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材料工程  2010 

NiO包覆Ni纳米颗粒的制备及其氧化特性研究

, PP. 89-93

Keywords: NiO包覆,纳米颗粒,壳核结构,钝化,氧化特性

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Abstract:

通过对直流电弧等离子体制备的Ni纳米颗粒钝化处理得到NiO包覆Ni纳米颗粒.并对试样的组成成分、形貌、晶体结构、粒度和氧化特性采用高分辨透射电子显微镜(HRTEM)、X射线衍射(XRD)、透射电子显微镜(TEM)和选区电子衍射(SAED)、热重和差示扫描量热分析仪(TGA/DSC)等手段进行分析.结果表明经过表面钝化处理的NiO包覆Ni纳米颗粒具有明显的核-壳结构,内核为纳米Ni,外壳为NiO氧化物.颗粒呈球形,粒度均匀,分散性良好,粒径分布在20~70nm范围内,平均粒径为44nm,壳层氧化膜的厚度为5~8nm.壳核结构防止了纳米Ni颗粒的进一步氧化和团聚.

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