Thermal and radiolysis assisted formation of Au-Pd heteroaggregates

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Abstract

In the presence of pre-synthesized Au nanoparticles both pulse radiolysis and 2-propanol assisted reduction of Pd (II) chloride to palladium have been investigated with the intention to check the possible formation of Au-Pd heteroaggregates. Pulse radiolysis of Pd2+ (50 Gy dose/pulse at 298 K in 270 mM 2-propanol to scavange OH radicals) produced Pd nanoparticles of 3.9-2.5 nm depending on the citrate concentration (2.8-12 × 10-4 M). UV-vis measurements and TEM investigations confirmed that part of the Pd particles were attached to the Au particles of 28 ± 6 nm forming Au-Pd heteroaggregates. Hydrothermal treatment of Pd hydrosol at 363-395 K in the presence of Au nanoparticles was observed to facilitate formation of Pd tendrils on Au and 2D Pd structures by aggregation process. Reduction of Pd2+ with 2-propanol (1.55-2.2 M) in Au hydrosol and sodium citrate as capping agent was also tested at 348-353 K. At pH 3.5-4.5 reduction of Pd2+ resulted in an effective decoration of the gold particles with small crystals of Pd. The observed structures definitely differ from the usual Au/Pd core/shell nanoparticles. The Pd-Au samples were characterized by UV-vis, transmission electron microscopy (TEM) and energy dispersive spectrometry (EDS). Hydrogenation of 1,3-cyclooctadiene in the liquid phase was applied for the additional characterization of the structurally different samples.

Original languageEnglish
Pages (from-to)124-129
Number of pages6
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume322
Issue number1-3
DOIs
Publication statusPublished - Jun 5 2008

Keywords

  • Hydrogenation of 1,3-cyclooctadiene
  • Pd nanoparticles
  • Pd-Au heteroaggregate
  • Pulse radiolysis
  • Reduction with 2-propanol

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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