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. ISSN 1998-0124 (Print) 1998-0000 (Online)
Official URL: http://www.springerlink.com/content/14422828138k85...
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.
|Subjects:||Physical Science > Nanophysics|
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Physics|
Faculty of Engineering, Science and Mathematics > School of Chemistry
|Deposited On:||30 Mar 2010 05:25|
|Last Modified:||30 Mar 2010 05:25|
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