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首页> 外文期刊>Applied Surface Science >Plasma characterization and room temperature growth of carbon nanotubes and nano-onions by excimer laser ablation
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Plasma characterization and room temperature growth of carbon nanotubes and nano-onions by excimer laser ablation

机译：准分子激光烧蚀对碳纳米管和纳米洋葱的等离子体表征和室温生长

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摘要

The deposition of carbon nanotubes and carbon nano-onions at room temperature using excimer laser radiation to ablate mixed graphite-metal targets is described. Our deposition conditions are in contrast to other investigations on the pulsed laser deposition of carbon nanotubes that have employed high temperatures and high pressures. We find that the formation of these carbon nanostructures is dependent on the ambient gas employed during ablation. In the presence of O_2 gas, carbon nanotubes and nano-onions are produced, while inert atmospheres such as Ar yield amorphous carbon. High-resolution, in situ, time-resolved emission spectroscopy has been used to track the evolution of species (C_2, C_3, Ni/Co) in the ablation plume. Spectral fits on low and high-resolution spectra reveal that the vibrational-rotational temperatures for C_2 produced in O_2 remain at ～ 5000 K for nearly 20 μs but drop rapidly in Ar. Details of the formation of carbon nanotubes and nano-onions, and in situ time-resolved optical emission spectroscopy are described.
机译：描述了使用准分子激光辐射在室温下沉积碳纳米管和碳纳米洋葱，以烧蚀混合的石墨-金属靶。我们的沉积条件与对采用高温和高压的碳纳米管的脉冲激光沉积的其他研究形成对比。我们发现这些碳纳​​米结构的形成取决于烧蚀过程中使用的环境气体。在O_2气体存在下，会生成碳纳米管和纳米洋葱，而惰性气氛（如Ar）会生成无定形碳。高分辨率，原位，时间分辨发射光谱已用于跟踪消融羽流中物种（C_2，C_3，Ni / Co）的演变。在低分辨率和高分辨率光谱上的光谱拟合显示，O_2中产生的C_2的振动-旋转温度在约5000 K下保持约20μs，而在Ar中迅速下降。描述了碳纳米管和纳米洋葱的形成以及原位时间分辨光发射光谱的详细信息。

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