辐照单壁碳纳米管中fragmentation的动力学及多空位的产生
Dynamics of fragmentation and multiple vacancy generation in irradiated single-walled carbon nanotubes
摘要：
从质谱的结果溅射从Cs+辐照的单壁碳纳米管（SWCNTs）作为能量和剂量的函数的簇确定的性质所产生的损害的形式，多个空位生成。对于所有Cs+能量的原始SWCNT，C2是最主要的物种，其次是C3，C4和C1。实验分三个阶段进行：第一阶段，改变Cs+能量E（Cs+）。在第二阶段期间，在E（Cs+）= 5 keV下连续照射纳米管1，800 s。之后，重复整个序列的照射能量，以区分原始的和重度照射的SWCNT的碎片模式。溅射和归一化的产量确定的定量和相对程度的离子引起的损伤，通过创建双，三重和四重的空缺，单空位是最不受欢迎的。从严重照射的单壁碳纳米管溅射发生不仅从损坏和破碎的纳米管，而且从纳米管间的结构，由于溅射簇的积累而生长。用多壁碳纳米管进行类似的辐照实验;结果证实了C2占主导地位，其次是C3，C4和C1。
英文摘要：
The results from mass spectrometry of clusters sputtered from Cs+ irradiated single-walled carbon nano-tubes (SWCNTs) as a function of energy and dose identify the nature of the resulting damage in the form of multiple vacancy generation. For pristine SWCNTs at all Cs+ energies, C2 is the most dominant species, followed by C3, C4 and C1. The experiments were performed in three stages: in the first stage, Cs+ energy E(Cs+) was varied. During the second stage, the nanotubes were irradiated continuously at E(Cs+) = 5 keV for 1,800 s. Afterwards, the entire sequence of irradiation energies was repeated to differentiate between the fragmentation patterns of the pristine and of heavily irradiated SWCNTs. The sputtering and normalized yields identify the quantitative and relative extent of the ion-induced damage by creating double, triple and quadruple vacancies; the single vacancies are least favored. Sputtering from the heavily irradiated SWCNTs occurs not only from the damaged and fragmented nanotubes, but also from the inter-nanotube structures that are grown due to the accumulation of the sputtered clusters. Similar irradiation experiments were performed with the multi-walled carbon nanotubes; the results confirmed the dominant C2 followed by C3, C4 and C1.
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