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Plasmonic nanoparticle chains via a morphological, sphere-to-string transition.

Youngjong Kang1, Kris J Erickson, T Andrew Taton

  • 1Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, USA.

Journal of the American Chemical Society
|October 6, 2005
PubMed
Summary
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Researchers created one-dimensional gold nanoparticle chains using polymer micelles. The spacing between nanoparticles was controlled by micelle shell thickness, enabling potential plasmon waveguide applications.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Gold nanoparticles (Au NPs) are crucial for plasmonics and catalysis.
  • Controlling nanoparticle assembly is key to developing advanced nanomaterials.
  • Polymer micelles offer a versatile platform for nanoparticle encapsulation and organization.

Purpose of the Study:

  • To investigate the self-assembly of gold nanoparticles within polystyrene-block-poly(acrylic acid) (PS-b-PAA) micelles into one-dimensional arrays.
  • To demonstrate control over nanoparticle chaining and spacing through solvent conditions and starting material properties.
  • To explore the potential of these assemblies as plasmon waveguides.

Main Methods:

  • Encapsulation of Au nanoparticles within PS-b-PAA micelles.

Related Experiment Videos

  • Induction of nanoparticle chaining via salt, acid, or cationic carbodiimide treatment.
  • Characterization using scanning electron microscopy (SEM), transmission electron microscopy (TEM), dark-field optical microscopy, and visible absorption spectroscopy.
  • Analysis of surface plasmon coupling using far-field polarization microspectroscopy.

    • Main Results:

    • Au nanoparticles within PS-b-PAA micelles self-assembled into regular one-dimensional chains under specific solvent conditions.
    • Nanoparticle chaining was successfully induced by altering the micellar shell environment.
    • Chain length was modulated by additive concentration, while inter-nanoparticle spacing was determined by the PS-b-PAA shell thickness.
    • Directional surface plasmon coupling was observed in the assembled chains.

    Conclusions:

    • Polymer micelle structure provides precise control over nanoparticle assembly into ordered one-dimensional arrays.
    • The ability to tune inter-particle spacing based on micelle shell thickness is a significant finding.
    • These gold nanoparticle assemblies exhibit properties suitable for plasmon waveguide applications.