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

我们使用去年开发的自动生产和净化系统批量生产高质量的低碳纳米管。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纸盒来净化DWNTs。目前所生产的低碳纳米管以其结构均匀、缺陷密度低而被认为是一种标准。我们制作了C60豆荚，测量了这些高质量的低碳纳米管的光致发光，并观察了层间相互作用。从DWNTs中产生的C60豆荚表明，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同一位置上存在缺陷的概率应该很低。它们的性质是通过光致发光观察到的，显示了内层的光发射和从内层到外层的能量传递，这些相互作用通过STM更精确地研究了。观察到的STM图像显示，由于层相互作用，在DWNTs的外层有云纹图案。这一观察结果是对云纹图案的首次揭示，说明了层间相互作用仍然很明显，尽管它们的层间距更宽，而且内层可以通过外层的STM观察来研究。我们现在正在分析图像以确定内层和外层的结构

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