Department of Chemistry, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan.
ACS Nano. 2010 Oct 26;4(10):5807-12. doi: 10.1021/nn1015665.
We present an efficient method to extract inner shells of double-wall carbon nanotubes (DWCNTs) in liquid phase. The extraction of inner from outer shells is achieved by cutting the DWCNTs with vigorous sonication in water containing surfactants. The extracted shells are perfectly isolated single-wall carbon nanotubes (SWCNTs) and can be separated using density gradient ultracentrifugation. Statistical analysis using high-resolution transmission electron microscopy reveals that the enrichment of SWCNTs with narrow diameter (0.62-1.0 nm) up to 100% is achieved from highly pure DWCNTs. Furthermore, the (5,4) SWCNTs, which have the diameter of 0.62 nm, are concentrated. Our findings provide a novel way to obtain very narrow, highly isolated SWCNTs with ultraclean surface that have not been obtained in conventional synthesis methods.
我们提出了一种在液相中提取双壁碳纳米管（DWCNT）内壳的有效方法。通过在含有表面活性剂的水中剧烈超声处理来切割 DWCNT，可以实现从外壳中提取内壳。提取出的壳是完美分离的单壁碳纳米管（SWCNT），可以使用密度梯度超速离心进行分离。使用高分辨率透射电子显微镜进行的统计分析表明，从高纯度的 DWCNT 中可以实现直径为 0.62-1.0nm 的窄直径 SWCNT 的 100%富集。此外，（5,4）SWCNT 被浓缩，其直径为 0.62nm。我们的发现为获得具有超净表面的非常窄且高度分离的 SWCNT 提供了一种新方法，而这些 SWCNT 是在传统合成方法中无法获得的。
