Structure-based carbon nanotube sorting by sequence-dependent DNA assembly.
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.
Zheng
Ming
M
DuPont Central Research and Development, Experimental Station, Wilmington, DE 19880, USA. ming.zheng@usa.dupont.com
Jagota
Anand
A
Strano
Michael S
MS
Santos
Adelina P
AP
Barone
Paul
P
Chou
S Grace
SG
Diner
Bruce A
BA
Dresselhaus
Mildred S
MS
McLean
Robert S
RS
Onoa
G Bibiana
GB
Samsonidze
Georgii G
GG
Semke
Ellen D
ED
Usrey
Monica
M
Walls
Dennis J
DJ
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
D000838:Anions; D004277:DNA, Single-Stranded; D003854:Deoxyribonucleotides; D037742:Nanotubes, Carbon