Diffusion and dissociation of platinum clusters on Pt(111)

Kentaro Kyuno, Gert Ehrlich

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Platinum clusters on Pt(111) have been examined using the field ion microscope to provide atomistic information about their stability and mobility, which is required for understanding the macroscopic kinetics of crystal growth. From the temperature dependence of the diffusivity D, the diffusion barrier ED and the prefactor D0 have been ascertained for clusters made up of three to seven Pt atoms. The diffusion barrier rises monotonically with cluster size, unlike the behavior of iridium clusters on Ir(111). The prefactor D0 of the largest cluster, Pt7, is unusual, exceeding that of Pt6 by two orders of magnitude. Dissociation of Pt clusters has been examined separately. Activation energies for dissociation, deduced from the temperature at which clusters disappear, also rise monotonically with size. Even at low temperatures like 350 K, diffusion as well as dissociation are found to be significant for all clusters up to and including pentamers, and can affect the kinetics of growth.

Original languageEnglish
Pages (from-to)29-37
Number of pages9
JournalSurface Science
Volume437
Issue number1
DOIs
Publication statusPublished - 1999 Aug 20
Externally publishedYes

Fingerprint

Platinum
platinum
Diffusion barriers
dissociation
Ion microscopes
Iridium
Kinetics
Crystallization
Crystal growth
Temperature
Activation energy
Atoms
ion microscopes
kinetics
iridium
diffusivity
crystal growth
activation energy
temperature dependence
atoms

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Diffusion and dissociation of platinum clusters on Pt(111). / Kyuno, Kentaro; Ehrlich, Gert.

In: Surface Science, Vol. 437, No. 1, 20.08.1999, p. 29-37.

Research output: Contribution to journalArticle

Kyuno, Kentaro ; Ehrlich, Gert. / Diffusion and dissociation of platinum clusters on Pt(111). In: Surface Science. 1999 ; Vol. 437, No. 1. pp. 29-37.
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