Abstract Submitted to the    NANOTUBE'04 Conference:

Single-stranded DNA (ssDNA) forms stable complex with CNT and effectively disperses CNT into aqueous solution. We found that a particular ssDNA sequence ( d(GT)n, n = 10 to 45 ) self-assembles into an ordered supramolecular structure around individual CNT, in such a way that the electrostatic properties of the DNA-CNT hybrid depend on tube type, enabling CNT separation by anion-exchange chromatography. Optical absorption and Raman spectroscopy showed that the separation is bimodal based on both electronic properties and the diameters of CNTs: early fractions are enriched in the smaller diameters and metallic tubes, whereas late fractions are enriched in the larger diameters and semiconducting tubes. In this talk, I will show the separation of single (n, m) type carbon nanotubes and use of the material in novel solution chemistry and device applications. This work comes from the Molecular Electronics group at DuPont CR&D.