3D Visualization of the Iron Oxidation State in FeO/Fe<inf>3</inf>O<inf>4</inf> Core-Shell Nanocubes from Electron Energy Loss Tomography

Pau Torruella, Raúl Arenal, Francisco De La Peña, Zineb Saghi, Lluís Yedra, Alberto Eljarrat, Lluís López-Conesa, Marta Estrader, Alberto López-Ortega, Germán Salazar-Alvarez, Josep Nogués, Caterina Ducati, Paul A. Midgley, Francesca Peiró, Sonia Estradé

Research output: Contribution to journalArticleResearchpeer-review

34 Citations (Scopus)

Abstract

© 2016 American Chemical Society. 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 Fe2+ and Fe3+ ions in a FeO/Fe3O4 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.
Original languageEnglish
Pages (from-to)5068-5073
JournalNano Letters
Volume16
Issue number8
DOIs
Publication statusPublished - 10 Aug 2016

Keywords

  • compressed sensing
  • EELS
  • Electron tomography
  • ELNES
  • iron oxide
  • oxidation states

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