CO-induced changes of Ir nanoparticles supported on TiO2 (110)-(1 x 2) surface

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Abstract

Ir nanoparticles of different sizes are produced on TiO2(110)-(1 x 2) surface and characterized by scanning tunneling microscopy (STM). It was found that at very low coverage Ir is formed in round shape nanoparticles on titania which are mainly centered on the oxygen deficient rows of the (1 x 2) terraces. The annealing of the iridium covered surface caused an perceivable increase of the particle size only above 700 K. The supported iridium nanoparticles of 1-3 nm exhibit a very high reactivity towards CO. As a result of the CO adsorption at 300 K, crystallites disrupt into smaller particles, and finally into atomically dispersed Ir. This feature was not experienced for larger clusters of 8-10 nm size.

Original languageEnglish
Pages (from-to)L900-L903
JournalSurface Science
Volume411
Issue number3
DOIs
Publication statusPublished - Aug 25 1998

Keywords

  • CO-induced agglomerization of Ir particles
  • CO-induced disruption of Ir crystallites
  • Evaporation of Ir
  • Preparation of Ir nanoparticles
  • Reactivity of Ir nanoparticles
  • Scanning tunneling microscopy
  • TiO(110) support

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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