Controlled Oxidation of Cobalt Nanoparticles to Obtain Co/CoO/Co3O4 Composites with Different Co Content

Aleksandr S Lozhkomoev; Alexander V Pervikov; Sergey O Kazantsev; Konstantin V Suliz; Roman V Veselovskiy; Andrey A Miller; Marat I Lerner

doi:10.3390/nano12152523

Controlled Oxidation of Cobalt Nanoparticles to Obtain Co/CoO/Co₃O₄ Composites with Different Co Content

Nanomaterials (Basel). 2022 Jul 22;12(15):2523. doi: 10.3390/nano12152523.

Authors

Aleksandr S Lozhkomoev¹, Alexander V Pervikov², Sergey O Kazantsev^{1

3}, Konstantin V Suliz^{1

3}, Roman V Veselovskiy⁴, Andrey A Miller⁵, Marat I Lerner^{2

3}

Affiliations

¹ Laboratory of Nanobioengineering, Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, 634021 Tomsk, Russia.
² Laboratory of Physical Chemistry of Ultrafine Materials, Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, 634021 Tomsk, Russia.
³ Research and Education Center of Additive Technologies, National Research Tomsk State University, 634050 Tomsk, Russia.
⁴ Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, 123242 Moscow, Russia.
⁵ Shared Use Center "Nanotech", Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, 634021 Tomsk, Russia.

Abstract

The paper studies patterns of interaction of electroexplosive Co nanoparticles with air oxygen during heating. The characteristics of Co nanoparticles and composite Co/CoO/Co₃O₄ nanoparticles formed as a result of oxidation were studied using transmission electron microscopy, X-ray phase analysis, thermogravimetric analysis, differential scanning calorimetry, and vibrating sample magnetometry. It was established that nanoparticles with similar morphology in the form of hollow spheres with different content of Co, CoO, and Co₃O₄ can be produced by varying oxidation temperatures. The influence of the composition of composite nanoparticles on their magnetic characteristics is shown.

Keywords: cobalt nanoparticles; composite nanoparticles; electrical explosion of wire; magnetic properties; oxidation.

Grants and funding

21-79-30006/Russian Science Foundation