Press Release 07-055
The Longest Carbon Nanotubes You've Ever Seen
Crafted with breakthrough manufacturing technique, centimeter-long fibers are visible to the naked eye
May 10, 2007
Using techniques that could revolutionize manufacturing for certain materials, researchers have grown carbon nanotubes that are the longest in the world. While still slightly less than 2 centimeters long, each nanotube is 900,000 times longer than its diameter.
The fibers--which have the potential to be longer, stronger and better conductors of electricity than copper and many other materials--could ultimately find use in smart fabrics, sensors and a host of other applications.
To grow the aligned bundles of tiny tubes, the researchers combined advantages of chemical vapor deposition (CVD), a technique for creating thin coatings that is especially common in the semiconductor industry, with a novel substrate and catalyst onto which the carbon attaches.
Supported by the National Science Foundation (NSF) and the Office of Naval Research, University of Cincinnati (UC) professors Vesselin Shanov and Mark Schulz collaborated with post-doctoral researcher Yun Yeo Heung and students to develop the technique.
The researchers partnered with First Nano, a division of CVD Equipment Corp. of Ronkonkoma, N.Y., to use their laboratory and a specialized furnace called the EasyTube 3000. With the equipment, the researchers were able to break apart hydrocarbons to create a vapor of carbon-atom starting material. Within the vapor sat the new substrate--a catalyst made of alternating metal and ceramic layers atop an oxidized-silicon wafer base--which served as the foundation for growth.
"This process is revolutionary because it allows us to keep the catalyst 'alive' for a long period of time thus, providing fast and continuous transport of the carbon 'building blocks' to the carbon nanotube growth zone," said Shanov.
The carbon nanotubes are extremely long compared to predecessors--the longest is 3 millimeters beyond the prior world record. More important for manufacturing, the research team grew a 12-millimeters-thick, uniform carpet of aligned carbon nanotubes on a roughly 10-centimeter silicon substrate, opening the door for scaling-up the process.
The inventions were presented in April 2007 at the Single Wall Carbon Nanotube Nucleation and Growth Mechanisms workshop organized by NASA and Rice University. The research was supported by NSF grant 0510823, in addition to support from the Office of Naval Research through North Carolina A&T SU.
Additional information is available in the University of Cincinnati press release at: http://www.uc.edu/news/NR.asp?id=5700
Joshua A. Chamot, NSF, (703) 292-7730, firstname.lastname@example.org
Wendy Beckman, University of Cincinnati, (513) 556-1826, email@example.com
Shih Chi Liu, NSF, (703) 292-7017, firstname.lastname@example.org
Jimmy Hsia, NSF, (703) 292-7020, email@example.com
Mihail C. Roco, NSF, (703) 292-8301, firstname.lastname@example.org
Mark Schulz, University of Cincinnati, (513) 556-4132, Mark.email@example.com
Vesselin Shanov, University of Cincinnati, (513) 556-2461, Vesselin.firstname.lastname@example.org
The National Science Foundation (NSF) is an independent federal agency that supports fundamental research and education across all fields of science and engineering. In fiscal year (FY) 2012, its budget was $7.0 billion. NSF funds reach all 50 states through grants to nearly 2,000 colleges, universities and other institutions. Each year, NSF receives about 50,000 competitive requests for funding, and makes about 11,500 new funding awards. NSF also awards about $593 million in professional and service contracts yearly.
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