An in situ real-time x-ray diffraction study of phase segregation in Au-Pt nanoparticles

O. Malis, M. Radu, Derrick Michael Mott, B. Wanjala, J. Luo, C. J. Zhong

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


In situ real-time x-ray diffraction was used to study phase segregation and coarsening of Au-Pt nanoparticles supported on silica powder, and porous alumina membranes. Contrary to the expectations from the bulk phase diagram, silica supported Au-Pt nanoparticles have an alloyed structure that is preserved even after extensive annealing at temperatures as high at 700 °C. In stark contrast, alumina supported Au-Pt nanoparticles exhibit a rich phase behaviour that is sensitive to alloy composition and the details of the synthesis process. In particular, low-density as-prepared Au41Pt59 nanoparticles exhibit the signature of incipient phase segregation that develops into full phase separation during annealing at high temperature.

Original languageEnglish
Article number245708
Issue number24
Publication statusPublished - 2009 Jun 19
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)


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