摘要
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。
Alloying is an effective way to manipulate the composition and physico-chemical properties of functional materials. We demonstrated the syntheses of alloyed CoxNi1-xO nanocrystals using a nonaqueous approach, with x continuously tuned from 0 to 1 by varying the molar ratios of the cobalt precursor in the reagents. The morphological, structural, and compositional properties of the alloyed CoxNi1-xO nanocrystals were characterized by transmission electron microscopy （TEM）, X-ray diffraction （XRD）, inductively coupled plasma atomic emission spectroscopy （ICP-AES）, and energy dispersive X-ray spectroscopy （EDS）. The results showed that the cobalt and nickel atoms were homogeneously distributed in the alloyed nanocrystals. The as-prepared CoxNi1-xO nanocrystals can be applied as the hole-transporting layers in polymer light emitting diodes （PLEDs）. Our study pro- vides a good example for the syntheses of alloyed oxide nanocrystals with continuously tunable composition.
基金
Project supported by the National Natural Science Foundation of China(Nos.91433204 and 51522209)
the Fundamental Research Funds for the Central Universities(No.2015XZZX004-24),China
关键词
合金化
氧化镍
氧化钴
胶体纳米晶
Alloying
Nickel oxide
Cobalt oxide
Colloidal nanocrystals
