Nano Archive

Optically active single-walled carbon nanotubes

Peng, Xiaobin and Komatsu, Naoki and Bhattacharya, Sumanta and Shimawaki, Takanori and Aonuma, Shuji and Kimura, Takahide and Osuka, Atsuhiro (2007) Optically active single-walled carbon nanotubes. NATURE NANOTECHNOLOGY, 2 (6). pp. 361-365.

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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.

Item Type:Article
Subjects:Physical Science > Nano objects
Material Science > Nanostructured materials
Material Science > Nanochemistry
ID Code:3093
Deposited By:Anuj Seth
Deposited On:13 Jan 2009 10:48
Last Modified:20 Jan 2009 14:38

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