Noncrystalline-to-Crystalline Transformations in Pt Nanoparticles

Journal Article · Fri Jul 19 00:00:00 EDT 2013 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja405497p· OSTI ID:1134618

Li, Long ^[1]; Wang, Lin-Lin ^[2]; Johnson, Duane D. ^[2]; Zhang, Zhongfan ^[1]; Sanchez, Sergio I. ^[3]; Kang, Joo H. ^[3]; Nuzzo, Ralph G. ^[3]; Wang, Qi ^[4]; Frenkel, Anatoly I. ^[4]; Li, Jie ^[1]; Ciston, James ^[5]; Stach, Eric A. ^[6]; Yang, Judith C. ^[1]

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1. University of Pittsburgh
2. Ames Laboratory
3. University of Illinois
4. Yeshiva University
5. Lawrence Berkeley National Laboratory
6. Brookhaven National Laboratory

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.

• Research Organization: Ames Lab., Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-07CH11358
• OSTI ID: 1134618
• Report Number(s): IS-J 8238
• Journal Information: Journal of the American Chemical Society, Vol. 135, Issue 35; ISSN 0002-7863
• Publisher: American Chemical Society (ACS)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Catalysis
Reaction Kinetics
Inorganic Reaction Mechanisms