Magnetic core@shell nanoparticles are interesting candidates for applications in areas such as drug delivery, medical imaging, hyperthermia, sensing and biodetection. In many of these applications the availability of particles, being at the same time hollow and magnetic is a great technological advantage ahead of a realistic implementation. In this work we show the characterization of CoO@MnFe2O4 magnetic hollow nanoparticles obtained using octahedron-shaped CoO nanoparticles as templates.  A 3 nm magnetite (Fe₃O₄) layer was first deposited over the CoO octahedrons. In a second steep, a solid-state reaction transforms the Fe₃O₄ into MnFe₂O₄, and the former solid octahedrons into CoO@MnFe₂O₄ hollow and pierced nanoparticles. Characterization showed the octahedron shape was maintained along the process, electron diffraction and FT also confirmed an almost perfect epitaxial growth of the shell. Finally, EELS showed a higher Fe content in the shell.

Figures:

Figure 1. (a) CoO@MnFe2O4 hollow nanoparticle. (b) EELS spectra of the whole particle and in two different points demonstrating a higher Fe content in the shell (c).

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EMC Abstracts - https://emc-proceedings.com/abstract/characterization-of-coomnfe2o4-magnetic-hollow-nanoparticles/