CAJ | 학술논문

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.
통과대직류전호등리자체제비적Ni납미과립둔화처리득도NiO포복Ni납미과립.병대시양적조성성분、형모、정체결구、립도화양화특성채용고분변투사전자현미경(HRTEM)、X사선연사(XRD)、투사전자현미경(TEM)화선구전자연사(SAED)、열중화차시소묘량열분석의(TGA/DSC)등수단진행분석.결과표명:경과표면둔화처리적NiO포복Ni납미과립구유명현적핵-각결구,내핵위납미Ni,외각위NiO양화물.과립정구형,립도균균,분산성량호,립경분포재20～70nm범위내,평균립경위44nm,각층양화막적후도위5～8nm.각핵결구방지료납미Ni과립적진일보양화화단취.
NiO encapsulated Ni nanoparticles were prepared by direct current arc plasma method and subsequently passivation.The chemical composition,morphology, crystal microstructure, particle size and oxidization resistance of the product were analyzed using the high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and the corresponding selected-area electron diffraction (SAED), thermogravimetric analyzer (TGA) and diffirential scanning calorimeter (DSC).The results showed that the NiO encapsulated Ni nanoparticles with clear core-shell structure.The core is consisted of particles of Ni,while the shell is consisted of NiO.The particle size of the samples was homogeneously distributed with spherical shape and well dispersed, the particle size distribution ranging from 20-70nm with the average particle size about 44nm and the thickness of the shell 5-8nm.The core-shell structure can prevent Ni nanoparticles from oxidation and agglomeration.