nanoparticles exhibit unique optical properties due to surface plasmon resonance.
  • The optical behavior of nanoparticle assemblies is crucial for applications in sensing and optics.

Purpose of the Study:

  • To investigate the optical properties of gold nanoparticle dimers.
  • To understand the influence of interparticle distance and morphology on photoluminescence.

Main Methods:

  • Fabrication and characterization of gold octahedron nanoparticle dimers.
  • Experimental measurements of photoluminescence and atomic force microscopy (AFM).
  • Theoretical calculations of plasmon coupling and optical responses.

Main Results:

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  • Photoluminescence dramatically changes with proximity, showing distinct spectral shifts.
  • Uncoupled dimers exhibit a single emission peak; coupled dimers show two peaks.
  • A red-shifted peak in coupled dimers originates from a strongly coupled plasmon mode along the dimer axis.

Conclusions:

  • The optical properties of gold nanoparticle dimers are highly sensitive to interparticle coupling.
  • Anisotropic shapes and sharp features significantly influence coupling and field enhancement.
  • Theoretical models accurately predict plasmon coupling behavior and its dependence on distance and mode.