Optically active single-walled carbon nanotubes
Optically active single-walled carbon nanotubes
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DOI：
10.1038/nnano.2007.142
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发表时间：
2007-06-01
影响因子：
38.3
通讯作者：
Osuka, Atsuhiro
中科院分区：
文献类型：
--
作者：
Peng, Xiaobin;Komatsu, Naoki;Osuka, Atsuhiro
单壁碳纳米管(SWNTs)的光学、电学和力学性能在很大程度上取决于其结构，而均匀材料的批量可获得性是扩大其技术应用的关键。自从首次制备(2，3)以来，人们在选择性合成和分离具有特定结构的单壁碳纳米管方面做了大量的工作。制备的手性单壁碳纳米管样品含有等量的左旋和右旋螺旋结构，但很少有人注意到这些不可叠加的镜像形式的分离，即光学异构体。在这里，我们表明，光学活性的单壁碳纳米管样品可以通过优先从商业样品中提取右手或左手的单壁碳纳米管来获得。手性‘山墙型’双卟啉分子以不同的亲和力结合到左旋和右旋螺旋纳米管异构体上，形成稳定性不同的络合物，这些络合物很容易分离。值得注意的是，双卟啉随后可以从络合物中释放出来，以提供光学浓缩的单壁碳纳米管。
The optical, electrical and mechanical properties of single-walled carbon nanotubes (SWNTs) are largely determined by their structures, and bulk availability of uniform materials is vital for extending their technological applications(1). Since they were first prepared(2,3), much effort has been directed toward selective synthesis and separation of SWNTs with specific structures. As-prepared samples of chiral SWNTs contain equal amounts of left- and right-handed helical structures', but little attention has been paid to the separation of these non-superimposable mirror image forms, known as optical isomers. Here, we show that optically active SWNT samples can be obtained by preferentially extracting either right- or left-handed SWNTs from a commercial sample. Chiral 'gable-type' diporphyrin molecules bind with different affinities to the left- and right-handed helical nanotube isomers to form complexes with unequal stabilities that can be readily separated. Significantly, the diporphyrins can be liberated from the complexes afterwards, to provide optically enriched SWNTs.