Journal
NANO RESEARCH
Volume 2, Issue 1, Pages 69-77Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-009-9006-y
Keywords
Carbon nanotube; separation; handedness; enantiomer; optical activity; chirality
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Funding
- U. S. Army Telemedicine and Advanced Technology Research Center [DAMD17-05-1-0381]
- National Science Foundation [DMR-0520513, EEC-0647560, DMR-0706067]
- Natural Sciences and Engineering Research Council of Canada
- Alfred P. Sloan Research Fellowship
- NSF-NSEC
- NSF-MRSEC
- Keck Foundation
- State of Illinois
- Northwestern University
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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.
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