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

Authors

  • Dr. Tamilselvan Sakthivel,

    1. Advanced Materials Processing and Analysis Center (AMPAC), NanoScience Technology Center (NSTC), Materials Science Engineering (MSE) Department, University of Central Florida, 4000, Central Florida Boulevard, Orlando, FL 32816 (USA), Fax: (+1) 407-882-1175
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  • Dr. Soumen Das,

    1. Advanced Materials Processing and Analysis Center (AMPAC), NanoScience Technology Center (NSTC), Materials Science Engineering (MSE) Department, University of Central Florida, 4000, Central Florida Boulevard, Orlando, FL 32816 (USA), Fax: (+1) 407-882-1175
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  • Dr. Amit Kumar,

    1. Advanced Materials Processing and Analysis Center (AMPAC), NanoScience Technology Center (NSTC), Materials Science Engineering (MSE) Department, University of Central Florida, 4000, Central Florida Boulevard, Orlando, FL 32816 (USA), Fax: (+1) 407-882-1175
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  • Dr. David L. Reid,

    1. Advanced Materials Processing and Analysis Center (AMPAC), NanoScience Technology Center (NSTC), Materials Science Engineering (MSE) Department, University of Central Florida, 4000, Central Florida Boulevard, Orlando, FL 32816 (USA), Fax: (+1) 407-882-1175
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  • Ankur Gupta,

    1. Advanced Materials Processing and Analysis Center (AMPAC), NanoScience Technology Center (NSTC), Materials Science Engineering (MSE) Department, University of Central Florida, 4000, Central Florida Boulevard, Orlando, FL 32816 (USA), Fax: (+1) 407-882-1175
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  • Dr. Dean C. Sayle,

    1. School of Physical Science, University of Kent, Canterbury, Kent, CT2 7NZ (UK)
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  • Dr. Sudipta Seal

    Corresponding author
    1. Advanced Materials Processing and Analysis Center (AMPAC), NanoScience Technology Center (NSTC), Materials Science Engineering (MSE) Department, University of Central Florida, 4000, Central Florida Boulevard, Orlando, FL 32816 (USA), Fax: (+1) 407-882-1175
    • Advanced Materials Processing and Analysis Center (AMPAC), NanoScience Technology Center (NSTC), Materials Science Engineering (MSE) Department, University of Central Florida, 4000, Central Florida Boulevard, Orlando, FL 32816 (USA), Fax: (+1) 407-882-1175

    Search for more papers by this author

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.

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