Abbreviated Journal Title
Phys. Rev. B
Keywords
VIBRATIONAL PROPERTIES; MICELLE ENCAPSULATION; METAL; NANOCRYSTALS; CATALYSTS; CLUSTERS; DISORDER; SURFACE; EXAFS; Physics, Condensed Matter
Abstract
Anomalous lattice dynamics and thermal behavior have been observed for ligand-free, size-, and shape-selected Pt nanoparticles (NPs) supported on nanocrystalline gamma-Al(2)O(3) via extended x-ray absorption fine-structure spectroscopy. Several major differences were observed for the NPs with respect to bulk Pt: (i) a contraction in the interatomic distances, (ii) a reduction in the dynamic (temperature-dependent) bond-length disorder and associated increase in the Debye temperature (theta(D)), and (iii) an overall decrease in the bond-length expansion coefficient coupled with NP stiffening. The increase in the Debye temperature is explained in terms of the NP size, shape, support interactions, and adsorbate effects. For a similar average size, we observe a striking correlation between the shapes of the NPs and their theta(D) values.
Journal Title
Physical Review B
Volume
82
Issue/Number
15
Publication Date
1-1-2010
Document Type
Article
Language
English
First Page
8
WOS Identifier
ISSN
1098-0121
Recommended Citation
Cuenya, B. Roldan; Frenkel, A. I.; Mostafa, S.; Behafarid, F.; Croy, J. R.; Ono, L. K.; and Wang, Q., "Anomalous lattice dynamics and thermal properties of supported size- and shape-selected Pt nanoparticles" (2010). Faculty Bibliography 2010s. 74.
https://stars.library.ucf.edu/facultybib2010/74
Comments
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