HREM studies of the structure and the oxidation process of copper clusters created by inert gas aggregation

  • J. Urban
  • H. Sack-Kongehl
  • K. Weiss
Clusters

Abstract

Structure and reactivity with oxigen of Cu clusters in the size range of 4.5±2.5 nm created by the inert gas aggregation technique were studied by HREM. The pure Cu clusters investigated under clean conditions show the structures of MTP's with a small lattice dilatation of the (111) plane of 1.25%. For icosahedral and decahedral particles this dilatation corresponds to a splitting of the nearest neighbour distance showing two different values, i.e. dilatation of 2.2% and contraction of 2.8% for the two edges of the deformed tetrahedral subunits, respectively. Oxidation at room temperature and air pressure of 1 bar only begins after a few minutes of exposure to air, after having undergone creation of probably non-stoichiometric intermediate states in the cuprite Cu2O structure with the bulk values of the bond lengths.

PACS

36.40.+d 61.16.B9 

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • J. Urban
    • 1
  • H. Sack-Kongehl
    • 1
  • K. Weiss
    • 1
  1. 1.Abt. Anorganische ChemieFritz-Haber-Institut der Max-Planck-GesellschaftBerlinGermany

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