Morphological Phase Diagram of Biocatalytically Active Ceria Nanostructures as a Function of Processing Variables and Their Properties

    Authors

    T. Sakthivel; S. Das; A. Kumar; D. L. Reid; A. Gupta; D. C. Sayle;S. Seal

    Comments

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

    Abbreviated Journal Title

    ChemPlusChem

    Keywords

    cerium oxide; hydrothermal synthesis; molecular dynamics; nanostructures; phase diagrams; OXIDE NANOPARTICLES; CEO2 NANORODS; ULTRAVIOLET-ABSORPTION; HYDROTHERMAL; SYNTHESIS; NANOCRYSTALS; NANOWIRES; SHAPE; NANOCUBES; SIZE; STABILITY; Chemistry, Multidisciplinary

    Abstract

    We rationalize how fluorite-structured CeO2, which is crystallographically isotropic, can grow anisotropically (without templates) to form nanoparticles, rods, and cubes. In particular, single-crystalline and monodispersed cubic CeO2 nanoparticles, nanorods, and nanocubes have been selectively synthesized by a very simple, efficient, and economical hydrothermal process using different NaOH concentrations, and Ce(NO3)(3) as the cerium precursor. High-resolution transmission electron microscopy reveals nanomaterials with differently exposed crystal planes: {111} and {100} for nanoparticles, {110} and {100} for nanorods, and {100} for nanocubes. During the preparation of the CeO2 nanomaterials, the formation of intermediate anisotropic Ce(OH)(3) species under basic conditions and their conversion into CeO2 at higher temperature are key factors responsible for the shape evolution. Atomistic computer simulations were used to help rationalize how the synthetic conditions impact upon the morphology of the nanomaterial. The synthesized CeO2 nanoparticles and nanorods demonstrate higher catalase mimetic activities than the nanocubes.

    Journal Title

    Chempluschem

    Volume

    78

    Issue/Number

    12

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    1446

    Last Page

    1455

    WOS Identifier

    WOS:000328001700003

    ISSN

    2192-6506

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