Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > DuPont, Lehigh Scientists Refine DNA Sorting of Carbon Nanotubes Technique, Creates First Approach to Sorting Nanotubes by Species

Graphic: Refined process for DNA sorting of carbon nanotubes by species – model of a DNA barrel on a (8,4) nanotube formed by rolling up a 2D DNA sheet composed of two hydrogen-bonded anti-parallel ATTTATTTATTT strands..  (Graphic is courtesy of Lehigh University.).
Graphic: Refined process for DNA sorting of carbon nanotubes by species – model of a DNA barrel on a (8,4) nanotube formed by rolling up a 2D DNA sheet composed of two hydrogen-bonded anti-parallel ATTTATTTATTT strands.. (Graphic is courtesy of Lehigh University.).

Abstract:
Discovery Provides Significant Step in Advancing Nano-Electronics, Nano-Photovoltaics

DuPont, Lehigh Scientists Refine DNA Sorting of Carbon Nanotubes Technique, Creates First Approach to Sorting Nanotubes by Species

Wilmington, DE | Posted on July 16th, 2009

Scientists at DuPont and Lehigh University have refined a technique, first published in 2003, to sort carbon nanotubes using specific sequences of DNA. This technique offers the first demonstration that nanotubes can be sorted by size, property and symmetry (chirality).

This new finding, reported in the current issue (Vol. 460 No. 7252) of the journal Nature, is titled "DNA Sequence Motifs for Structure-Specific Recognition and Separation of Carbon Nanotubes." The study was co-authored by DuPont researchers Ming Zheng and Xiamin Tu, with Lehigh University professor of chemical engineering Anand Jagota and student Suresh Manohar. The research was funded by a National Science Foundation grant to a collaborative team from Lehigh University, MIT and DuPont.

There has been great interest in the revolutionary electrical, mechanical and thermal properties of single walled carbon nanotubes (SWNTs) since their discovery in the early 1990s. However, single walled carbon nanotubes are produced as complex mixtures of different nanotube species with different properties, greatly limiting their applications. In 2003, a publication in Science by DuPont scientists, including Zheng, disclosed a method to separate carbon nanotubes using DNA. This was the first demonstration that the problem of sorting SWNTs could be solved. DuPont has continued to investigate these materials, most recently publishing a chemical approach to separating metallic and semi-conducting nanotubes in the Jan. 9 edition of Science. The current development is a significant advancement in this pioneering field, perfecting the only approach that uses biological molecules to carry out a refined sorting of carbon nanotubes, separating nanotubes with different optical, electronic and chemical properties.

"Our technique is similar to sorting snowflakes by wrapping DNA around each flake," Zheng said. "Nanotubes come in many sizes and designs, and each type offers unique properties for uses that can range from transistors for electronics, light sources for displays or conducting films for photovoltaic materials. The difficult part of our approach is identifying which DNA sequence is most efficient at separation. Our approach was a bit like probing into the DNA library to determine sequences. Through this approach we tried over 350 sequences and identified more than 20 that showed useful separation properties."

During the 18-month research program, Zheng and Tu set the course for the experimental work to identify the DNA sequences, and Jagota and Manohar developed the molecular models. The approach builds on the 2003 findings that a DNA sequence will wrap around a SWNT and then interact with micro-size beads in an anion exchange chromatography set-up in a way that depends on the type of nanotube to which the DNA is attached. This occurs because the carbon nanotube-DNA hybrids have different electrostatic properties that depend on the nanotubes' diameter and electronic behavior. The latest study has determined that the interaction is dependent on both the type of nanotube and the type of DNA. As a result, the research team focused on identifying the DNA sequences that performed the best with their corresponding SWNT species. The DNA library is vast, making the chance of finding these sequences through trial-and-error exceedingly low. The research team identified an approach called "sequence expansion" to systematically explore the DNA library in a confined and progressive manner. The result was the identification of more than 20 DNA sequences that reacted favorably with 12 species of nanotubes, sorting them with purity level of 80 to 90 percent.

"We are at a historic moment when biology and materials science meet at the nano meter scale, and this opens up lots of opportunities for new science and technology development," Zheng said. "We think this is the ultimate solution to isolate and identify every species of nanotube, allowing us to take advantage of the highest performance nanotube to create high performance nano-electronic and nano-photovoltaic materials and devices."

DuPont Science & Technology provides technologies and transformational options for new and existing businesses, building on a long, rich legacy of leading-edge science and innovation. Products commercialized over the last five years accounted for 35 percent of the company's total revenue.

DuPont is a science-based products and services company. Founded in 1802, DuPont puts science to work by creating sustainable solutions essential to a better, safer, healthier life for people everywhere. Operating in more than 70 countries, DuPont offers a wide range of innovative products and services for markets including agriculture and food; building and construction; communications; and transportation.

