2024-03-29T06:02:37Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1991182021-01-20T11:48:57Zcom_10261_10252com_10261_3col_10261_10253
2020-01-29T08:00:59Z
urn:hdl:10261/199118
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.
Roca, Alejandro G.
López-Ortega, Alberto
Estrader, Marta
Peral, Inmaculada
Turrillas, Xabier M.
Nogués, Josep
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil)
Generalitat de Catalunya
Ministerio de Economía y Competitividad (España)
Fonds National de la Recherche Luxembourg
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/Fe3O4 core/shell nanocubes is studied at different time intervals. The results indicate that a two‐phase approach (FeO and Fe3O4) is not sufficient to successfully fit the data and two additional interface phases (FeO and Fe3O4) are needed to obtain satisfactory fits, i.e., an onion‐type structure. The analysis shows that the Fe3O4 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/Fe3O4 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.
2020-01-29T08:00:59Z
2020-01-29T08:00:59Z
2018
artículo
Small 14(30): 1800804 (2018)
1613-6810
http://hdl.handle.net/10261/199118
10.1002/smll.201800804
1613-6829
http://dx.doi.org/10.13039/501100003593
http://dx.doi.org/10.13039/501100002322
http://dx.doi.org/10.13039/501100001866
http://dx.doi.org/10.13039/501100002809
http://dx.doi.org/10.13039/501100003329
eng
https://doi.org/10.1002/smll.201800804
Sí
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2016‐77391‐R
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/IJCI‐2014‐21530
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2015‐67593‐P
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/BIA2014‐57658‐C2‐1‐R
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/SEV‐2013‐0295
closedAccess
Wiley-VCH