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Combining X-Ray Whole Powder Pattern Modeling, Rietveld and Pair Distribution Function Analyses as a Novel Bulk Approach to Study Interfaces in Heteronanostructures : Oxidation Front in FeO/Fe3O4 Core/Shell Nanoparticles as a Case Study
Ichikawa, Rodrigo U. (IPEN-Instituto de Pesquisas Energéticas e Nucleares)
Gómez Roca, Alejandro (Institut Català de Nanociència i Nanotecnologia)
López Ortega, Alberto (CIC nanoGUNE)
Estrader, Marta (Institut Català de Nanociència i Nanotecnologia)
Peral Alonso, Inmaculada (ALBA Laboratori de Llum de Sincrotró)
Turrillas, Xabier (ALBA Laboratori de Llum de Sincrotró)
Nogués i Sanmiquel, Josep (Institut Català de Nanociència i Nanotecnologia)

Fecha: 2018
Resumen: Understanding the microstructure in heterostructured nanoparticles is crucial to harnessing their properties. Although microscopy is ideal for this purpose, it allows for the analysis of only a few nanoparticles. Thus, there is a need for structural methods that take the whole sample into account. Here, a novel bulk-approach based on the combined analysis of synchrotron X-ray powder diffraction with whole powder pattern modeling, Rietveld and pair distribution function is presented. The microstructural temporal evolution of FeO/FeO core/shell nanocubes is studied at different time intervals. The results indicate that a two-phase approach (FeO and FeO) is not sufficient to successfully fit the data and two additional interface phases (FeO and FeO) are needed to obtain satisfactory fits, i. e. , an onion-type structure. The analysis shows that the FeO phases grow to some extent (≈1 nm) at the expense of the FeO core. Moreover, the FeO core progressively changes its stoichiometry to accommodate more oxygen. The temporal evolution of the parameters indicates that the structure of the FeO/FeO nanocubes is rather stable, although the exact interface structure slightly evolves with time. This approach paves the way for average studies of interfaces in different kinds of heterostructured nanoparticles, particularly in cases where spectroscopic methods have some limitations.
Nota: Altres ajuts: Beatriu de Pinos Program (2011 BPB 00209)
Nota: Número d'acord de subvenció AGAUR/2017/SGR-292
Nota: Número d'acord de subvenció MINECO/MAT2016-77391-R
Nota: Número d'acord de subvenció MINECO/IJCI-2014-21530
Nota: Número d'acord de subvenció MINECO/MAT2015-67593-P
Nota: Número d'acord de subvenció MINECO/BIA2014-57658-C2-1-R
Nota: Número d'acord de subvenció MINECO/SEV-2013-0295
Derechos: Tots els drets reservats.
Lengua: Anglès.
Documento: article ; recerca ; submittedVersion
Materia: Core/shell nanoparticles ; Interfaces ; Iron oxides ; Pair distribution function ; Rietveld ; Whole powder pattern modeling ; X-ray diffraction
Publicado en: Small, Vol. 14, Issue 30 (July 2018) , art. 1800804, ISSN 1613-6829

DOI: 10.1002/smll.201800804


Preprint
43 p, 3.3 MB

El registro aparece en las colecciones:
Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > Institut Català de Nanociència i Nanotecnologia (ICN2)
Artículos > Artículos de investigación
Artículos > Artículos publicados

 Registro creado el 2019-10-21, última modificación el 2020-02-29



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