Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Lack of thermoelectric effect is cool feature in carbon nanotubes

Photo by L. Brian Stauffer
Jean-Pierre Leburton, left, a professor of electrical and computer engineering, and physics graduate student Marcelo Kuroda collaborated on theory that explains the absence of the thermoelectric effect in metallic carbon nanotubes.
Photo by L. Brian Stauffer
Jean-Pierre Leburton, left, a professor of electrical and computer engineering, and physics graduate student Marcelo Kuroda collaborated on theory that explains the absence of the thermoelectric effect in metallic carbon nanotubes.

Abstract:
Metallic carbon nanotubes have been proposed as interconnects in future electronic devices packed with high-density nanoscale circuits.

Lack of thermoelectric effect is cool feature in carbon nanotubes

Champaign, IL | Posted on January 15th, 2009

But can they stand up to the heat?

Recent experiments have shown the absence of the thermoelectric effect in metallic carbon nanotubes. Building upon earlier theoretical work, researchers at the University of Illinois say they can explain this peculiar behavior, and put it to good use.

"Our work shows that carbon nanotubes that come in metallic form have different thermal and electrical properties than normal conductors," said Jean-Pierre Leburton, the Gregory Stillman Professor of Electrical and Computer Engineering at Illinois and co-author of a paper published in the Dec. 19 issue of the journal Physical Review Letters, and in the Jan. 5 issue of the Virtual Journal of Nanoscale Science and Technology.

"Specifically, metallic carbon nanotubes don't exhibit the thermoelectric effect, which is a fundamental property of conductors by which a current flows because of a temperature difference between two points of contact," said Leburton, who is also affiliated with the Beckman Institute, the Micro and Nanotechnology Laboratory, and the Frederick Seitz Materials Research Laboratory. "This is a metal, which doesn't behave like an ordinary metal."

In a normal conductor, a current can be induced by applying a potential difference (voltage) or by creating a temperature difference between two contacts. Electrons will flow from the higher voltage to the lower, and from the higher temperature to the lower. There is a similarity between temperature imbalance and electric field.

In metallic carbon nanotubes, however, the lack of the thermoelectric effect means no current will flow because of temperature change between two contacts. The similarity between temperature imbalance and voltage disappears.

This is a fundamental property of metallic carbon nanotubes, Leburton said, peculiar to their particular structure. Semiconductor nanotubes, which possess a different chirality, behave differently.

Also, in normal conductors, electrons can acquire a range of velocities, with some traveling much faster than others. In metallic carbon nanotubes, however, all electrons travel at the same velocity, similar to the behavior of photons. Heating the nanotube does not change the electron velocity.

"This means metallic carbon nanotubes offer less resistance than other metal conductors," Leburton said. "And, in high-density circuits, metallic carbon nanotube interconnects would reduce heat losses and require far less cooling than copper nanowires."

With Leburton, physics graduate student Marcelo Kuroda is co-author of the paper. The current work is an extension of theoretical work Leburton, Kuroda and electrical and computer engineering professor Andreas Cangellaris first published in the Dec. 21, 2005, issue of Physical Review Letters.

####

For more information, please click here

Contacts:
James E. Kloeppel
Physical Sciences Editor
217-244-1073


Jean-Pierre Leburton
217-333-6813

Copyright © University of Illinois at Urbana-Champaign

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 News Press

News and information

Light pulses control graphene's electrical behavior: Finding could allow ultrafast switching of conduction, and possibly lead to new broadband light sensors August 1st, 2014

President Obama Meets U.S. Laureates of 2014 Kavli Prizes August 1st, 2014

Stanford researchers seek 'Holy Grail' in battery design: Pure lithium anode closer to reality with development of protective layer of interconnected carbon domes August 1st, 2014

Air Force’s 30-year plan seeks 'strategic agility' August 1st, 2014

Chip Technology

Pressure probing potential photoelectronic manufacturing compound July 31st, 2014

Nanometrics Reports Second Quarter 2014 Financial Results July 30th, 2014

A*STAR and industry form S$200M semiconductor R&D July 25th, 2014

A Crystal Wedding in the Nanocosmos July 23rd, 2014

Nanoelectronics

A*STAR and industry form S$200M semiconductor R&D July 25th, 2014

A Crystal Wedding in the Nanocosmos July 23rd, 2014

3-D nanostructure could benefit nanoelectronics, gas storage: Rice U. researchers predict functional advantages of 3-D boron nitride July 15th, 2014

IBM Announces $3 Billion Research Initiative to Tackle Chip Grand Challenges for Cloud and Big Data Systems: Scientists and engineers to push limits of silicon technology to 7 nanometers and below and create post-silicon future July 10th, 2014

Discoveries

Iranian Scientists Produce Cobalt–Alumina Ceramic Nano Inks August 1st, 2014

Light pulses control graphene's electrical behavior: Finding could allow ultrafast switching of conduction, and possibly lead to new broadband light sensors August 1st, 2014

Taking the guesswork out of cancer therapy: New molecular test kit predicts patient’s survival and drug response August 1st, 2014

Carnegie Mellon Chemists Create Nanofibers Using Unprecedented New Method July 31st, 2014

Announcements

Light pulses control graphene's electrical behavior: Finding could allow ultrafast switching of conduction, and possibly lead to new broadband light sensors August 1st, 2014

President Obama Meets U.S. Laureates of 2014 Kavli Prizes August 1st, 2014

Stanford researchers seek 'Holy Grail' in battery design: Pure lithium anode closer to reality with development of protective layer of interconnected carbon domes August 1st, 2014

Air Force’s 30-year plan seeks 'strategic agility' August 1st, 2014

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







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE