Nano Research

, Volume 2, Issue 1, pp 69–77

Isolation of single-walled carbon nanotube enantiomers by density differentiation

Authors

  • Alexander A. Green
    • Department of Materials Science and Engineering and Department of ChemistryNorthwestern University
  • Matthew C. Duch
    • Department of Materials Science and Engineering and Department of ChemistryNorthwestern University
    • Department of Materials Science and Engineering and Department of ChemistryNorthwestern University
Open AccessResearch Article

DOI: 10.1007/s12274-009-9006-y

Cite this article as:
Green, A.A., Duch, M.C. & Hersam, M.C. Nano Res. (2009) 2: 69. doi:10.1007/s12274-009-9006-y

Abstract

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.

https://static-content.springer.com/image/art%3A10.1007%2Fs12274-009-9006-y/MediaObjects/12274_2009_9006_Fig1_HTML.jpg

Keywords

Carbon nanotube separation handedness enantiomer optical activity chirality

Supplementary material

12274_2009_9006_MOESM1_ESM.pdf (290 kb)
Supplementary material, approximately 292 KB.

Copyright information

© Tsinghua University Press and Springer Berlin Heidelberg 2009