Title

Morphological Phase Diagram Of Biocatalytically Active Ceria Nanostructures As A Function Of Processing Variables And Their Properties

Keywords

cerium oxide; hydrothermal synthesis; molecular dynamics; nanostructures; phase diagrams

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(NO 3)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. Get in shape: Single-crystalline and monodispersed nanoparticles, nanorods, and nanocubes have been synthesized selectively by using a very simple, efficient, and economical hydrothermal process by changing the experimental parameters. The results have been used to construct a morphological phase diagram showing the phase boundaries of each type of structure (see figure). Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Publication Date

12-1-2013

Publication Title

ChemPlusChem

Volume

78

Issue

12

Number of Pages

1446-1455

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1002/cplu.201300302

Socpus ID

84890392592 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84890392592

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