Tunnelling spectroscopy of Pt nanoparticles supported on TiO2(1 1 0) surface

J. Szöko, A. Berkó

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Pt nanoparticles fabricated by metal vapour deposition were studied on TiO2(1 1 0) support as a function of their sizes by scanning tunnelling microscopy and spectroscopy (STM, STS). Two different procedures were applied for the fabrication of Pt nanoparticles: (i) deposition of the metal at room temperature followed by step by step annealing at higher temperatures; (ii) the growing of Pt seeds by deposition of Pt at 1100 K ("seeding + growing" method (J. Catal 182 (1999) 511). The I-V spectra recorded above the middle point of the Pt particles indicated that an increase in the average diameter of the nanoparticles does not result in a more metallic character. Moreover, the characteristic lineshape of the tunnelling spectra refers to an insulator character even for larger particles ( > 5 nm). This behaviour was attributed to the formation of a decoration TiOx layer on the top facets of the Pt particles. It was also found that periodic current oscillation appears in the I-V curves recorded above Pt nanoparticles decorated partially. This phenomenon may be explained by the formation of electron traps at the metal/oxide interface capturing and emitting electrons from/to the tunnelling current.

Original languageEnglish
Pages (from-to)193-199
Number of pages7
JournalVacuum
Volume71
Issue number1-2 SPEC.
DOIs
Publication statusPublished - May 9 2003

Keywords

  • Decoration
  • Pt
  • SMSI
  • STM-STS

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films

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