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Title: | Resolving material-specific structures within Fe₃O₄|γ-Mn₂O₃ core|shell nanoparticles using anomalous small-angle X-ray scattering |
Author: | Krycka, L. Kathryn Borchers, Julie A. Salazar-Alvarez, German López-Ortega, Alberto Estrader i Bofarull, Marta Estradé Albiol, Sònia Winkler, Elin Zysler, R. D. Sort, Jordi Peiró Martínez, Francisca Baró, M. D. Kao, C. C. Nogués, Josep |
Keywords: | Nanopartícules Dispersió de neutrons Difracció de raigs X Òxids Nanoparticles Neutrons scattering X-rays diffraction Oxides |
Issue Date: | 2013 |
Publisher: | American Chemical Society |
Abstract: | Here 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 (Mn(x)Fe(1-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. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1021/nn303600e |
It is part of: | ACS Nano, 2013, vol. 7, num. 2, p. 921-931 |
URI: | http://hdl.handle.net/2445/176409 |
Related resource: | https://doi.org/10.1021/nn303600e |
ISSN: | 1936-0851 |
Appears in Collections: | Articles publicats en revistes (Química Inorgànica i Orgànica) Articles publicats en revistes (Enginyeria Electrònica i Biomèdica) |
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