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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Cobalt oxide-based films: sol-gel synthesis and characterization
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Cobalt oxide-based films: sol-gel synthesis and characterization

机译：氧化钴基薄膜：溶胶-凝胶合成与表征

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Recently, much attention has been focused on cobalt oxide-based materials. In this study, Co3O4, CoO and CoO-SiO2 coatings were synthesized via sol-gel using cobalt acetate [Co(CH3COO)(2)-4H(2)O] and tetraethoxysilane [Si(OC2H5)(4)] (TEOS) as starting compounds. The precursor choice was made taking into account that acetate decomposes under thermal treatment without leaving residual contaminants inside the coatings. The films were prepared by a dip-coating procedure from alcoholic solutions of the proper precursors and subsequently annealed under different conditions. Co3O4 coatings were obtained after heating in air or nitrogen at 300 degreesC. Treatments in reducing atmosphere (H-2/Ar) yielded CoO layers up to 500 degreesC, and films of metallic cobalt for firing at higher temperatures. CoO-SiO2 coatings were heated in air between 300 and 900 degreesC. CoO cluster formation in the silica glass layer is not yet well clarified. The chemical composition and the microstructural evolution of the coatings were studied by X-ray photoelectron spectroscopy (XPS), secondary-ion mass spectrometry (SIMS), UV-Vis spectroscopy and X-ray diffraction (XRD). (C) 2001 Elsevier Science B.V. All rights reserved. [References: 26]
机译：近来，许多注意力集中在基于氧化钴的材料上。在这项研究中，通过使用乙酸钴[Co（CH3COO）（2）-4H（2）O]和四乙氧基硅烷[Si（OC2H5）（4）]（TEOS）的溶胶-凝胶合成Co3O4，CoO和CoO-SiO2涂层作为起始化合物。选择前体时要考虑到乙酸盐在热处理下会分解，而不会在涂层内留下残留的污染物。通过浸涂法从适当前体的醇溶液中制备膜，然后在不同条件下退火。在空气或氮气中于300℃加热后获得Co3O4涂层。在还原性气氛（H-2 / Ar）中进行处理可得到高达500摄氏度的CoO层，以及可在更高温度下烧结的金属钴膜。 CoO-SiO2涂层在300至900摄氏度的空气中加热。二氧化硅玻璃层中CoO团簇的形成尚不十分清楚。通过X射线光电子能谱（XPS），二次离子质谱（SIMS），UV-Vis光谱和X射线衍射（XRD）研究了涂层的化学成分和微观结构演变。 （C）2001 Elsevier Science B.V.保留所有权利。 [参考：26]

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