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Large-scale synthesis of Ni-Ag core-shell nanoparticles with magnetic, optical and anti-oxidation properties

机译：具有磁性，光学和抗氧化特性的Ni-Ag核壳纳米粒子的大规模合成

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摘要

The large-scale synthesis and characterization of Ni-core/Ag-shell (Ni@Ag) nanoparticles by the successive hydrazine reduction of nickel chloride and silver nitrate in ethylene glycol using polyethyleneimine (PEI) as a protective agent are described. The resultant Ni@Ag nanoparticles had a mean core diameter of 6.2 nm and a shell thickness of 0.85 nm, without significant change in the nickel concentration of 0.25 - 25 mM for the Ag coating. Also, both Ni cores and Ag nanoshells had an fcc structure and PEI was capped on the particle surface. X-ray photoelectron spectroscopy analysis confirmed that the Ni cores were fully covered by Ag nanoshells. In addition, the Ni@Ag nanoparticles exhibited a characteristic absorption band at 430 nm and were nearly superparamagnetic. Based on the weight of Ni cores, the saturation magnetization (M-s), remanent magnetization (M-r) and coercivity (H-c) were obtained as 17.2 emu g(-1), 4.0 emu g(-1) and 81 Oe, respectively. Furthermore, the resultant Ni@Ag nanoparticles exhibited better anti-oxidation properties than Ni nanoparticles did due to the protection of the Ag nanoshells.
机译：描述了通过使用聚乙烯亚胺（PEI）作为保护剂，将乙二醇中的氯化镍和硝酸银连续肼还原，大规模合成和表征Ni-Core / Ag-shell（Ni @ Ag）纳米粒子。所得的Ni @ Ag纳米颗粒的平均芯直径为6.2nm，壳厚度为0.85nm，对于Ag涂层，镍浓度为0.25-25mM没有明显变化。而且，Ni核和Ag纳米壳都具有fcc结构，PEI覆盖在颗粒表面。 X射线光电子能谱分析证实，Ni核被Ag纳米壳完全覆盖。此外，Ni @ Ag纳米颗粒在430 nm处表现出特征吸收带，几乎是超顺磁性的。基于镍芯的重量，饱和磁化强度（M-s），剩磁强度（M-r）和矫顽力（H-c）分别为17.2 emu g（-1），4.0 emu g（-1）和81 Oe。此外，由于Ag纳米壳的保护，所得的Ni @ Ag纳米颗粒比Ni纳米颗粒表现出更好的抗氧化性能。

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