Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > A smashing new look at nanoribbons: Rice University lab unzips nanotubes into ribbons by shooting them at a target

Molecular simulations and electron microscope images show what happens to a carbon nanotube when the end of it strikes a target directly at about 15,000 miles per hour. Rice University researchers found the nanotubes split into useful nanoribbons.Credit: Ajayan Group/Rice University
Molecular simulations and electron microscope images show what happens to a carbon nanotube when the end of it strikes a target directly at about 15,000 miles per hour. Rice University researchers found the nanotubes split into useful nanoribbons.

Credit: Ajayan Group/Rice University

Abstract:
Carbon nanotubes "unzipped" into graphene nanoribbons by a chemical process invented at Rice University are finding use in all kinds of projects, but Rice scientists have now found a chemical-free way to unzip them.

A smashing new look at nanoribbons: Rice University lab unzips nanotubes into ribbons by shooting them at a target

Houston, TX | Posted on June 30th, 2014

The Rice lab of materials scientist Pulickel Ajayan discovered that nanotubes that hit a target end first turn into mostly ragged clumps of atoms. But nanotubes that happen to broadside the target unzip into handy ribbons that can be used in composite materials for strength and applications that take advantage of their desirable electrical properties.

The Rice researchers led by graduate student Sehmus Ozden reported their finding in the American Chemical Society journal Nano Letters.

The result was a surprise, Ozden said. "Until now, we knew we could use mechanical forces to shorten and cut carbon nanotubes. This is the first time we have showed carbon nanotubes can be unzipped using mechanical forces."

The researchers fired pellets of randomly oriented, multiwalled carbon nanotubes from a light gas gun built by the Rice lab of materials scientist Enrique Barrera with funding from NASA. The pellets impacted an aluminum target in a vacuum chamber at about 15,000 miles per hour. When they inspected the resulting carbon rubble, they found nanotubes that smashed into the target end first or at a sharp angle simply deformed into a crumpled nanotube. But tubes that hit lengthwise actually split into ribbons with ragged edges.

"Hypervelocity impact tests are mostly used to simulate the impact of different projectiles on shields, spacecraft and satellites," Ozden said. "We were investigating possible applications for carbon nanotubes in space when we got this result."

The effect was confirmed through molecular simulations. They showed that when multiwalled tubes impact the target, the outer tube flattens, hitting the inside tubes and unzipping them in turn. Single-wall nanotubes do just the opposite; when the tube flattens, the bottom wall hits the inside of the top wall, which unzips from the middle out to the edges.

Ozden explained that the even distribution of stress along the belly-flopping nanotube, which is many times longer than it is wide, breaks carbon bonds in a line nearly simultaneously.

The researchers said 70 to 80 percent of the nanotubes in a pellet unzip to one degree or another.

Ozden said the process eliminates the need to clean chemical residues from nanoribbons produced through current techniques. "One-step, chemical-free, clean and high-quality graphene nanoribbons can be produced using our method. They're potential candidates for next-generation electronic materials," he said.

Co-authors include Pedro Autreto, a postdoctoral researcher at the State University of Campinas, Brazil, who has a complimentary appointment at Rice; graduate student Chandra Sekhar Tiwary of Rice and the Indian Institute of Science, Bangalore; graduate student Suman Khatiwada of Rice; Leonardo Machado and Douglas Galvao of the State University of Campinas; and Robert Vajtai, a senior faculty fellow at Rice. Barrera is a professor of materials science and nanoengineering. Ajayan is Rice's Benjamin M. and Mary Greenwood Anderson Professor in Mechanical Engineering and Materials Science and of chemistry, and chair of the Department of Materials Science and NanoEngineering.

The Department of Defense, U.S. Air Force Office of Scientific Research through a Multidisciplinary University Research Institute grant, and the Brazilian agencies National Council for Scientific and Technological Development, Coordination for the Improvement of Higher Education Personnel and the São Paulo Research Foundation supported the research.

