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Title: Noncrystalline-to-Crystalline Transformations in Pt Nanoparticles

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.
 [1] ;  [2] ;  [2] ;  [1] ;  [3] ;  [3] ;  [3] ;  [4] ;  [4] ;  [1] ;  [5] ;  [6] ;  [1]
  1. University of Pittsburgh
  2. Ames Laboratory
  3. University of Illinois
  4. Yeshiva University
  5. Lawrence Berkeley National Laboratory
  6. Brookhaven National Laboratory
Publication Date:
OSTI Identifier:
Report Number(s):
IS-J 8238
Journal ID: ISSN 0002-7863
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of the American Chemical Society; Journal Volume: 135; Journal Issue: 35
American Chemical Society (ACS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
36 MATERIALS SCIENCE; Catalysis, Reaction Kinetics, Inorganic Reaction Mechanisms