Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Boston College scientists stretch carbon nanotubes

19.01.2006


Research may influence future development of semiconductors, nanocomposites



Physicists at Boston College have for the first time shown that carbon nanotubes can be stretched at high temperature to nearly four times their original length, a finding that could have implications for future semiconductor design as well as in the development of new nanocomposites.

Single-walled carbon nanotubes are tiny cylinders thousands of times smaller than the width of a human hair but many times stronger than steel. The cylinders, which consist of carbon atoms interlinked in a hexagonal pattern, have novel properties that make them potentially useful in a wide range of applications.


At normal temperatures, carbon nanotubes snap when stretched to about 1.15 times their original length. But in a paper published in the Jan. 19, 2006, issue of the journal Nature, a team of physicists led by Boston College Research Associate Professor Jianyu Huang showed that at high temperatures nanotubes become extremely ductile. When heated to more than 2,000 degrees Celsius, one was stretched from 24 nanometres to 91 nanometres in length before it snapped.

The elongation was done by applying an electric current to the nanotube, which created a high temperature within the tiny structure and enabled the scientists to pull it like salt water taffy. Huang and his colleagues said their research indicates that nanotubes may be useful in strengthening ceramics and other nanocomposites at high temperatures.

At room temperature, a nanotube typically conducts electrons like a metal. But Huang said his team observed that when stretched under high temperature, a nanotube acts less like a metal and more like a semiconductor as the level of electrical current flowing through the structure falls. Huang said that raises the possibility that superplastic nanotubes could be used in developing new generations of computer chips.

Huang credited Boston College PhD student Shuo Chen with devising a special microscopic probe that allowed researchers to grab one end of the nanotube and stretch it while an electric current flowed through it. Other members of the team included Boston College physics faculty Zhifeng Ren, Ziqiang Wang and Kris Kempa; Boston College postdoctoral fellow Sung-Ho Jo; and professors Gang Chen and Mildred Dresselhaus at the Massachusetts Institute of Technology and Dr. Morris Wang at the Lawrence Livermore National Laboratory in California.

Greg Frost | EurekAlert!
Further information:
http://www.bc.edu

More articles from Physics and Astronomy:

nachricht Space radiation won't stop NASA's human exploration
18.10.2017 | NASA/Johnson Space Center

nachricht Study shows how water could have flowed on 'cold and icy' ancient Mars
18.10.2017 | Brown University

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Neutron star merger directly observed for the first time

University of Maryland researchers contribute to historic detection of gravitational waves and light created by event

On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...

Im Focus: Breaking: the first light from two neutron stars merging

Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.

Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....

Im Focus: Smart sensors for efficient processes

Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).

When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...

Im Focus: Cold molecules on collision course

Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.

How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...

Im Focus: Shrinking the proton again!

Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.

It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ASEAN Member States discuss the future role of renewable energy

17.10.2017 | Event News

World Health Summit 2017: International experts set the course for the future of Global Health

10.10.2017 | Event News

Climate Engineering Conference 2017 Opens in Berlin

10.10.2017 | Event News

 
Latest News

Osaka university researchers make the slipperiest surfaces adhesive

18.10.2017 | Materials Sciences

Space radiation won't stop NASA's human exploration

18.10.2017 | Physics and Astronomy

Los Alamos researchers and supercomputers help interpret the latest LIGO findings

18.10.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>