Abstract A non-thermal plasma source based on magnetically stabilized gliding arc discharge (MSGAD) was used to prepare carbon nanoparticles via methane decomposition. Spherical carbon nanoparticles (SCNs), few-layer graphene nanoflakes (GNFs), and nitrogen-doped carbon nanoparticles were obtained. The results showed that the product microstructure was influenced by the buffer gas. In pure methane and argon, the products were a mixture of SCNs and GNFs. In helium and hydrogen, all products were highly crystalline GNFs with low defects, few layers, large BET surface areas, and excellent thermal stability. Under a nitrogen atmosphere, nitrogen-doped nanoparticles were formed, and the products were a mixture of GNFs, disordered graphitic layers, and tiny spots similar to carbon dots. The formation of GNFs was possibly related to the high input power and abundant hydrogen atoms, while the complex product morphology obtained under a nitrogen atmosphere was likely caused by the incorporation of nitrogen atoms.

中文翻译：

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在非热等离子体工艺中合成碳纳米颗粒

摘要 使用基于磁稳定滑动电弧放电 (MSGAD) 的非热等离子体源通过甲烷分解制备碳纳米颗粒。获得了球形碳纳米粒子 (SCN)、少层石墨烯纳米薄片 (GNF) 和氮掺杂碳纳米粒子。结果表明，产品的微观结构受缓冲气体的影响。在纯甲烷和氩气中，产物是 SCN 和 GNF 的混合物。在氦气和氢气中，所有产品都是高度结晶的 GNF，具有低缺陷、少层、大 BET 表面积和出色的热稳定性。在氮气气氛下，形成了掺氮纳米粒子，其产物是 GNF、无序石墨层和类似于碳点的微小斑点的混合物。