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Hexanethiolate monolayer protected 38 gold atom cluster.

Victoria L Jimenez1, Dimitra G Georganopoulou, Ryan J White

  • 1Kenan Laboratories of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 28, 2004
PubMed
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Researchers modified the Brust reaction to produce gold nanoparticles (Au38) coated in hexanethiolate. This method yields a specific cluster size, offering insights into nanoparticle synthesis and characterization for advanced materials.

Area of Science:

  • Nanotechnology
  • Materials Science
  • Physical Chemistry

Background:

  • The Brust reaction is a common method for synthesizing monolayer-protected gold nanoparticles.
  • Controlling nanoparticle size and composition is crucial for their applications.

Purpose of the Study:

  • To modify the Brust reaction for enhanced production of 38-atom gold nanoparticles (Au38) with hexanethiolate monolayers.
  • To characterize the synthesized Au38 clusters and investigate their properties.

Main Methods:

  • Modified Brust reaction with low-temperature reduction (-78°C) and thiol excess.
  • Characterization using Transmission Electron Microscopy (TEM), Laser Ionization-Desorption Mass Spectrometry (LIMS), Thermogravimetric Analysis (TGA), and Elemental Analysis.
  • Monodispersity assessed by Reverse Phase High-Performance Liquid Chromatography (HPLC).

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Main Results:

  • Successful synthesis of Au38(C6)24 hexanethiolate monolayer-protected clusters (MPCs).
  • HPLC analysis indicated good monodispersity but revealed a mixture of closely related MPCs.
  • Electrochemical and optical measurements showed an energy gap of 1.6 eV and a HOMO-LUMO edge at 1.3 eV.

Conclusions:

  • The modified Brust reaction effectively produces Au38 MPCs.
  • The synthesized nanoparticles exhibit distinct electrochemical and optical properties.
  • Further investigation into the heterogeneity of MPCs is warranted.