Concomitant length and diameter separation of single-walled carbon nanotubes

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Year: 2004
Type of Publication: Article
  • D. A. Heller, S. Baik R. M. Mayrhofer
Journal: Journal of the American Chemical Society Volume: 126
Number: 44 Pages: 14567-14573
Month: NOV 10 2004
PT: J; TC: 146; UT: WOS:000224964500058
Gel electrophoresis and column chromatography conducted on individually dispersed, ultrasonicated single-walled carbon nanotubes yield simultaneous separation by tube length and diameter. Electroelution after electrophoresis is shown to produce highly resolved fractions of nanotubes with average lengths between 92 and 435 nm. Separation by diameter is concomitant with length fractionation, and nanotubes that have been cut shortest also possess the greatest relative enrichments of large-diameter species. Longer sonication time causes increased electrophoretic. mobility in the gels; thus, ultrasonic processing determines the degree of both length and diameter separation of the nanotubes. The relative quantum yield decreases nonlinearly as the nanotube length becomes shorter. These techniques constitute a preparative, scalable method for separating nanotubes by two important attributes required for electronic and sensor applications.