Scrolls and nested tubes in multiwall carbon nanotubes
Scrolls and nested tubes in multiwall carbon nanotubes
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DOI：
10.1016/s0008-6223(02)00050-7
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发表时间：
2002-01-01
期刊：
影响因子：
10.9
通讯作者：
Tománek, D
中科院分区：
文献类型：
--
作者：
Lavin, JG;Subramoney, S;Tománek, D
最近对多壁碳纳米管（MWCNTs）进行的高分辨率透射电子显微镜（HREM）研究揭示了一类类似于晶体中刃型位错的缺陷。据信这些缺陷标志着从一侧的卷曲结构到另一侧的嵌套管结构的转变。在管的一侧，层间距变得不规则。对管的螺旋性的分析表明，直径和螺旋性之间存在很强的相关性。这表明，与石墨或乱层碳的情况不同，管的组织原理不是范德华力，而是螺旋性的保持。基于这些观察结果和总能量计算，作者推测石墨烯单分子层最初形成卷曲结构，随后通过缺陷的发展转变为多壁纳米管。因此，卷曲结构和嵌套管在单个多壁碳纳米管内共存。（C）2002年由爱思唯尔科学有限公司出版
Recent high-resolution transmission electron microscopy (HREM) studies of multiwalled carbon nanotubes (MWCNTs) reveal a class of defects analogous to edge dislocations in a crystal. These defects are believed to mark the transition from scrolls on one side to nested tubes on the other. On the tube side, layer spacing becomes irregular. Analysis of the helicity of the tubes shows a strong correlation between diameter and helicity. This suggests that the organizing principle for the tubes is not Van der Waals forces, as in the case of graphite or tUrbostratic carbon, but preservation of helicity. Based on these observations and total energy calculations, the authors speculate that graphene monolayers initially form scrolls and subsequently transform into multiwall nanotubes through the progression of defects. Scrolls and nested tubes thus coexist within a single MWNT. (C) 2002 Published by Elsevier Science Ltd.