Formation of Rh-Au core-shell nanoparticles on TiO2(HO) surface studied by STM and LEIS

L. Óvári, A. Berko, N. Balázs, Z. Majzik, J. Kiss

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Abstract

Rh-Au core-shell nanoparticles were fabricated on TiO2(110) surface by physical vapor deposition (PVD) of Rh followed by exposure of Au at elevated sample temperature (500 K). The morphology of the bimetallic particles was checked by scanning tunneling microscopy (STM). The chemical composition of the particles was characterized by low energy ion scattering (LEIS) method, It was shown that the "seeding + growing" method described, previously for growth of monometallic particles in narrow size distribution (Berko, A. et al., J. Catal. 1999, 182, 511) can also be applied for fabrication of bimetallic nanoparticles. The large mean free path of surface diffusion of gold on the oxide support makes the accumulation of Au possible exclusively on the Rh seeds formed in the first step of the procedure. By performing careful STM and LEIS experiments, it was proven that, for appropriate Au and Rh coverages, the postdeposited Au completely and uniformly covers the Rh nanoparticles.

Original languageEnglish
Pages (from-to)2167-2175
Number of pages9
JournalLangmuir
Volume26
Issue number3
DOIs
Publication statusPublished - Feb 2 2010

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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