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Synthesis of Bimetallic Pt/Sn-based Nanoparticles in Ionic Liquids
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Bimetallic Janus nanostructures via programmed shell growth.

Naveen Gandra1, Christopher Portz, Srikanth Singamaneni

  • 1Department of Mechanical Engineering and Materials Science, Washington University in St. Louis, 1 Brooking Dr, St. Louis, MO 63130, USA.

Nanoscale
|February 7, 2013
PubMed
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We synthesized asymmetric gold-silver core-Janus shell nanostructures. These novel plasmonic nanostructures offer tunable optical properties and are highly Raman-active for biosensing applications.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Plasmonic nanostructures offer unique optical properties.
  • Tuning these properties is crucial for advanced applications.
  • Asymmetric nanostructures present new possibilities for control.

Purpose of the Study:

  • To synthesize compositionally asymmetric, core-Janus shell plasmonic nanostructures using gold (Au) and silver (Ag).
  • To investigate the impact of compositional asymmetry on optical properties.
  • To explore the potential of these nanostructures in Raman-based sensing and imaging.

Main Methods:

  • Kinetic control for asymmetric shell growth on Au cores.
  • Differential surface functionalization for programmed shell growth.

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  • UV/vis extinction spectroscopy to analyze optical properties.

    • Main Results:

    • Successful synthesis of core-Janus shell nanostructures with Au and Ag components.
    • Localized surface plasmon resonance (LSPR) is tunable based on composition and distribution.
    • Demonstrated high Raman activity of the synthesized nanostructures.

    Conclusions:

    • Core-Janus shell nanostructures provide tunable optical properties.
    • These nanostructures are promising for Raman-based biosensing and bioimaging.
    • The synthesis method allows for precise control over nanostructure design.