Abstract Submitted to the ; NT'05-Logo NANOTUBE'05 Conference:

Sorting carbon nanotubes via dielectrophoresis

R. Krupke, F. Hennrich

Institut fuer Nanotechnologie, Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany
Contact e-mail: krupke@int.fzk.de

Whenever the electronic properties of carbon nanotubes matter, it is beneficial to use single-walled carbon nanotubes, which have been sorted by their metallicity. Dielectrophoresis at high electrical-field frequency allows to sort out the metallic tubes from a mixed suspension [1]. The theoretical modelling of the process predicts the yield of separation to be intrinsically at 100% [2,3]. Experimentally this yield is affected by the residual bundle content of the nanotube suspension, the electrical-field frequency and the surfactant content.
We will present the optimum conditions for separation. Due to our recent progress in upscaling the method, we are now able to base our analysis on optical absorption spectroscopy in addition to resonant Raman spectroscopy.
 

References:

1] R. Krupke, F, Hennrich, H. v. Löhneysen, M. M. Kappes, Science 301 (2003) 344
[2] R. Krupke, F. Hennrich, M. M. Kappes, H. v. Löhneysen, Nano Lett. 4 (2004) 1395
[3] R. Krupke, F. Hennrich, Adv. Eng. Mater. 2005
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