Selection of carbon nanotubes with specific chiralities using helical assemblies of flavin mononucleotide
Selection of carbon nanotubes with specific chiralities using helical assemblies of flavin mononucleotide
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DOI：
10.1038/nnano.2008.148
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发表时间：
2008-06-01
影响因子：
38.3
通讯作者：
Papadimitrakopoulos, Fotios
中科院分区：
文献类型：
--
作者：
Ju, Sang-Yong;Doll, Jonathan;Papadimitrakopoulos, Fotios
单壁碳纳米管的手性影响其许多物理和电子性质。目前的生产方法导致混合手性的纳米管，因此容易提取单壁碳纳米管的特定手性是其有效利用的重要步骤。在这里，我们表明，黄素monopoltide，一个共同的氧化还原辅因子，包裹在单壁碳纳米管的螺旋图案，赋予有效的个性化和手性选择。相邻黄素部分之间的协同氢键导致螺旋带的形成，其通过黄素单肽和下面的石墨烯壁之间的同心π-π相互作用围绕单壁碳纳米管组织。螺旋黄素单肽组装的强度强烈依赖于纳米管手性。在表面活性剂的存在下，黄素单肽组装体被破坏并被表面活性剂胶束取代而不沉淀。黄素单核苷酸肽组装体对（8，6）-单壁碳纳米管的显著更高的亲和力导致来自具有宽直径分布的纳米管样品的85%手性富集。
The chirality of single-walled carbon nanotubes affects many of their physical and electronic properties. Current production methods result in nanotubes of mixed chiralities, so facile extraction of specific chiralities of single-walled carbon nanotubes is an important step in their effective utilization. Here we show that the flavin mononucleotide, a common redox cofactor, wraps around single-walled carbon nanotubes in a helical pattern that imparts efficient individualization and chirality selection. The cooperative hydrogen bonding between adjacent flavin moieties results in the formation of a helical ribbon, which organizes around single-walled carbon nanotubes through concentric pi-pi interactions between the flavin mononucleotide and the underlying graphene wall. The strength of the helical flavin mononucleotide assembly is strongly dependent on nanotube chirality. In the presence of a surfactant, the flavin mononucleotide assembly is disrupted and replaced without precipitation by a surfactant micelle. The significantly higher affinity of the flavin mononucleotide assembly for (8,6)-single-walled carbon nanotubes results in an 85% chirality enrichment from a nanotube sample with broad diameter distribution.