Formation and characterization of Rh-Mo bimetallic layers on the TiO2(1 1 0) surface

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Abstract

The investigation of Rh, Mo and Rh-Mo nanosized clusters formed by physical vapor deposition on TiO2(1 1 0) single crystal was performed by X-ray Photoelectron Spectroscopy (XPS), Low Energy Ion Scattering (LEIS) and Auger Electron Spectroscopy (AES). There was no sign for site-exchange between Mo and Rh atoms during deposition of Mo onto Rh particles at 330 K. Mixing between Ti and Mo ions was facilitated at the Mo particle-titania interface due to reaction at 550-700 K. The redox process between titania and Mo deposit was hindered at 330 K by forming predeposited rhodium layer (ΘRh = 2.0 ML), but reached nearly the same extent as without Rh after moderate heating to 600 K. The encapsulation of Rh by titania was complete by about 700 K in the presence of 1.2 ML Mo, in case of Mo-predeposition and Mo-postdeposition as well. Elevating the temperature of TiO2/Rh-Mo layers above 700 K, these metals form alloy at the Mo-Rh interface irrespective of deposition sequences.

Original languageEnglish
Pages (from-to)2958-2963
Number of pages6
JournalSurface Science
Volume603
Issue number19
DOIs
Publication statusPublished - Oct 1 2009

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Keywords

  • Alloying
  • Bimetallic
  • Encapsulation
  • Interfacial reaction
  • Mo
  • Rh
  • Thermal activation
  • TiO(1 1 0)

ASJC Scopus subject areas

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

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