English, Article edition: GROWTH OF METAL NANO-CLUSTERS ON METAL AND OXIDE SURFACES: A RHEED STUDY M. S. ZEI

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Physical Description
  • article
Language
  • English

Edition details

Title
  • GROWTH OF METAL NANO-CLUSTERS ON METAL AND OXIDE SURFACES: A RHEED STUDY
Author
  • M. S. ZEI
Physical Description
  • article
Notes
  • The powerful RHEED technique has been demonstrated for the structural determination of the nano-crystals grown on metal and oxide substrate surfaces. Pt was electrochemically deposited onto a $Ru(10\bar{1}0)$ electrode, while Pb and cobalt were vapor deposited onto Ag(111) and oxide film/​NiAl(100), respectively under UHV conditions. At any Pt coverage, 3D-clusters develop for which the Pt clusters grow in (311) orientation on the $Ru(10\bar{1}0)$ substrate surface, where the $[01\bar{1}]$ atomic rows of the (311) facet are parallel to the $[1\bar{2}10]$ atomic rows of the $Ru(10\bar{1}0)$ surface. Due to the strong bonding at Pb/​Ag(111) interface, the Pb deposit grows in 2D-islands with a $(\sqrt{3} \times \sqrt{3})R30^{\circ}$ phase (Î < 1 ML). On the other hand, the β-crystallites of â 1 nm in diameter with inclusion of smaller-sized particles (D < 1 nm) are observed on Î-Al2O3 after Co deposition at room temperature. Annealing at 900 K Co clusters (â 3 nm) grow larger at expense of small particles on thin oxide film on NiAl(100) and become better ordered, where the [110] axis of the Co(001) facet is parallel to the [100] direction of the (001)-oxide surface. The in-plane lattice constant of Co clusters is ca. 4 larger than that of bulk Co, yielding less strain at the (001)-oxide surface. These results demonstrate that both orientation and phase of metal nano-clusters are governed by surface structure of the substrate.
  • Reflection high-energy electron diffraction (RHEED), auger electron spectroscopy, cobalt, platinum, lead, ruthenium, aluminum oxide, clusters
  • RePEc:wsi:srlxxx:v:14:y:2007:i:04:p:729-734
Language
  • English
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