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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Catalytic pyrogenation synthesis of C/Ni composite nanoparticles: controllable carbon structures and high permittivities
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Catalytic pyrogenation synthesis of C/Ni composite nanoparticles: controllable carbon structures and high permittivities

机译：碳/镍复合纳米粒子的催化热解合成：可控的碳结构和高介电常数

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Catalytic pyrogenation of methane gas in the presence of Ni nanoparticles was employed to synthesize C/Ni composite nanoparticles at various reaction temperatures. The Ni nanoparticles prepared by the arc-discharge method served as a catalyst to decompose the hydrocarbon molecules and also provided isolated templates for the formation of carbon nanocapsules at 400 and 500 degrees C or multi-walled carbon nanotubes at 600 and 650 degrees C. The generation and growth mechanism of the carbon shells are discussed on the basis of structure evolution. By dispersing the nanoparticles homogeneously into a paraffin matrix, the electromagnetic parameters of the nanoparticles have been investigated in the frequency range 2-18 GHz. The samples exhibit high permittivities varying with the microstructures of the nanoparticles. The relationship between the dielectric properties and diverse carbon structures is indicated. The high permittivities of the nanoparticles are attributed to the better conductivity of the carbon shells and the charge polarizations at the defects or interfaces between metal cores and carbon shells.
机译：在Ni纳米颗粒存在下，甲烷气体的催化热解被用来在各种反应温度下合成C / Ni复合纳米颗粒。通过电弧放电法制备的Ni纳米颗粒用作分解碳氢化合物分子的催化剂，还提供了分离的模板，用于在400和500摄氏度下形成碳纳米胶囊或在600和650摄氏度下形成多壁碳纳米管。在结构演化的基础上探讨了碳壳的产生和生长机理。通过将纳米颗粒均匀地分散到石蜡基质中，已研究了2-18 GHz频率范围内纳米颗粒的电磁参数。样品表现出高的介电常数，随纳米颗粒的微观结构而变化。指出了介电性能和不同碳结构之间的关系。纳米粒子的高介电常数归因于碳壳的更好的导电性以及在金属核与碳壳之间的缺陷或界面处的电荷极化。

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