title: Structure-based carbon nanotube sorting by sequence-dependent DNA assembly.
abstract: Wrapping of carbon nanotubes (CNTs) by single-stranded DNA (ssDNA) was found to be sequence-dependent. A systematic search of the ssDNA library selected a sequence d(GT)n, n = 10 to 45 that self-assembles into a helical structure around individual nanotubes in such a way that the electrostatics of the DNA-CNT hybrid depends on tube diameter and electronic properties, enabling nanotube separation by anion exchange chromatography. Optical absorption and Raman spectroscopy show that early fractions are enriched in the smaller diameter and metallic tubes, whereas late fractions are enriched in the larger diameter and semiconducting tubes.
authors.affiliation: DuPont Central Research and Development, Experimental Station, Wilmington, DE 19880, USA. ming.zheng@usa.dupont.com
authors.forename: Ming
authors.initials: M
authors.lastname: Zheng
authors.forename: Anand
authors.initials: A
authors.lastname: Jagota
authors.forename: Michael S
authors.initials: MS
authors.lastname: Strano
authors.forename: Adelina P
authors.initials: AP
authors.lastname: Santos
authors.forename: Paul
authors.initials: P
authors.lastname: Barone
authors.forename: S Grace
authors.initials: SG
authors.lastname: Chou
authors.forename: Bruce A
authors.initials: BA
authors.lastname: Diner
authors.forename: Mildred S
authors.initials: MS
authors.lastname: Dresselhaus
authors.forename: Robert S
authors.initials: RS
authors.lastname: McLean
authors.forename: G Bibiana
authors.initials: GB
authors.lastname: Onoa
authors.forename: Georgii G
authors.initials: GG
authors.lastname: Samsonidze
authors.forename: Ellen D
authors.initials: ED
authors.lastname: Semke
authors.forename: Monica
authors.initials: M
authors.lastname: Usrey
authors.forename: Dennis J
authors.initials: DJ
authors.lastname: Walls
mesh_terms: D000838:Anions; D001483:Base Sequence; D002852:Chromatography, Ion Exchange; D004277:DNA, Single-Stranded / Q000737:chemistry*; D003854:Deoxyribonucleotides / Q000737:chemistry; D015723:Gene Library; D006860:Hydrogen Bonding; D018625:Microscopy, Atomic Force; D036103:Nanotechnology; D037742:Nanotubes, Carbon; D009690:Nucleic Acid Conformation; D012091:Repetitive Sequences, Nucleic Acid; D012666:Semiconductors; D013057:Spectrum Analysis; D013059:Spectrum Analysis, Raman; D055672:Static Electricity
chemical_list: D000838:Anions; D004277:DNA, Single-Stranded; D003854:Deoxyribonucleotides; D037742:Nanotubes, Carbon