Rümmeli Mark H, Kramberger Christian, Löffler Markus, Jost Oliver, Bystrzejewski Michał, Grüneis Alexander, Gemming Thomas, Pompe Wolfang, Büchner Bernd, Pichler Thomas
IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany, Dresden University of Technology, D-01062 Dresden, Germany.
J Phys Chem B. 2007 Jul 19;111(28):8234-41. doi: 10.1021/jp072556f. Epub 2007 Jun 20.
In this Article, we describe a carbon nanotube formation model in which sp2 carbon hemispheres form the embryonic caps from which a nanotube can grow. This requirement leads to a single wall carbon nanotube formation window concomitant with our systematic experimental findings, which show upper and lower diameter limits. Further, the successful formation of a nucleation cap (hemisphere) is governed by catalyst particle volume to surface area considerations. Single wall carbon nanotubes are only obtained when both the nanotube formation window and the precipitating catalyst size distribution cross over. The extent to which these two windows overlap establishes the mean diameter and diameter distribution of the obtained single wall carbon nanotubes.
在本文中，我们描述了一种碳纳米管形成模型，其中sp2碳半球形成胚胎帽，纳米管可从该帽生长。这一要求导致了一个单壁碳纳米管形成窗口，与我们系统的实验结果相符，实验结果显示了直径的上限和下限。此外，成核帽（半球）的成功形成受催化剂颗粒体积与表面积因素的控制。只有当纳米管形成窗口和沉淀催化剂尺寸分布交叉时，才能获得单壁碳纳米管。这两个窗口重叠的程度决定了所得单壁碳纳米管的平均直径和直径分布。
