Excimer laser ablation of graphite: The enhancement of carbon dimer formation
Excimer laser ablation of graphite: The enhancement of carbon dimer formation
复制标题
石墨的准分子激光烧蚀：增强碳二聚体的形成
DOI：
10.1016/j.apsusc.2018.06.217
复制
发表时间：
2018
影响因子：
6.7
通讯作者：
C. Focsa
中科院分区：
文献类型：
--
作者：
C. Ursu;P. Nica;C. Focsa
由激光烧蚀产生的碳等离子体在高电流兴趣的纳米结构材料（纳米管，纳米线，石墨烯）的合成或类金刚石薄膜的沉积中具有重要的应用。了解这些瞬态等离子体在各种实验配置中的基本方面有助于优化这些合成/沉积过程。本文报道了准分子激光产生的碳等离子体动力学的综合研究，包括快速摄影，空间和时间分辨光学发射光谱，法拉第杯离子电流测量，烧蚀坑深度剖面。发射羽状物的一个特殊的v型形状被证明和解释了三个等离子体结构的相互作用，这些等离子体结构起源于目标上激光光斑的不同辐照区域。这些结构的相互作用也被认为有利于提高碳二聚体的生产，主要是通过三体重组，其距离明显高于先前文献报道的距离，这可以为高质量碳基纳米结构的高效沉积找到技术应用。
Carbon plasmas produced by laser ablation can have important applications in the synthesis of nanostructured materials of high current interest (nanotubes, nanowires, graphene) or the deposition of diamond-like thin films. Understanding the fundamental aspects of such transient plasmas in various experimental configurations is useful for optimization of these synthesis/deposition processes. We report here a comprehensive study on the dynamics of an excimer laser produced carbon plasma, including fast photography, space- and time-resolved optical emission spectroscopy, Faraday cup ion current measurements, ablated crater depth profiling. A peculiar V-like shape of the emitting plume is evidenced and explained by the interaction of three plasma structures originating in distinct irradiance areas of the laser spot on the target. The interaction of these structures is also thought to favor an enhanced carbon dimer production, mainly through three-body recombination, at distances significantly higher than previously reported in the literature, which can find technological applications for the efficient deposition of high quality carbon-based nanostructures.