Extraction of semiconducting CNTs by repeated dielectrophoretic filtering

D. S. Lee; D. W. Kim; H. S. Kim; S. W. Lee; S. H. Jhang; Y. W. Park; E. E.B. Campbell

doi:10.1007/s00339-004-2992-4

Extraction of semiconducting CNTs by repeated dielectrophoretic filtering

D. S. Lee, D. W. Kim, H. S. Kim, S. W. Lee, S. H. Jhang, Y. W. Park, E. E.B. Campbell

Department of Physics

Research output: Contribution to journal › Article › peer-review

40 Scopus citations

Abstract

We have separated semiconducting carbon nanotubes from as-grown batch material (HiPco production). A special configuration of electrodes which generates a 3-dimensional electric field gradient was used to filter out and deposit metallic carbon nanotubes by the dielectrophoretic method, leaving the remaining dispersion enriched in semiconducting nanotubes. The efficiency of filtering was determined by Raman spectroscopy. Using repeated deposition cycles, the ratio of semiconducting to metallic tubes was increased. After seven cycles, the proportion of semiconducting tubes in the remaining dispersion reached 94%.

Original language	English
Pages (from-to)	5-8
Number of pages	4
Journal	Applied Physics A: Materials Science and Processing
Volume	80
Issue number	1
DOIs	https://doi.org/10.1007/s00339-004-2992-4
State	Published - Jan 2005

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Extraction of semiconducting CNTs by repeated dielectrophoretic filtering

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