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)

Abstract

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
JournalNanotechnology
Volume20
Issue number24
DOIs
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)

Fingerprint

Dive into the research topics of 'An in situ real-time x-ray diffraction study of phase segregation in Au-Pt nanoparticles'. Together they form a unique fingerprint.

Cite this