Strain-Dependent Chemical Reaction on Inhomogeneous Surfaces

Y. Manassen, H. Realpe, Y. Greenbaum, N. Shamir, M. H. Mintz, R. Z. Shneck

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Gd islands grow on an annealed Gd(0001)/W(110) layer in the Stransky Krastanov mode. When hydrogen is adsorbed on strained Gd islands, we find that the GdH2 nuclei are formed on the islands and not on the wetting layer between them and preferably close to the edges of the islands. This is in contrast to the usual case where the reaction is on the edge. The Gd islands on the W surface are under tensile stress, which decays due to relaxation upon approaching the edge. The lattice constant of GdH2 is smaller than that of strained Gd, but is larger (by 4%) than that of unstrained Gd. Since the surface energy of GdH2 is dependent on the strain, the rate of nucleation depends on it, too, and the nuclei are formed favorably in the areas of no strain between the strained Gd and GdH2. The distribution of the hydride nuclei around these areas is a quantitative indication to the surface energy and its dependence on strain (surface stress and elastic energy). Thus, the hydride nuclei distribution can serve as a tool for measurement of the local values of surface energy, surface stress and elastic energies. These considerations apply to every gas-solid interaction, starting by nucleation on a strained surface.

Original languageEnglish
Pages (from-to)24197-24202
Number of pages6
JournalJournal of Physical Chemistry C
Volume120
Issue number42
DOIs
StatePublished - 27 Oct 2016

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy (all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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