Roles of Laser Light and Heat in Formation of Single-Wall Carbon Nanotubes by Pulsed Laser Ablation of CxNiyCoy Targets at High Temperature
Roles of Laser Light and Heat in Formation of Single-Wall Carbon Nanotubes by Pulsed Laser Ablation of CxNiyCoy Targets at High Temperature
复制标题
高温脉冲激光烧蚀 CxNiyCoy 靶材形成单壁碳纳米管时激光和热的作用
DOI：
10.1021/jp983262k
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发表时间：
1998
影响因子：
3.3
通讯作者：
S. Iijima
中科院分区：
文献类型：
--
作者：
M. Yudasaka;T. Ichihashi;S. Iijima
使用Nd：YAG脉冲激光器在CxNiyCoy靶（x，y = 98.8，0.6或91，4.5）上进行激光烧蚀。比较了激光束强度和大气温度对靶表面结构和碳沉积物结构的影响。这些影响被发现是相似的，除了以下：直径没有变化时，激光束强度的变化很大，而它减少，其分布范围扩大，随着大气温度的降低。从靶中排出的碳的量主要由激光束强度决定，从靶中去除的Ni和Co的量受激光束强度和大气温度的影响。这些结果表明，大气温度控制碳的化学反应，通过该化学反应形成单壁碳纳米管，而激光束强度控制的过程，通过该过程，碳，镍，钴从目标被驱逐。
Laser ablations were performed on CxNiyCoy targets (x, y = 98.8, 0.6 or 91, 4.5) using a Nd:YAG pulsed laser. Influences of the laser-beam intensity and atmospheric temperature on the structures of target surfaces and carbonaceous deposits were compared. These influences were found to be similar except for the following; the diameter did not change enormously when the laser-beam intensity was varied, while it decreased and its distribution range was widened as the atmospheric temperature decreased. The quantity of carbon expelled from the target was determined mainly by the laser-beam intensity, and the quantity of Ni and Co removed from the target was affected by both the laser-beam intensity and the atmospheric temperature. These results indicate that the atmospheric temperature controls the chemical reaction of carbon by which single-wall carbon nanotubes are formed, while the laser-beam intensity controls the process by which carbon, Ni, and Co are expelled from the target.