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.

中文翻译：

---

Al 2 O 3基体上分层Co 3 O 4涂层的水热生长特征

摘要

研究了在水热条件下在多晶Al ₂ O ₃衬底表面上形成的氧化钴（II，III）涂层的形成。用扫描电子显微镜研究了所得涂层的微观结构特征。这些涂层被显示为由Co ₃ O ₄纳米片组成，该片垂直于具有花朵状花状结构的基材表面排列。通过IR光谱，X射线粉末衍射分析和能量色散光谱元素分析确认了没有结晶杂质的所需组成的涂层的产生。形成的Co ₃ O ₄的粗糙度膜通过原子力显微镜估计。通过扫描电容显微镜和开尔文探针力显微镜研究了所产生的氧化物涂层的局部电物理特性（膜表面的功函数，电容，表面电势的表面分布图和电容对比度）。对研究样品的电流-电压特性进行了局部分析。