Development of a large scale production and purification system for high-quality and highly pure double wall carbon nanotubes

通过使用去年开发的自动化生产和纯化系统，我们批量生产了高质量的DWNT。该系统利用Ha和空气氧化分别通过去除金属催化剂和无定形碳来净化DWNTs。所生产的DWNTs现在被视为具有结构均匀性和低缺陷密度的标准。我们制备了C60 peapod，测量了这些高质量DWNTs的光致发光并观察了其层间相互作用。从DWNTs生产C60豆荚澄清了C60不是从HQDWNTs壁上的缺陷进入，而是从它们的开口端进入，因为在内层和外层的相同位置处具有缺陷的概率应该相当低。它们的性质观察的光致发光显示的光发射的内层和能量转移Rom的内层到外层。这些相互作用更精确地研究由STM观察到的STM图像显示莫尔图案的外层的DWNTs起源于层间的相互作用。这一观察结果是莫尔条纹的最新揭示，阐明了即使它们具有更宽的层距，层间相互作用仍然明显，并且可以通过STM观察外层来研究内层。

We have mass-produced high-quality DWNTs by using the automatic production and purification system developed in the last year. This system utilizes Ha and air oxidation to purify DWNTs by eliminating metal catalysts and amorphous carton, respectively. The produced DWNTs are now regarded as a standard with their structural homogeneity and low defect density. We have produced C60 peapods, measured photoluminescence and observed interlayer interaction of these high-quality DWNTs. The production of C60 peapods from DWNTs clarified that C60 enters not from defects on the wall of HQDWNTs but from their open ends because the probability should be quite low to have defects at the same position on the inner and the outer layers. Their properties are observed by the photoluminescence showing photo emission of the inner layer and the energy transfer Rom the inner layer to the outer layer These interaction is investigated more precisely by STM The observed STM images show moire patters on the outer layer of DWNTs originating from the layer interaction. This observation is the lust disclosure of the moire pattern clarifying that the layer interaction is still apparent even though they have much wider layer distance and that the inner layer can be investigated by STM observation through the outer layer We am now analyzing the images to determine the structures of the inner and the outer layers