Title
Three-dimensional valency mapping in ceria nanocrystals Three-dimensional valency mapping in ceria nanocrystals
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Subject
Physics
Chemistry
Engineering sciences. Technology
Source (journal)
ACS nano
Volume/pages
8(2014) :10 , p. 10878-10884
ISSN
1936-0851
ISI
000343952600126
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Using electron tomography combined with electron energy loss spectroscopy (EELS), we are able to map the valency of the Ce ions in CeO2-x nanocrystals in three dimensions. Our results show a clear facet-dependent reduction shell at the surface of ceria nanoparticles; {111} surface facets show a low surface reduction, whereas at {001} surface facets, the cerium ions are more likely to be reduced over a larger surface shell. Our generic tomographic technique allows a full 3D data cube to be reconstructed, containing an EELS spectrum in each voxel. This possibility enables a three-dimensional investigation of a plethora of material-specific physical properties such as valency, chemical composition, oxygen coordination, or bond lengths, triggering the synthesis of nanomaterials with improved properties.
E-info
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Full text (open access)
https://repository.uantwerpen.be/docman/irua/8aa7cb/121219.pdf
Handle