Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button


DHgate

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

Cooling graphene-based film close to pilot-scale production April 30th, 2016

Personal cooling units on the horizon April 29th, 2016

Exploring phosphorene, a promising new material April 29th, 2016

The Translational Research Center at the University Hospital of Erlangen in Germany uses the ZetaView from Particle Metrix to quantify extracellular vesicles such as exosomes April 28th, 2016

Nanotubes/Buckyballs/Fullerenes

NREL finds nanotube semiconductors well-suited for PV systems April 27th, 2016

Researchers create artificial protein to control assembly of buckyballs April 27th, 2016

Cleaning up hybrid battery electrodes improves capacity and lifespan: New way of building supercapacitor-battery electrodes eliminates interference from inactive components April 22nd, 2016

Nature Photonics: Light source for quicker computer chips: Waveguide with integrated carbon nanotubes for conversion of electric signals into light / quicker computer chips are feasible / publication in Nature Photonics April 21st, 2016

Nanoelectronics

Cooling graphene-based film close to pilot-scale production April 30th, 2016

Exploring phosphorene, a promising new material April 29th, 2016

With simple process, UW-Madison engineers fabricate fastest flexible silicon transistor April 21st, 2016

All powered up: UCI chemists create battery technology with off-the-charts charging capacity April 21st, 2016

Announcements

Cooling graphene-based film close to pilot-scale production April 30th, 2016

Personal cooling units on the horizon April 29th, 2016

Exploring phosphorene, a promising new material April 29th, 2016

The Translational Research Center at the University Hospital of Erlangen in Germany uses the ZetaView from Particle Metrix to quantify extracellular vesicles such as exosomes April 28th, 2016

Alliances/Trade associations/Partnerships/Distributorships

Electrically Conductive Graphene Ink Enables Printing of Biosensors April 23rd, 2016

Leti Extends Collaboration with Qualcomm on CoolCubeTM 3D Integration Technology for High-Density, High-Performance ICs: Collaboration Goals Include Building an Ecosystem To Take the Chip-stacking Technology from Design to Fabrication April 13th, 2016

FEI Partners with Five Pharmaceutical Companies, the Medical Research Council and the University of Cambridge to form Cryo-EM Research Consortium April 5th, 2016

Strem Chemicals and SONA Nanotech Sign Distribution Agreement for the World’s First Gold Nanorods Synthesized without CTAB February 24th, 2016

Research partnerships

Cooling graphene-based film close to pilot-scale production April 30th, 2016

Personal cooling units on the horizon April 29th, 2016

Exploring phosphorene, a promising new material April 29th, 2016

Nanoparticles hold promise as double-edged sword against genital herpes April 28th, 2016

Solar/Photovoltaic

NREL finds nanotube semiconductors well-suited for PV systems April 27th, 2016

Flipping a chemical switch helps perovskite solar cells beat the heat April 26th, 2016

Manipulating light inside opaque layers April 24th, 2016

Thin-film solar cells: How defects appear and disappear in CIGSe cells: Concentration of copper plays a crucial role April 23rd, 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







Car Brands
Buy website traffic