金属碳纳米管的选择性制备
Selective production of metallic carbon nanotubes
摘要：
在这份报告中，我们讨论是否最佳的电场，以促进扶手椅型纳米管（金属字符）的生长，使用以前的Huckel-Poisson方法评估可以应用在一个现实的系统中的纳米管的尖端。通过对鞘层的外电场和纳米管的横截面的设定，我们估计了鞘层边缘的有效面积。由于在我们之前的研究中已经确定了外电场引起的纳米管中的电荷分布，我们通过求解泊松方程得到了纳米管外的电场分布，并阐明了电场线的结构。通过确定有效面积，我们显示了催化剂金属的最佳间隔，这是必要的选择性生长的金属纳米管。当纳米管在生长的初始阶段厚地生长时，不能将强电场施加到管的尖端。随着管的生长和管长的增加，我们发现最佳电场减小。为了保持尖端的化学活性，必须降低鞘电场。我们估计了鞘场随管长的减小率。
英文摘要：
In this report, we discuss whether the optimal electric field to promote the growth of armchair- type nanotubes (metallic character) evaluated using the previous Huckel-Poisson method can be applied at the tip of a nanotube in a realistic system. Setting the cross-section of a nanotube and the external field by the sheath, we estimate an effective area at the sheath edge. Since the electric charge distribution in a nanotube caused by the external electric field was determined in our previous study, we obtained the electric field distribution out of a nanotube by solving the Poisson equation and clarified the structure of the electric field lines. By determining the effective area, we show the optimal interval of the catalyst metal, which is necessary to selectively grow the metallic nanotubes. When nanotubes grow thickly during the initial stage of growth, a strong electric field cannot be applied to the tips of the tubes. As a tube grows and the tube length increases, we found that the optimal electric field decreased. To maintain the chemical activity at the tip, the sheath electric field must be decreased. We estimated the decreasing rate of the sheath field to the tube length.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
