Chromatographic purification of soluble single-walled carbon nanotubes (s-SWNTs)
Chromatographic purification of soluble single-walled carbon nanotubes (s-SWNTs)
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DOI：
10.1021/ja0024439
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发表时间：
2001-01-31
影响因子：
15
通讯作者：
Haddon, RC
中科院分区：
文献类型：
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作者：
Niyogi, S;Hu, H;Haddon, RC
虽然单壁碳纳米管(单壁碳纳米管)的科学和技术潜力引起了对这一领域的相当大的关注，1但由于难以制备足够数量的高质量材料，目前该领域的进展受到阻碍。目前的提纯方法依赖于过滤、离心和层析技术来分离纳米管和残留的杂质，这些杂质通常由微量的催化剂、纳米颗粒和无定形碳组成，所制备的单壁碳纳米管(AP-SWNTs)经过酸或氧化剂处理后。2-8在我们发现了一种溶解短的单壁碳纳米管(长度为100-300 nm)的方法后，我们预计溶解的物质将通过溶解过程得到净化。9、10虽然部分满足了这一期望，但现在很明显，溶解过程也将处理后的单壁碳纳米管中存在的一些杂质溶解。由于该方法的强大功能以及富勒烯的提纯在很大程度上依赖于这一技术，因此层析对纳米管的提纯很有吸引力。然而，与富勒烯11、12不同的是，大多数形式的碳纳米管不溶于有机溶剂。因此，以前的层析纯化纳米管依赖于以水为流动相的表面活性剂稳定的分散体的尺寸排除层析，尽管有报道称包裹着聚苯乙炔的多壁碳纳米管通过凝胶渗透色谱(GPC)柱。在本论文中，我们报道了在我们的纳米管溶解过程中，可溶的单壁碳纳米管从被溶解的颗粒物中分离出来。9、10
While the scientific and technological potential of single-walled carbon nanotubes (SWNTs) has attracted considerable attention to this area, 1 progress in the field is currently hampered by the difficulty of preparing sufficient quantities of high-quality materials. Present purification methods rely on filtration, centrifugation, and chromatographic techniques to separate the nanotubes from the residual impurities which usually consist of trace amounts of catalyst, nanoparticles, and amorphous carbon after the asprepared SWNTs (AP-SWNTs) have been treated with acid or oxidizing reagents. 2-8After we discovered a method for the dissolution of short SWNTs (100-300 nm in length2), we expected that the dissolved materials would be purified by the dissolution process. 9, 10 Although this expectation is partially fulfilled, it is now clear that the dissolution process also takes into solution some of the impurities that are present in the processed SWNTs. Chromatography is attractive for nanotube purification because of the power of the method and the fact that fullerene purification has relied heavily on this technique. Unlike the fullerenes, 11, 12 however, most forms of carbon nanotubes are insoluble in organic solvents. Thus previous chromatographic purifications of nanotubes have relied on size exclusion chromatography of surfactantstabilized dispersions with water as the mobile phase, 5, 6 although there is a report in which poly (phenylacetylene) wrapped MWNTs were passed through a gel permeation chromatography (GPC) column. 7 In the present paper we report the separation of soluble SWNTs from the particulate matter that is solubilized in our nanotube dissolution process. 9, 10