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

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• 作者：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
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：August 10, 2016
• 年：2016
• 卷：16
• 期：8
• 页码：5068-5073
• 全文大小：377K
• 年卷期：0
• ISSN：1530-6992

文摘

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.