####

About Rice University
Located on a 300-acre forested campus in Houston, Rice University is consistently ranked among the nation's top 20 universities by U.S. News & World Report. Rice has highly respected schools of Architecture, Business, Continuing Studies, Engineering, Humanities, Music, Natural Sciences and Social Sciences and is home to the Baker Institute for Public Policy. With 3,920 undergraduates and 2,567 graduate students, Rice's undergraduate student-to-faculty ratio is 6.3-to-1. Its residential college system builds close-knit communities and lifelong friendships, just one reason why Rice has been ranked No. 1 for best quality of life multiple times by the Princeton Review and No. 2 for "best value" among private universities by Kiplinger's Personal Finance.

Follow Rice News and Media Relations via Twitter @RiceUNews

For more information, please click here

Contacts:
David Ruth
713-348-6327


Mike Williams
713-348-6728

Copyright © Rice University

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

Read the abstract at:

Ajayan Research Group:

Enrique Barrera:

Department of Materials Science and NanoEngineering:

Related News Press

News and information

Forces of nature: Interview with microscopy innovators Gerd Binnig and Christoph Gerber August 26th, 2016

A promising route to the scalable production of highly crystalline graphene films August 26th, 2016

Graphene under pressure August 26th, 2016

Stretchy supercapacitors power wearable electronics August 25th, 2016

Graphene/ Graphite

A promising route to the scalable production of highly crystalline graphene films August 26th, 2016

Graphene under pressure August 26th, 2016

Govt.-Legislation/Regulation/Funding/Policy

Analog DNA circuit does math in a test tube: DNA computers could one day be programmed to diagnose and treat disease August 25th, 2016

New approach to determining how atoms are arranged in materials August 25th, 2016

Johns Hopkins scientists track metabolic pathways to find drug combination for pancreatic cancer August 25th, 2016

New electrical energy storage material shows its power: Nanomaterial combines attributes of both batteries and supercapacitors August 25th, 2016

Nanotubes/Buckyballs/Fullerenes

Tunneling nanotubes between neurons enable the spread of Parkinson's disease via lysosomes August 24th, 2016

McMaster researchers resolve a problem that has been holding back a technological revolution August 18th, 2016

'Second skin' protects soldiers from biological and chemical agents August 5th, 2016

Carbon nanotube 'stitches' make stronger, lighter composites: Method to reinforce these materials could help make airplane frames lighter, more damage-resistant August 4th, 2016

Discoveries

A promising route to the scalable production of highly crystalline graphene films August 26th, 2016

Graphene under pressure August 26th, 2016

Johns Hopkins scientists track metabolic pathways to find drug combination for pancreatic cancer August 25th, 2016

New electrical energy storage material shows its power: Nanomaterial combines attributes of both batteries and supercapacitors August 25th, 2016

Announcements

Forces of nature: Interview with microscopy innovators Gerd Binnig and Christoph Gerber August 26th, 2016

A promising route to the scalable production of highly crystalline graphene films August 26th, 2016

Graphene under pressure August 26th, 2016

New electrical energy storage material shows its power: Nanomaterial combines attributes of both batteries and supercapacitors August 25th, 2016

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

Forces of nature: Interview with microscopy innovators Gerd Binnig and Christoph Gerber August 26th, 2016

A promising route to the scalable production of highly crystalline graphene films August 26th, 2016

Analog DNA circuit does math in a test tube: DNA computers could one day be programmed to diagnose and treat disease August 25th, 2016

New electrical energy storage material shows its power: Nanomaterial combines attributes of both batteries and supercapacitors August 25th, 2016

Military

New electrical energy storage material shows its power: Nanomaterial combines attributes of both batteries and supercapacitors August 25th, 2016

Nanoparticles that speed blood clotting may someday save lives August 23rd, 2016

Curbing the life-long effects of traumatic brain injury August 19th, 2016

Lab team spins ginger into nanoparticles to heal inflammatory bowel disease August 19th, 2016

Research partnerships

New electrical energy storage material shows its power: Nanomaterial combines attributes of both batteries and supercapacitors August 25th, 2016

New theory could lead to new generation of energy friendly optoelectronics: Researchers at Queen's University Belfast and ETH Zurich, Switzerland, have created a new theoretical framework which could help physicists and device engineers design better optoelectronics August 23rd, 2016

A new way to display the 3-D structure of molecules: Metal-organic frameworks provide a new platform for solving the structure of hard-to-study samples August 21st, 2016

Researchers watch catalysts at work August 19th, 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