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Issue 13, 2013
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Characterisation of Co@Fe3O4 core@shell nanoparticles using advanced electron microscopy

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Abstract

Cobalt nanoparticles were synthesised via the thermal decomposition of Co2(CO)8 and were coated in iron oxide using Fe(CO)5. While previous work focused on the subsequent thermal alloying of these nanoparticles, this study fully elucidates their composition and core@shell structure. State-of-the-art electron microscopy and statistical data processing enabled chemical mapping of individual particles through the acquisition of energy-filtered transmission electron microscopy (EFTEM) images and detailed electron energy loss spectroscopy (EELS) analysis. Multivariate statistical analysis (MSA) has been used to greatly improve the quality of elemental mapping data from core@shell nanoparticles. Results from a combination of spatially resolved microanalysis reveal the shell as Fe3O4 and show that the core is composed of oxidatively stable metallic Co. For the first time, a region of lower atom density between the particle core and shell has been observed and identified as a trapped carbon residue attributable to the organic capping agents present in the initial Co nanoparticle synthesis.

Graphical abstract: Characterisation of Co@Fe3O4 core@shell nanoparticles using advanced electron microscopy

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Publication details

The article was received on 23 Nov 2012, accepted on 17 Feb 2013 and first published on 20 Feb 2013


Article type: Paper
DOI: 10.1039/C3NR33789H
Citation: Nanoscale, 2013,5, 5765-5772
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    Characterisation of Co@Fe3O4 core@shell nanoparticles using advanced electron microscopy

    B. R. Knappett, P. Abdulkin, E. Ringe, D. A. Jefferson, S. Lozano-Perez, T. C. Rojas, A. Fernández and A. E. H. Wheatley, Nanoscale, 2013, 5, 5765
    DOI: 10.1039/C3NR33789H

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