Solution-Phase Extraction of Ultrathin Inner Shells from Double-Wall Carbon Nanotubes
Solution-Phase Extraction of Ultrathin Inner Shells from Double-Wall Carbon Nanotubes
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DOI：
10.1021/nn1015665
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发表时间：
2010-10-01
期刊：
影响因子：
17.1
通讯作者：
Shinohara, Hisanori
中科院分区：
文献类型：
--
作者：
Miyata, Yasumitsu;Suzuki, Marie;Shinohara, Hisanori
本文提出了一种高效的液相法提取双壁碳纳米管（DWCNTs）内壳层的方法。通过在含有表面活性剂的水中用剧烈超声处理切割DWCNT来实现从外壳中提取内壳。提取的壳是完全隔离的单壁碳纳米管（SWCNTs），可以使用密度梯度超离心分离。使用高分辨率透射电子显微镜的统计分析表明，富集的单壁碳纳米管与窄直径（0.62-1.0 nm）高达100%，实现了从高纯度DWCNTs。此外，具有0.62 nm直径的（5，4）SWCNT被集中。我们的研究结果提供了一种新的方法来获得非常窄，高度隔离的单壁碳纳米管与超净的表面，还没有得到在传统的合成方法。
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.