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Resolving material-specific structures within Fe3O 4|γ-Mn2O3 core|shell nanoparticles using anomalous small-angle x-ray scattering

AuthorsKrycka, Kathryn L.; Salazar-Álvarez, G. ; López-Ortega, Alberto ; Estrader, Marta ; Estradé, Sònia; Sort, Jordi; Peiró, Francesca; Baró, María Dolors; Nogués, Josep
Issue Date2013
PublisherAmerican Chemical Society
CitationACS Nano 7(2): 921-931 (2013)
AbstractHere it is demonstrated that multiple-energy, anomalous small-angle X-ray scattering (ASAXS) provides significant enhancement in sensitivity to internal material boundaries of layered nanoparticles compared with the traditional modeling of a single scattering energy, even for cases in which high scattering contrast naturally exists. Specifically, the material-specific structure of monodispersed Fe3O4|γ-Mn2O3 core|shell nanoparticles is determined, and the contribution of each component to the total scattering profile is identified with unprecedented clarity. We show that Fe3O4|γ-Mn2O3 core|shell nanoparticles with a diameter of 8.2 ± 0.2 nm consist of a core with a composition near Fe3O4 surrounded by a (MnxFe1-x)3O4 shell with a graded composition, ranging from x ≈ 0.40 at the inner shell toward x ≈ 0.46 at the surface. Evaluation of the scattering contribution arising from the interference between material-specific layers additionally reveals the presence of Fe3O4 cores without a coating shell. Finally, it is found that the material-specific scattering profile shapes and chemical compositions extracted by this method are independent of the original input chemical compositions used in the analysis, revealing multiple-energy ASAXS as a powerful tool for determining internal nanostructured morphology even if the exact composition of the individual layers is not known a priori. © 2013 American Chemical Society.
Identifiersdoi: 10.1021/nn303600e
issn: 1936-0851
e-issn: 1936-086X
Appears in Collections:(CIN2) Artículos
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