Hexanethiolate monolayer protected 38 gold atom cluster

Victoria L. Jimenez, Dimitra G. Georganopoulou, Ryan J. White, Amanda S. Harper, Allan J. Mills, Dongil Lee, Royce W. Murray

Research output: Contribution to journalArticle

121 Citations (Scopus)

Abstract

The nucleation-growth-passivation Brust reaction has been modified so as to enrich the product in useful quantities of a 38-atom gold nanoparticle coated with a hexanethiolate monolayer. Two modifications are described, using -78°C reduction temperature and a hyperexcess of thiol. Compositional evidence is presented that establishes the product as a Au 38(C6) 24 hexanethiolate monolayer protected cluster (MPC), based on transmission electron microscopy, laser ionization-desorption mass spectrometry, thermogravimetric analysis, and elemental analysis. Reverse phase HPLC confirms the relatively good monodispersity of the MPC products, but high-resolution double-column HPLC reveals that the MPCs are a mixture of closely related but chromatographically distinct products. Voltammetry, low energy spectrophotometry, and spectroelectrochemistry reveal, respectively, a 1.6 eV electrochemical energy gap between the first oxidation and the first reduction, an optical HOMO-LUMO energy absorbance edge at 1.3 eV, and a bleaching of optical absorbance near the 1.3 eV band edge that accompanies electrochemical oxidation of the nanoparticle.

Original languageEnglish
Pages (from-to)6864-6870
Number of pages7
JournalLangmuir
Volume20
Issue number16
DOIs
Publication statusPublished - 2004 Aug 3

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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    Jimenez, V. L., Georganopoulou, D. G., White, R. J., Harper, A. S., Mills, A. J., Lee, D., & Murray, R. W. (2004). Hexanethiolate monolayer protected 38 gold atom cluster. Langmuir, 20(16), 6864-6870. https://doi.org/10.1021/la049274g