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Originally published in Science Express on 26 June 2003
Science 18 July 2003:
Vol. 301. no. 5631, pp. 344 - 347
DOI: 10.1126/science.1086534
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Reports

Separation of Metallic from Semiconducting Single-Walled Carbon Nanotubes

Ralph Krupke,1*{dagger} Frank Hennrich,1*{dagger} Hilbert v. Löhneysen,2,4 Manfred M. Kappes1,3

We have developed a method to separate metallic from semiconducting single-walled carbon nanotubes from suspension using alternating current dielectrophoresis. Our method takes advantage of the difference of the relative dielectric constants of the two species with respect to the solvent, resulting in an opposite movement of metallic and semiconducting tubes along the electric field gradient. Metallic tubes are attracted toward a microelectrode array, leaving semiconducting tubes in the solvent. Proof of the effectiveness of separation is given by a comparative Raman spectroscopy study on the dielectrophoretically deposited tubes and on a reference sample.

1 Forschungszentrum Karlsruhe, Institut für Nanotechnologie, D-76021 Karlsruhe, Germany. 2 Physikalisches Institut, 3 Institut für Physikalische Chemie, Universität Karlsruhe, D-76128 Karlsruhe, Germany. 4 Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe, Germany.



* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: ralph.krupke{at}int.fzk.de (R.K.); frank.hennrich{at}int.fzk.de (F.H.)

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