3D Visualization of the Iron Oxidation State in FeO/Fe3O4 Core-Shell Nanocubes from Electron Energy Loss Tomography

Author

Torruella, Pau

Arenal, Raúl

Peña, Francisco de la

Saghi, Zineb

Yedra Cardona, Lluís

Eljarrat Ascunce, Alberto

López Conesa, Lluís

Estrader i Bofarull, Marta

López-Ortega, Alberto

Salazar Álvarez, Germán

Nogués, Josep

Ducati, Caterina

Midgley, Paul A.

Peiro, Francesca

Estrade, Sonia

Publication date

2016

Abstract

The physicochemical properties used in numerous advanced nanostructured devices are directly controlled by the oxidation states of their constituents. In this work we combine electron energy-loss spectroscopy, blind source separation, and computed tomography to reconstruct in three dimensions the distribution of Fe and Fe ions in a FeO/FeO core/shell cube-shaped nanoparticle with nanometric resolution. The results highlight the sharpness of the interface between both oxides and provide an average shell thickness, core volume, and average cube edge length measurements in agreement with the magnetic characterization of the sample.

Document Type

Article

Language

English

Subjects and keywords

Compressed sensing; EELS; Electron tomography; ELNES; Iron oxide; Oxidation states

Publisher

 

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Rights

open access

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