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Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films
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Monodisperse microisland formation on Ni/Ru(0001) monolayers.

Peter Jakob1, Kai Anhut, Sebastian Schnur

  • 1Fachbereich Physik und Wissenschaftliches Zentrum für Materialwissenschaften, Philipps-Universität Marburg, D-35032 Marburg, Germany. peter.jakob@physik.uni-marburg.de

Physical Review Letters
|December 31, 2008
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Summary

Oxygen adsorption on ruthenium surfaces creates uniform nickel microislands. This occurs as oxygen expels nickel atoms and trimers, forming stable nickel-oxygen composites. These findings offer new possibilities for nanostructured surface research.

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Area of Science:

  • Surface Science
  • Materials Science
  • Nanotechnology

Background:

  • Ruthenium (Ru) surfaces are crucial substrates in catalysis and materials science.
  • Nickel (Ni) nanostructures are of interest for various applications.
  • Understanding metal-on-metal growth dynamics is essential for controlling surface properties.

Purpose of the Study:

  • To investigate the formation of nickel microislands on a Ru(0001) surface induced by oxygen adsorption.
  • To elucidate the mechanism behind the self-assembly of these nickel nanostructures.
  • To explore the stability and structural characteristics of the resulting nickel-oxygen composites.

Main Methods:

  • Scanning Tunneling Microscopy (STM) was employed to observe the microisland formation at the atomic level.
  • Density Functional Theory (DFT) calculations were performed to understand the bonding and stability of nickel trimers and their interaction with oxygen.

Main Results:

  • Identical microislands composed of nickel trimers and multiples thereof were successfully created on Ru(0001) via oxygen adsorption.
  • Island formation is driven by an oxygen-induced expulsion of nickel atoms/trimers from a densified nickel monolayer.
  • Nickel trimers exhibit exceptional stability due to the formation of nickel-oxygen composites, confirmed by DFT.

Conclusions:

  • Oxygen adsorption provides a novel route to fabricate highly dense, uniform, and thermally stable nickel nanostructures on Ru(0001).
  • The formation of nickel-oxygen composites is key to the stability of these nanostructures.
  • These findings open new avenues for exploring the properties and applications of nanostructured surfaces.