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采用直流电弧放电等离子体技术成功制备了碳包覆NiO(NiO@C)纳米颗粒,并对样品的形貌、晶体结构、粒度、比表面积和孔结构采用高分辨透射电子显微镜、X射线衍射、X射线能量色散分析谱仪、拉曼散射光谱和N_2吸-脱附等测试手段进行了分析。实验结果表明:直流电弧等离子体技术制备的NiO@C纳米颗粒具有典型的核壳结构,内核为面心立方结构的NiO纳米颗粒,外壳为碳层。颗粒形貌主要为立方体结构,粒度均匀,分散性良好,粒径分布在30~70nm范围,平均粒径为50nm,外壳碳层的厚度为5nm。NiO@C纳米颗粒BET比表面积为28m~2/g,等效直径为46nm,与TEM和XRD测得的结果基本一致。Raman光谱说明样品中碳包覆层的石墨化程度较低,发生了红移现象。
The carbon coated NiO (NiO @ C) nanoparticles were successfully prepared by DC arc plasma discharge. The morphology, crystal structure, particle size, specific surface area and pore structure of the samples were characterized by high resolution transmission electron microscopy, X-ray diffraction, X-ray energy dispersive spectroscopy, Raman scattering spectroscopy and N 2 adsorption-desorption and other testing methods were analyzed. The experimental results show that the NiO @ C nanoparticles prepared by DC arc plasma technology have a typical core-shell structure, the core is a face-centered cubic NiO nanoparticle, and the shell is a carbon layer. Particle morphology is mainly cubic structure, uniform particle size, good dispersion, particle size distribution in the range of 30 ~ 70nm, the average particle size of 50nm, the shell carbon layer thickness of 5nm. NiO @ C nanoparticles BET specific surface area of 28m ~ 2 / g, the equivalent diameter of 46nm, and TEM and XRD measured results are basically the same. Raman spectroscopy shows that the carbon coating in the sample has a low degree of graphitization and a red shift occurs.