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

Fingerprint

Spectroscopy
Nanoparticles
nanoparticles
Metals
spectroscopy
Electron traps
Vapor deposition
metal vapors
Scanning tunneling microscopy
inoculation
Oxides
metal oxides
Seed
scanning tunneling microscopy
seeds
flat surfaces
electrons
insulators
traps
vapor deposition

Keywords

  • Decoration
  • Pt
  • SMSI
  • STM-STS

ASJC Scopus subject areas

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

Cite this

Tunnelling spectroscopy of Pt nanoparticles supported on TiO2(1 1 0) surface. / Szöko, J.; Berkó, A.

In: Vacuum, Vol. 71, No. 1-2 SPEC., 09.05.2003, p. 193-199.

Research output: Contribution to journalArticle

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