Log Number: P236
Abstract Submitted to the    NANOTUBE'04 Conference:

Extraction of semiconducting CNTs by repeated dielectrophoretic filterings

D. S. Lee1, D. W. Kim1, H. S. Kim1, S. W. Lee1, S. H. Jhang1, E. E. B. Campbell2, Y. W. Park1

1 School of Physics and Condensed Matter Research Institute, Seoul National University, Seoul 151-747, Korea
2 Department of Experimental Physics, Göteborg University and Chalmers University of Technology, SE-41296 Göteborg, Sweden

Contact e-mail: dwater@phya.snu.ac.kr

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 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 %.

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