Send to:

Choose Destination
See comment in PubMed Commons below
J Am Chem Soc. 2013 Sep 4;135(35):13062-72. doi: 10.1021/ja405497p. Epub 2013 Aug 21.

Noncrystalline-to-crystalline transformations in Pt nanoparticles.

Author information

  • 1Chemical and Petroleum Engineering, and Physics, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States.


We show that the noncrystalline-to-crystalline transition of supported Pt nanoparticles (NPs) in the subnanometer to nanometer size range is statistical in nature, and strongly affected by particle size, support, and adsorbates (here we use H2). Unlike in the bulk, a noncrystalline phase exists and is stable in small NPs, reflecting a general mesoscopic feature. Observations of >3000 particles by high-resolution transmission electron microscopy show a noncrystalline-to-crystalline transition zone that is nonabrupt; there is a size regime where disordered and ordered NPs coexist. The NP size at which this transition occurs is strongly dependent on both the adsorbate and the support, and this effect is general for late 5d transition metals. All results are reconciled via a statistical description of particle-support-adsorbate interactions.

[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for American Chemical Society
    Loading ...
    Write to the Help Desk