Controlled Etching of Au:SR Cluster Compounds

T. Gregory Schaaff, Robert L. Whetten

Research output: Contribution to journalArticlepeer-review

225 Scopus citations

Abstract

When Au:SR cluster compounds (R = (CH2)5CH3) with an Au metallic cluster core mass of ∼14 kDa (∼75 atoms, 1.1 nm equivalent diameter), are heated in neat dodecane-thiol solution under inert atmosphere, species with smaller Au core masses are formed, presumably by the removal of Au atoms from the outermost surface layer of the cluster's Au core. This process was monitored through laser desorption mass spectrometry, optical absorption spectroscopy, and X-ray diffraction, where all three methods indicate a substantial decrease (>50%, by mass or number of Au atoms) in the size of the cluster compound's inorganic core. The optical absorption spectra and laser desorption mass spectra of the compounds generated by etching are strikingly similar to compounds previously separated without an etching step. The dual function of the thiol as both stabilizing adsorbate and efficient etchant sets this cluster (or nanocrystal) system apart from other metallic and semiconductor systems.

Original languageEnglish (US)
Pages (from-to)9394-9396
Number of pages3
JournalJournal of Physical Chemistry B
Volume103
Issue number44
DOIs
StatePublished - Nov 4 1999
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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