Rh and Au deposited on ultrathin TiO∼1.2 film formed on Rh(111) facets and the effects of CO exposure

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

This STM study deals with the structure and reactivity of Rh and Au deposited on a "pinwheel" TiO∼1.2 ultrathin film (w-TiO-UTO) formed on Rh nanoparticles supported on TiO2(110). The deposition of a monolayer (ML) Au at 500 K disturbed the order of the w-TiO-UTO layer and led to the formation of 3D adparticles. The deposition of Rh (∼1 ML) at 500 K and annealing up to 900 K led exclusively to the formation of 2D adparticles. It was found that 3D Au nanoparticles are gradually sintering in the range of 500-800 K. Upon a further raise of the temperature, a 3D→2D transformation takes place. The main difference is that on the top facet of the 2D Rh particles a w-TiO-UTO film forms, while the top facets of the 2D Au particles exhibit a clean gold metal structure. CO exposure of max. 10 min at 10 Pa causes no remarkable change of the encapsulated Rh particles, however, the 2D gold nanoparticles change significantly. The disintegration of Au particles and the spillover of Au atoms to the UTO surface accelerate at a CO pressure above 10-1 Pa. This morphological process is reversible as an effect of annealing in UHV.

Original languageEnglish
Pages (from-to)300-304
Number of pages5
JournalSurface Science
Volume641
DOIs
Publication statusPublished - Nov 27 2015

Fingerprint

Ultrathin films
Carbon Monoxide
flat surfaces
Nanoparticles
Gold
Monolayers
Annealing
nanoparticles
Disintegration
gold
annealing
disintegration
Sintering
Metals
Atoms
sintering
reactivity
causes
metals
atoms

Keywords

  • CO
  • Gas-induced disruption
  • Gold
  • Pinwheel TiO<inf>x</inf> ultrathin layer
  • Rhodium
  • STM

ASJC Scopus subject areas

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

Cite this

Rh and Au deposited on ultrathin TiO∼1.2 film formed on Rh(111) facets and the effects of CO exposure. / Berkó, A.; Gubó, R.; Óvári, L.; Kónya, Z.

In: Surface Science, Vol. 641, 27.11.2015, p. 300-304.

Research output: Contribution to journalArticle

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