Radiation-Induced Reduction of Ceria in Single and Polycrystalline Thin Films

    Authors

    A. Kumar; R. Devanathan; V. Shutthanandan; Svnt Kuchibhata; A. S. Karakoti; Y. Yong; S. Thevuthasan;S. Seal

    Comments

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    Abbreviated Journal Title

    J. Phys. Chem. C

    Keywords

    RAY-INDUCED REDUCTION; OXIDE NANOPARTICLES; MOLECULAR-DYNAMICS; CEO2; PROTECTION; SURFACES; NANOCRYSTALS; SIMULATIONS; TRANSPORT; OXIDATION; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, ; Multidisciplinary

    Abstract

    The effect of radiation on the oxidation state of Ce in high-quality single and polycrystalline ceria thin films is presented. The films were synthesized by molecular beam epitaxy and irradiated with high energy ionizing radiation of 2 MeV He+ ions with varying flux density. The surface chemistry of the irradiated ceria thin films was characterized by in situ X-ray photoelectron spectroscopy (XPS). Upon irradiation, the concentration of Ce3+ increased by 13 and 19% in single and polycrystalline ceria, respectively. Molecular dynamics simulation of thermal spikes and displacement cascade damage provide details of radiation induced defects at the end of the range of the ions that can contribute to the observed reduction.

    Journal Title

    Journal of Physical Chemistry C

    Volume

    116

    Issue/Number

    1

    Publication Date

    1-1-2012

    Document Type

    Article

    Language

    English

    First Page

    361

    Last Page

    366

    WOS Identifier

    WOS:000298978700046

    ISSN

    1932-7447

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