The effect of preadsorbed K on the size distribution of Au nanoparticles on TiO2(1 1 0) surface

A. M. Kiss, M. Švec, A. Berkó

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The effect of K on the morphology of Au nanoparticles deposited on TiO2(1 1 0) surface is investigated by STM-STS and AES methods. For comparison, the enhanced concentration of oxygen defect sites generated by Ar+ bombardment was also studied. It was found that both the K additive and the oxygen defect sites induce a pronounced decrease in the average size of the Au nanoparticles evolved at 320 K. On the clean TiO2(1 1 0) the average size of Au particles is 4.3 nm at approximately monolayer coverage of gold, while in the presence of K or oxygen vacancies this value decreased to 2.5 nm. In spite of the reduced average diameter detected at room temperature, the mean size of the Au nanoparticles increased significantly from 2.5 nm up to 7 nm on the effect of annealing at 500-700 K for K precoverages of 0.3-1 ML. For the clean and the Ar+ pretreated TiO2(1 1 0) surfaces the mean size of the Au particles changed only slightly on the effect of the same thermal treatments.

Original languageEnglish
Pages (from-to)3352-3360
Number of pages9
JournalSurface Science
Volume600
Issue number16
DOIs
Publication statusPublished - Aug 15 2006

Keywords

  • Au nanoparticles
  • Influence of K additive
  • MVD
  • Metal vapour deposition
  • STM
  • Scanning tunnelling microscopy
  • Size-control of the metal nanoparticles
  • TiO(1 1 0) support

ASJC Scopus subject areas

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

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