Reports

Structure-Based Carbon Nanotube Sorting by Sequence-Dependent DNA Assembly

Ming Zheng,^1* Anand Jagota,¹ Michael S. Strano,² Adelina P. Santos,³ Paul Barone,² S. Grace Chou,³ Bruce A. Diner,¹ Mildred S. Dresselhaus,³ Robert S. Mclean,¹ G. Bibiana Onoa,¹ Georgii G. Samsonidze,³ Ellen D. Semke,¹ Monica Usrey,² Dennis J. Walls¹

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.

¹ DuPont Central Research and Development, Experimental Station, Wilmington, DE 19880, USA.
² Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
³ Department of Physics, Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Permanent address: Cento de Desenvolvimento da Tecnologia Nuclear, CDTN/CNEN, Belo Horizonte-MG, 30123-970, Brazil.

^* To whom correspondence should be addressed. E-mail: ming.zheng{at}usa.dupont.com

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Preferential Growth of Single-Walled Carbon Nanotubes with Metallic Conductivity.

A. R. Harutyunyan, G. Chen, T. M. Paronyan, E. M. Pigos, O. A. Kuznetsov, K. Hewaparakrama, S. M. Kim, D. Zakharov, E. A. Stach, and G. U. Sumanasekera (2009)
Science 326, 116-120
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Fabricating Genetically Engineered High-Power Lithium-Ion Batteries Using Multiple Virus Genes.

Y. J. Lee, H. Yi, W.-J. Kim, K. Kang, D. S. Yun, M. S. Strano, G. Ceder, and A. M. Belcher (2009)
Science 324, 1051-1055
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Carboxyl-modified single-walled carbon nanotubes selectively induce human telomeric i-motif formation.

X. Li, Y. Peng, J. Ren, and X. Qu (2006)
PNAS 103, 19658-19663
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Selective etching of metallic carbon nanotubes by gas-phase reaction..

G. Zhang, P. Qi, X. Wang, Y. Lu, X. Li, R. Tu, S. Bangsaruntip, D. Mann, L. Zhang, and H. Dai (2006)
Science 314, 974-977
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Carbon nanotubes selective destabilization of duplex and triplex DNA and inducing B-A transition in solution.

X. Li, Y. Peng, and X. Qu (2006)
Nucleic Acids Res. 34, 3670-3676
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Research Strategies for Safety Evaluation of Nanomaterials, Part VIII: International Efforts to Develop Risk-Based Safety Evaluations for Nanomaterials.

K. Thomas, P. Aguar, H. Kawasaki, J. Morris, J. Nakanishi, and N. Savage (2006)
Toxicol. Sci. 92, 23-32
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Optical Detection of DNA Conformational Polymorphism on Single-Walled Carbon Nanotubes.

D. A. Heller, E. S. Jeng, T.-K. Yeung, B. M. Martinez, A. E. Moll, J. B. Gastala, and M. S. Strano (2006)
Science 311, 508-511
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Label-free detection of DNA hybridization using carbon nanotube network field-effect transistors.

A. Star, E. Tu, J. Niemann, J.-C. P. Gabriel, C. S. Joiner, and C. Valcke (2006)
PNAS 103, 921-926
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