Nano Archive

Isolation of single-walled carbon nanotube enantiomers by density differentiation

Green, Alexander A. and Duch, Matthew C. and Hersam, Mark C. (2009) Isolation of single-walled carbon nanotube enantiomers by density differentiation. Nano Research, 2 (1). pp. 69-77.

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Current methods of synthesizing single-walled carbon nanotubes (SWNTs) result in racemic mixtures that have impeded the study of left- and right-handed SWNTs. Here we present a method of isolating different SWNT enantiomers using density gradient ultracentrifugation. Enantiomer separation is enabled by the chiral surfactant sodium cholate, which discriminates between left- and right-handed SWNTs and thus induces subtle differences in their buoyant densities. This sorting strategy can be employed for simultaneous enrichment by handedness and roll-up vector of SWNTs having diameters ranging from 0.7 to 1.5 nm. In addition, circular dichroism of enantiomer refined samples enables identification of high-energy optical transitions in SWNTs.

Item Type:Article
Uncontrolled Keywords:Carbon nanotube, separation, handedness, enantiomer, optical activity, chirality
Subjects:Physical Science > Nanophysics
Analytical Science > Metrology and standards in nanotechnology
ID Code:3390
Deposited By:Lesley Tobin
Deposited On:16 Jan 2009 15:45
Last Modified:16 Jan 2009 16:08

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