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Title
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Three-dimensional valency mapping in ceria nanocrystals
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Author
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Abstract
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| 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. |
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Language
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English
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Source (journal)
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ACS nano. - -
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Publication
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2014
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ISSN
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1936-0851
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DOI
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10.1021/NN5047053
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Volume/pages
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8
:10
(2014)
, p. 10878-10884
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ISI
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000343952600126
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Pubmed ID
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25286190
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Full text (Publisher's DOI)
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Full text (open access)
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