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

Fast, efficient sperm tails inspire nanobiotechnology December 5th, 2016

Journal Nanotechnology Progress International (JONPI) Volume 6, issue 2 coming out soon! December 5th, 2016

Infrared instrumentation leader secures exclusive use of Vantablack coating December 5th, 2016

Construction of practical quantum computers radically simplified: Scientists invent ground-breaking new method that puts quantum computers within reach December 5th, 2016

Nanotubes/Buckyballs/Fullerenes

Infrared instrumentation leader secures exclusive use of Vantablack coating December 5th, 2016

Novel Electrode Structure Provides New Promise for Lithium-Sulfur Batteries December 3rd, 2016

Cutting-edge nanotechnologies are breaking into industries November 18th, 2016

Hybrid nanostructures hold hydrogen well: Rice University scientists say boron nitride-graphene hybrid may be right for next-gen green cars October 25th, 2016

Nanoelectronics

Journal Nanotechnology Progress International (JONPI) Volume 6, issue 2 coming out soon! December 5th, 2016

Supersonic spray yields new nanomaterial for bendable, wearable electronics: Film of self-fused nanowires clear as glass, conducts like metal November 23rd, 2016

What a twist: Silicon nanoantennas turn light around: The theoretical results will allow scientists to design nanodevices with extraordinary features for use in optoelectronics November 21st, 2016

2-D material a brittle surprise: Rice University researchers finds molybdenum diselenide not as strong as they thought November 14th, 2016

Announcements

Fast, efficient sperm tails inspire nanobiotechnology December 5th, 2016

Journal Nanotechnology Progress International (JONPI) Volume 6, issue 2 coming out soon! December 5th, 2016

Infrared instrumentation leader secures exclusive use of Vantablack coating December 5th, 2016

Construction of practical quantum computers radically simplified: Scientists invent ground-breaking new method that puts quantum computers within reach December 5th, 2016

Alliances/Trade associations/Partnerships/Distributorships

Infrared instrumentation leader secures exclusive use of Vantablack coating December 5th, 2016

Leti and Grenoble Partners Demonstrate World’s 1st Qubit Device Fabricated in CMOS Process: Paper by Leti, Inac and University of Grenoble Alpes Published in Nature Communications November 28th, 2016

Mechanism for sodium storage in 2-D material: Tin selenide is an effective host for storing sodium ions, making it a promising material for sodium ion batteries October 27th, 2016

Enterprise In Space Partners with Sketchfab and 3D Hubs for NewSpace Education October 13th, 2016

Research partnerships

Deep insights from surface reactions: Researchers use Stampede supercomputer to study new chemical sensing methods, desalination and bacterial energy production December 2nd, 2016

Quantum obstacle course changes material from superconductor to insulator December 1st, 2016

Novel silicon etching technique crafts 3-D gradient refractive index micro-optics November 28th, 2016

Single photon converter -- a key component of quantum internet November 28th, 2016

Solar/Photovoltaic

Research Study: MetaSOLTM Shatters Solar Panel Efficiency Forecasts with Innovative New Coating: Coating Provides 1.2 Percent Absolute Enhancement to Triple Junction Solar Cells December 2nd, 2016

Throwing new light on printed organic solar cells December 1st, 2016

Physics, photosynthesis and solar cells: Researchers combine quantum physics and photosynthesis to make discovery that could lead to highly efficient, green solar cells November 30th, 2016

'Back to the Future' inspires solar nanotech-powered clothing November 15th, 2016

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




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project