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  • Title: An in situ real-time x-ray diffraction study of phase segregation in Au-Pt nanoparticles.
    Author: Malis O, Radu M, Mott D, Wanjala B, Luo J, Zhong CJ.
    Journal: Nanotechnology; 2009 Jun 17; 20(24):245708. PubMed ID: 19471088.
    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 degrees 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 Au(41)Pt(59) nanoparticles exhibit the signature of incipient phase segregation that develops into full phase separation during annealing at high temperature.
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