Abstract
The formation of a hierarchical cobalt(II, III) oxide coating on the surface of a polycrystalline Al2O3 substrate under hydrothermal conditions was studied. Features of the microstructure of the obtained coatings were investigated by scanning electron microscopy; these coatings were shown to consist of Co3O4 nanosheets arranged perpendicular to the surface of the substrate with a blossoming flower-like structure. The production of the coating of the desired composition without crystalline impurities was confirmed by IR spectroscopy, X-ray powder diffraction analysis, and energy dispersive spectroscopy elemental analysis. The roughness of the formed Co3O4 film was estimated by atomic force microscopy. The local electrophysical characteristics of the produced oxide coating (work function of film surface, capacitance, and surface distribution maps of surface potential and capacitance contrast) were studied by scanning capacitance microscopy and Kelvin probe force microscopy. A local analysis of the current–voltage characteristics of the studied samples was made.
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Funding
This work was supported by the Council for Grants of the President of the Russian Federation for Young Scientists and Postgraduates (project no. SP-2407.2019.1). The studies in this work were performed using shared experimental facilities supported by IGIC RAS state assignment.
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Translated by V. Glyanchenko
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Simonenko, T.L., Bocharova, V.A., Gorobtsov, P.Y. et al. Features of Hydrothermal Growth of Hierarchical Co3O4 Coatings on Al2O3 Substrates. Russ. J. Inorg. Chem. 65, 1304–1311 (2020). https://doi.org/10.1134/S0036023620090181
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DOI: https://doi.org/10.1134/S0036023620090181