DuPont-led scientists unveil key nanotechnology discovery with use of DNA

Sorting carbon nanotubes provides significant step in advancing nano-electronics applications

A collaborative group of DuPont-led scientists have discovered an innovative way to advance electronics applications through the use of DNA that sorts carbon nanotubes.

This research in the emerging field of nanotechnology appears in the current issue of the journal Science, which is published by the AAAS – the world’s largest general scientific organization. The research paper is titled “Structure-Based Carbon Nanotube Sorting by Sequence-Dependent DNA Assembly.”

Carbon nanotubes possess excellent electrical properties that make them potential building blocks in a broad range of nanotechnology-related electronic applications, including highly sensitive medical diagnostic devices and mini-transistors more than 100 times tinier than those found in today’s microchips. When they are fabricated, however, carbon nanotubes of different electronic types randomly clump together, deterring consistent conductivity. The ability to sort and assemble carbon nanotubes allows for uniform conductivity – enabling the applications to be realized.

Initially, DuPont Central Research & Development scientists found that single-stranded DNA strongly interacts with carbon nanotubes to form a stable DNA-carbon nanotube hybrid that effectively disperses carbon nanotubes in an aqueous solution.

As a follow-up to that initial work, a multidisciplinary team of scientists from DuPont, the Massachusetts Institute for Technology (MIT) and the University of Illinois worked together to discover a new method for separating carbon nanotubes using single stranded DNA and anion-exchange chromatography. By screening a library of oligonucleotides, the team found that a particular sequence of single stranded DNA self-assembles into a helical structure around individual carbon nanotubes. Since carbon nanotube-DNA hybrids have different electrostatic properties that depend on the nanotubes’ diameter and electronic properties, they can be separated and sorted using anion exchange chromatography. The technique can be used to separate metallic carbon nanotubes from semiconducting carbon nanotubes, both which are created during nanotube production. The technique also can sort semiconducting carbon nanotubes by diameters, an important element in nanoelectronic applications. The collaborative work is further detailed in the current edition of Science.

“Wrapping of carbon nanotubes by single-stranded DNA was found to be sequence-dependent,” said DuPont Central Research & Development scientist Ming Zheng. “This outstanding collaborative effort is a good example how researchers from both industry and academic institutions can work together in a multidisciplinary approach to further advance this emerging technology.”

DuPont Central Research & Development scientists who contributed to the research were Ming Zheng, Anand Jagota, Bruce A. Diner, Robert S. McLean, G. Bibiana Onoa, Ellen D. Semke and Dennis J. Walls. University of Illinois contributors were Michael S. Strano, Paul Barone, and Monica Usrey. MIT contributors were Adelina P. Santos, Grace Chou, Mildred S. Dresselhaus, and Georgii G. Samsonidze.

DuPont is a science company. Founded in 1802, DuPont puts science to work by solving problems and creating solutions that make people’s lives better, safer and easier. Operating in more than 70 countries, the company offers a wide range of products and services to markets including agriculture, nutrition, electronics, communications, safety and protection, home and construction, transportation and apparel.

Media Contact

Anthony Farina EurekAlert!

Weitere Informationen:

http://www.dupont.com/

Alle Nachrichten aus der Kategorie: Interdisciplinary Research

News and developments from the field of interdisciplinary research.

Among other topics, you can find stimulating reports and articles related to microsystems, emotions research, futures research and stratospheric research.

Zurück zur Startseite

Kommentare (0)

Schreib Kommentar

Neueste Beiträge

Copycat plant booster improves on nature

A molecule that can mimic the function of zaxinone, a natural growth-promoting plant metabolite, has been designed and fabricated by an international team led by KAUST and the University of…

Discovery of large family of two-dimensional ferroelectric metals

It is usually believed that ferroelectricity can appear in insulating or semiconducting materials rather than in metals, because conducting electrons of metals always screen out the internal static electric field…

Recording thousands of nerve cell impulses at high resolution

For over 15 years, ETH Professor Andreas Hierlemann and his group have been developing microelectrode-array chips that can be used to precisely excite nerve cells in cell cultures and to…

By continuing to use the site, you agree to the use of cookies. more information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.

Close