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

Switching to spintronics: Berkeley Lab reports on electric field switching of ferromagnetism at room temp December 17th, 2014

ORNL microscopy pencils patterns in polymers at the nanoscale December 17th, 2014

Unraveling the light of fireflies December 17th, 2014

First Home-Made Edible Herbal Nanodrug Presented to Pharmacies across Iran December 17th, 2014

Chip Technology

Switching to spintronics: Berkeley Lab reports on electric field switching of ferromagnetism at room temp December 17th, 2014

Pb islands in a sea of graphene magnetise the material of the future December 16th, 2014

Stanford team combines logic, memory to build a 'high-rise' chip: Today circuit cards are laid out like single-story towns; Futuristic architecture builds layers of logic and memory into skyscraper chips that would be smaller, faster, cheaper -- and taller December 15th, 2014

Stacking two-dimensional materials may lower cost of semiconductor devices December 11th, 2014

Nanoelectronics

Stacking two-dimensional materials may lower cost of semiconductor devices December 11th, 2014

Defects are perfect in laser-induced graphene: Rice University lab discovers simple way to make material for energy storage, electronics December 10th, 2014

Nanoscale resistors for quantum devices: The electrical characteristics of new thin-film chromium oxide resistors that can be tuned by controlling the oxygen content detailed in the 'Journal of Applied Physics' December 9th, 2014

'Giant' charge density disturbances discovered in nanomaterials: Juelich researchers amplify Friedel oscillations in thin metallic films November 26th, 2014

Discoveries

Switching to spintronics: Berkeley Lab reports on electric field switching of ferromagnetism at room temp December 17th, 2014

ORNL microscopy pencils patterns in polymers at the nanoscale December 17th, 2014

Unraveling the light of fireflies December 17th, 2014

Fraud-proof credit card possible because of quantum physics December 16th, 2014

Announcements

Switching to spintronics: Berkeley Lab reports on electric field switching of ferromagnetism at room temp December 17th, 2014

ORNL microscopy pencils patterns in polymers at the nanoscale December 17th, 2014

Unraveling the light of fireflies December 17th, 2014

First Home-Made Edible Herbal Nanodrug Presented to Pharmacies across Iran December 17th, 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