Nitrogen-mediated carbon nanotube growth: Diameter reduction, metallicity, bundle dispersability, and bamboo-like structure formation
Nitrogen-mediated carbon nanotube growth: Diameter reduction, metallicity, bundle dispersability, and bamboo-like structure formation
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DOI：
10.1021/nn700143q
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发表时间：
2007-11-01
期刊：
影响因子：
17.1
通讯作者：
Terrones, Mauricio
中科院分区：
文献类型：
--
作者：
Sumpter, Bobby G.;Meunier, Vincent;Terrones, Mauricio
碳纳米管在氮存在下的生长一直是许多实验研究的主题，引发了关于氮在各种结构特征形成中的作用的激烈辩论，这些结构特征包括长度缩短、直径减小和竹子状的多层纳米管。本文用实验和理论相结合的方法阐明了这些特征的起源，表明N在生长过程中起着表面活性剂的作用。N掺杂促进了较小管径的形成。它还可以促进管子的闭合，包括相对大量的N原子进入管子晶格，导致竹子状结构。我们的发现表明，这种机制与管手性无关，并提出了一种简单的方法来控制竹子状纳米管的生长。
Carbon nanotube growth in the presence of nitrogen has been the subject of much experimental scrutiny, sparking intense debate about the role of nitrogen in the formation of diverse structural features, including shortened length, reduced diameters, and bamboo-like multilayered nanotubules. In this paper, the origin of these features is elucidated using a combination of experimental and theoretical techniques, showing that N acts as a surfactant during growth. N doping enhances the formation of smaller diameter tubes. It can also promote tube closure which includes a relatively large amount of N atoms into the tube lattice, leading to bamboo-like structures. Our findings demonstrate that the mechanism is independent of the tube chirality and suggest a simple procedure for controlling the growth of bamboo-like nanotube morphologies.