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

    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

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    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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