Authors

B. R. Cuenya; A. I. Frenkel; S. Mostafa; F. Behafarid; J. R. Croy; L. K. Ono;Q. Wang

Comments

Authors: contact us about adding a copy of your work at [email protected]

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

WOS:000283575600003

ISSN

1098-0121

Download

Share

COinS
 

Accessibility Statement

This item was created or digitized prior to April 24, 2027, or is a reproduction of legacy media created before that date. It is preserved in its original, unmodified state specifically for research, reference, or historical recordkeeping. In accordance with the ADA Title II Final Rule, the University Libraries provides accessible versions of archival materials upon request. To request an accommodation for this item, please submit an accessibility request form.