Supported Ru-Pt bimetallic nanoparticle catalysts prepared by atomic layer deposition

Steven T. Christensen, Hao Feng, Joseph L. Libera, Neng Guo, Jeffrey T. Miller, Peter C. Stair, Jeffrey W. Elam

Research output: Contribution to journalArticle

165 Citations (Scopus)

Abstract

Atomic layer deposition (ALD) is used to deposit ruthenium-platinum nanostructured catalysts using 2,4-(dimethylpentadienyl)(ethylcyclopentadienyl) ruthenium, trimethyl(methylcyclopentadienyl) platinum, and oxygen as precursors. Transmission electron microscopy shows discrete 1.2 nm nanoparticles decorating the surface of the spherical alumina support. The Ru-Pt particles are crystalline and have a crystal structure similar to pure platinum. X-ray fluorescence measurements show that the nanoparticle composition is controlled by the ratio of metal precursor ALD cycles. X-ray absorption spectroscopy at the Ru K-edge indicates a nearest neighbor Ru-Pt interaction consistent with a bimetallic composition. Methanol decomposition reactions further confirm a Ru-Pt interaction and show enhanced methanol conversion for the bimetallic nanoparticles when compared to catalysts comprised of a mixture of pure Pt and Ru nanoparticles of similar loading. These results demonstrate that ALD is a viable technique for synthesizing mixed-metal nanostructures suitable for catalysis and other applications.

Original languageEnglish
Pages (from-to)3047-3051
Number of pages5
JournalNano letters
Volume10
Issue number8
DOIs
Publication statusPublished - Aug 11 2010

Keywords

  • Atomic layer deposition
  • bimetallic catalysts
  • platinum
  • ruthenium

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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  • Cite this

    Christensen, S. T., Feng, H., Libera, J. L., Guo, N., Miller, J. T., Stair, P. C., & Elam, J. W. (2010). Supported Ru-Pt bimetallic nanoparticle catalysts prepared by atomic layer deposition. Nano letters, 10(8), 3047-3051. https://doi.org/10.1021/nl101567m