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Alkanetelluroxide-protected gold nanoparticles.

Ying Li1, Latoya C Silverton, Richard Haasch

  • 1Department of Chemistry, Georgetown University, Washington, D.C. 20057, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 19, 2008
PubMed
Summary

Researchers synthesized the first air-stable gold nanoparticles (Au NPs) protected by tellurium-containing ligands. This novel approach utilizes dioctyl ditelluride, forming stable octanetelluroxide-protected Au NPs with potential applications in nanotechnology.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Inorganic Chemistry

Background:

  • Gold nanoparticles (Au NPs) are widely studied for their unique properties.
  • Thiolate-protected Au NPs are common, but their precursors can be unstable.
  • Developing alternative, stable ligand-protected Au NPs is crucial for advancing nanotechnology.

Purpose of the Study:

  • To synthesize and characterize the first air-stable tellurium-containing ligand-protected gold nanoparticles (NPs).
  • To investigate the use of dioctyl ditelluride as a precursor for gold nanoparticle synthesis.
  • To elucidate the structure and stability of the resulting tellurium-protected gold nanoparticles.

Main Methods:

  • Utilized the Brust two-phase approach for gold nanoparticle synthesis.

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  • Employed dioctyl ditelluride as the tellurium-containing ligand precursor.
  • Characterized the synthesized Au NPs using NMR (1H, 13C, 125Te), IR spectroscopy, XPS, TEM, and TGA.

    • Main Results:

    • Successfully synthesized air-stable gold nanoparticles protected by octanetelluroxide ligands.
    • Demonstrated that dioctyl ditelluride breaks its Te-Te bond and binds to the gold core.
    • Characterization confirmed an average particle size of 2.7 nm and approximately 53% ligand monolayer coverage.
    • Identified an intermediate state (Au to Te ratio of 1.5) crucial for forming stable NPs.

    Conclusions:

    • Dioctyl ditelluride is an effective precursor for creating air-stable, tellurium-protected gold nanoparticles.
    • The novel octanetelluroxide ligands provide enhanced stability to the gold nanoparticles.
    • The reductive power of dioctyl ditelluride and the intermediate state are key to this sophisticated NP synthesis.