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目的:合成成分连续可调的Co_xNi_(1-x)O合金纳米晶,揭示Co_xNi_(1-x)O合金纳米晶的形貌和晶体结构随纳米晶中钴离子含量的变化规律以及考察金属离子在合金纳米晶的分布情况。创新点:1.利用金属羧酸盐在有机体系中的醇解反应制备Co_xNi_(1-x)O合金纳米晶,其反应温度仅为270°C,显著低于文献报道中所使用的温度;2.成功实现Co_xNi_(1-x)O纳米晶成分的调节,发现纳米晶形貌随成分的变化规律;3.揭示了金属离子在合金纳米晶中的均匀分布。方法:1.在硬脂酸锂的“配体保护”作用下,利用金属羧酸盐的醇解反应制备Co_xNi_(1-x)O合金纳米晶;2.利用透射电子显微镜、X射线衍射、原子发射光谱和X射线光电子等手段研究Co_xNi_(1-x)O合金纳米晶的形貌、晶体结构、成分和金属离子价态等信息。结论:1.成功地制备出高质量的Co_xNi_(1-x)O(x?[0,1])合金纳米晶;2.发现Co_xNi_(1-x)O合金纳米晶的形貌和晶体结构随纳米晶中钴离子浓度的提高呈现出由Ni O特征过渡到CoO特征的趋势;3.对单颗Co_xNi_(1-x)O合金纳米晶的元素扫描揭示了金属离子在纳米晶中的均匀分布。
OBJECTIVE: To synthesize Co_xNi_ (1-x) O alloy nanocrystals with continuously adjustable composition, revealing the variation of the morphology and crystal structure of Co_xNi_ (1-x) O alloy nanocrystals with the content of cobalt ions in nanocrystals, The distribution of the alloy nanocrystal. Innovative points: 1. Co_xNi_ (1-x) O alloy nanocrystals were prepared by alcoholysis reaction of metal carboxylates in organic system, the reaction temperature was only 270 ° C, which was significantly lower than the temperature used in the literature; 2. The successful adjustment of the composition of Co_xNi_ (1-x) O nanocrystals shows that the morphology of the nanocrystals changes with composition; 3. The uniform distribution of metal ions in the alloy nanocrystals is revealed. Methods: 1. Co_xNi_ (1-x) O alloy nanocrystals were prepared by the alcoholysis reaction of metal carboxylates under the action of “ligand protection” of lithium stearate; 2. Transmission electron microscopy, X-ray The morphology, crystal structure, composition and valence of metal ions of Co_xNi_ (1-x) O alloy nanocrystals were studied by means of diffraction, atomic emission spectroscopy and X-ray photoelectron spectroscopy. Conclusion: 1.High quality Co_xNi_ (1-x) O (x? [0,1]) alloy nanocrystals were successfully prepared.2. The morphology and crystal structure of Co_xNi_ (1-x) O alloy nanocrystals were found. With the increase of the concentration of cobalt ions in nanocrystals, the transition from NiO to CoO features tends to appear.3. The elemental scanning of single nanocrystals of Co_xNi_ (1-x) O alloy reveals the uniform distribution of metal ions in nanocrystals distributed.