Title

Cationic Surface Reconstructions on Cerium Oxide Nanocrystals: An Aberration-Corrected HRTEM Study

Authors

Authors

U. M. Bhatta; I. M. Ross; T. X. T. Sayle; D. C. Sayle; S. C. Parker; D. Reid; S. Seal; A. Kumar;G. Mobus

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

ACS Nano

Keywords

nanoparticles; surface reconstruction; atomic hopping; ceria; Madelung; energy; NANOPARTICLES; RESOLUTION; CEO2(111); NANORODS; DEFECTS; Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &; Nanotechnology; Materials Science, Multidisciplinary

Abstract

Instabilities of nanoscale ceria surface facets are examined on the atomic level. The electron beam and its induced atom migration are proposed as a readily available probe to emulate and quantify functional surface activity, which is crucial for, for example, catalytic performance. In situ phase contrast high-resolution transmission electron microscopy with spherical aberration correction is shown to be the ideal tool to analyze cationic reconstruction. Hydrothermally prepared ceria nanoparticles with particularly enhanced {100} surface exposure are explored. Experimental analysis of cationic reconstruction is supported by molecular dynamics simulations where the Madelung energy is shown to be directly related to the binding energy, which enables one to generate a visual representation of the distribution of "reactive" surface oxygen.

Journal Title

Acs Nano

Volume

6

Issue/Number

1

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

421

Last Page

430

WOS Identifier

WOS:000299368300052

ISSN

1936-0851

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