####

About DuPont
Founded in 1802, DuPont puts science to work by creating sustainable solutions essential to a better, safer, healthier life for people everywhere. Operating in more than 70 countries, DuPont offers a wide range of innovative products and services for markets including agriculture, nutrition, electronics, communications, safety and protection, home and construction, transportation and apparel.

For more information, please click here

Contacts:
Michelle Reardon
302-774-4005

Copyright © DuPont

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

“DNA Sequence Motifs for Structure-Specific Recognition and Separation of Carbon Nanotubes”

Related News Press

News and information

In borophene, boundaries are no barrier: Rice U., Northwestern researchers make and test atom-thick boron's unique domains July 17th, 2018

Tuning into quantum: Scientists unlock signal frequency control of precision atom qubits July 16th, 2018

Nano-kirigami: 'Paper-cut' provides model for 3D intelligent nanofabrication July 13th, 2018

UMBC researchers develop nanoparticles to reduce internal bleeding caused by blast trauma July 13th, 2018

Nanotubes/Buckyballs/Fullerenes/Nanorods

Carbon is the new black: Researchers use carbon nanotubes to develop clothing that can double as batteries July 10th, 2018

Nano-saturn: Supramolecular complex formation: Anthracene macrocycle and C60 fullerene June 8th, 2018

Unzipping graphene nanotubes into nanoribbons: New study shows elegant mathematical solution to understand how the flow of electrons changes when carbon nanotubes turn into zigzag nanoribbons June 6th, 2018

Making carbon nanotubes as usable as common plastics: Researchers discover that cresols disperse carbon nanotubes at unprecedentedly high concentrations May 15th, 2018

Nanoelectronics

GLOBALFOUNDRIES Surpasses $2 Billion in Design Win Revenue on 22FDX® Technology : With 50 client designs and growing, 22FDX proves its value as a cost-effective solution for power-sensitive applications July 9th, 2018

High-power electronics keep their cool with new heat-conducting crystals July 6th, 2018

Leti Presenting Strategic Vision and Hosting a Workshop at SEMICON West: “From Electrons to Photons” Leti Workshop and CEO Media Briefing Set for Tuesday, July 10 in W Hotel, San Francisco June 12th, 2018

Quantum Interference May Be Key to Smaller Insulators: Breakthrough could jumpstart further miniaturization of transistors June 6th, 2018

Announcements

In borophene, boundaries are no barrier: Rice U., Northwestern researchers make and test atom-thick boron's unique domains July 17th, 2018

Tuning into quantum: Scientists unlock signal frequency control of precision atom qubits July 16th, 2018

Nano-kirigami: 'Paper-cut' provides model for 3D intelligent nanofabrication July 13th, 2018

UMBC researchers develop nanoparticles to reduce internal bleeding caused by blast trauma July 13th, 2018

Alliances/Trade associations/Partnerships/Distributorships

Leti and Oscaro Partner on Leti’s New Low-Power, Low-Cost Transceiver to Track Parcels July 12th, 2018

Leti and Soitec Launch a New Substrate Innovation Center to Develop Engineered Substrate Solutions: Industry-inclusive hub promotes early collaboration and learning from substrate to system level July 11th, 2018

Leti & Partners Launch Pilot Program to Assess New Perception Sensors for Autonomous Vehicles July 5th, 2018

Powering the 21st Century with Integrated Photonics: UCSB-Led Team Selected for Demonstration of a Novel Waveguide Platform Which is Transparent Throughout the MWIR and LWIR Spectral Bands June 19th, 2018

Research partnerships

In borophene, boundaries are no barrier: Rice U., Northwestern researchers make and test atom-thick boron's unique domains July 17th, 2018

Nano-kirigami: 'Paper-cut' provides model for 3D intelligent nanofabrication July 13th, 2018

Leti and Soitec Launch a New Substrate Innovation Center to Develop Engineered Substrate Solutions: Industry-inclusive hub promotes early collaboration and learning from substrate to system level July 11th, 2018

Leti & Partners Launch Pilot Program to Assess New Perception Sensors for Autonomous Vehicles July 5th, 2018

Solar/Photovoltaic

Northwestern researchers achieve unprecedented control of polymer grids: Materials could find applications in water purification, solar energy storage, body armor June 22nd, 2018

Team achieves two-electron chemical reactions using light energy, gold May 15th, 2018

Hematene joins parade of new 2D materials: Rice University-led team extracts 3-atom-thick sheets from common iron oxide May 8th, 2018

Harvesting clean hydrogen fuel through artificial photosynthesis May 3rd, 2018

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project