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Ostwald-Driven Phase Separation in Bimetallic Nanoparticle Assemblies.

Geoffroy Prévot1, Nhat Tai Nguyen2, Damien Alloyeau2

  • 1Sorbonne Universités, UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris , 75005 Paris, France.

ACS Nano
|March 19, 2016
PubMed
Summary
This summary is machine-generated.

Bimetallic nanoparticles (NPs) containing gold (Au) and palladium (Pd) undergo phase separation during annealing. This results in distinct Au-rich and Pd-rich nanoparticle populations, impacting their stability.

Keywords:
EDSOstwald ripeningTEMgoldkinetic Monte Carlopalladiumsintering

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Compositional stability of bimetallic nanoparticles (NPs) is critical for diverse applications.
  • Understanding NP behavior during thermal processes is essential for material design.

Purpose of the Study:

  • Investigate the coarsening and phase stability of amorphous carbon-supported gold-palladium (Au-Pd) bimetallic NPs.
  • Elucidate the mechanisms driving phase separation in Au-Pd NPs during annealing.

Main Methods:

  • Annealing of Au-Pd NPs on amorphous carbon support at 873 K.
  • Characterization using scanning transmission electron microscopy (STEM).
  • Elemental analysis with energy-dispersive spectroscopy (EDS).
  • Thermodynamic calculations and kinetic Monte Carlo (KMC) simulations.

Main Results:

  • Despite complete miscibility, Au-Pd NPs exhibited phase separation upon annealing.
  • Two distinct NP populations formed: Au-rich (mean radius 3.5 nm) and Pd-rich (mean radius 25 nm).
  • Observed behavior explained by surface energy, mixing energy, and differential atomic mobilities.

Conclusions:

  • Annealing induces significant phase separation in Au-Pd bimetallic NPs.
  • The interplay of thermodynamic driving forces and kinetic factors governs NP evolution.
  • Findings provide insights into controlling NP composition and stability for advanced applications.