Tuning the porosity of bimetallic nanostructures by a soft templating approach

Anaïs Lehoux, Laurence Ramos, Patricia Beaunier, Daniel Bahena Uribe, Philippe Dieudonné, Fabrice Audonnet, Arnaud Etcheberry, Miguel José-Yacaman, Hynd Remita

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Hexagonal mesophases made of oil-swollen surfactant-stabilized tubes arranged on a triangular lattice in water and doped with metallic salts are used as templates for the radiolytic synthesis of nanostructures. The nanostructures formed in this type of soft matrix are bimetallic palladium-platinum porous nanoballs composed of 3D-connected nanowires, of typical thickness 2.5 nm, forming hexagonal cells. Using electron microscopy and small-angle X-ray scattering it is demonstrated that the pore size of the nanoballs is directly determined by the diameter of the oil tube of the doped mesophases, which is varied in a controlled fashion from 10 to 55 nm. Bimetallic nanostructures composed of various proportions of palladium and platinum can be synthesized. Their alloy structure is studied using X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy, and high-angular dark field scanning transmission electron microscopy experiments. The templating approach allows the synthesis of bimetallic nanoballs of tunable porosity and composition.

Original languageEnglish (US)
Pages (from-to)4900-4908
Number of pages9
JournalAdvanced Functional Materials
Volume22
Issue number23
DOIs
StatePublished - Dec 5 2012
Externally publishedYes

Keywords

  • 3D-porous nanostructures
  • bimetallic nanoparticles
  • palladium-platinum alloy
  • radiolysis
  • soft templates

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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