Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > IBM Scientists Create Method to Measure the Performance of Carbon Nanotubes as Building Blocks for Ultra Tiny Computer Chips of the Future

Vibrations give color to light allowing us to locally measure charges in a nanoscale electronic device.
Vibrations give color to light allowing us to locally measure charges in a nanoscale electronic device.

Abstract:
Observing Vibration and Light at the Nanoscale to Advance the Use of Carbon Nanotubes as Semiconductors and Metal Wires Inside Chips

IBM Scientists Create Method to Measure the Performance of Carbon Nanotubes as Building Blocks for Ultra Tiny Computer Chips of the Future

YORKTOWN HEIGHTS, NY | Posted on October 14th, 2007

IBM (NYSE: IBM) scientists today announced that they have measured the distribution of electrical charges in tubes of carbon that measure less than 2 nanometers in diameter, 50,000 times thinner than a strand of human hair.

This novel technique, which relies on the interactions between electrons and phonons, provides a detailed understanding of the electrical behavior of carbon nanotubes, a material that shows promise as a building block for much smaller, faster and lower power computer chips compared to today's conventional silicon transistors.

Phonons are the atomic vibrations that occur inside material, and can determine the material's thermal and electrical conductivity. Electrons carry and produce the current. Both are important features of materials that can be used to carry electrical signals and perform computations.

The interaction between electrons and phonons can release heat and impede electrical flow inside computer chips. By understanding the interaction of electrons and phonons in carbon nanotubes, the researchers have developed a better way to measure their suitability as wires and semiconductors inside of future computer chips.

In order to make carbon nanotubes useful in building logic circuitry, scientists are pushing to demonstrate their high speed, high packing density and low power consumption capabilities as well as the ability to make them viable for potential mass production.

"The success of nanoelectronics will largely depend on the ability to prepare well characterized and reproducible nano-structures, such as carbon nanotubes," said Dr. Phaedon Avouris, IBM Fellow and lead researcher for IBM's carbon nanotube efforts. "Using this technique, we are now able to see and understand the local electronic behavior of individual carbon nanotubes."

To date, researchers have been able to build carbon nanotube transistors with superior performance, but have been challenged with reproducibility issues. Carbon nanotubes are sensitive to environmental influences. For example, their properties can be altered by foreign substances, affecting the flow of electrical current and changing device performance. These interactions are typically local and change the density of electrons in the various devices of an integrated circuit, and even along a single nanotube.

A better understanding of how the local environment affects the electrical charge of a carbon nanotube is needed to allow the fabrication of more reliable transistors. Therefore, the ability to measure local electron density changes in a nanotube is essential. A team of researchers from the IBM's T.J. Watson Research Center in Yorktown Heights have just solved this problem.

This achievement was published online October 14, 2007 in the journal Nature Nanotechnology. The team monitored the color of the light scattered from the nanotube (Raman Effect), and measured small changes in the color of the light corresponding to changes in the electron density in the nanotube. The technique takes advantage of the interaction between the motion of the atoms and the motion of the electrons, so that electron density changes can be reflected in changes of the frequency of the vibrational motion of the nanotube atoms.

In March 2006, IBM announced that its researchers built the first complete electronic integrated circuit around a single carbon nanotube molecule.

For more information about IBM Research, visit http://www.research.ibm.com/ .

####

For more information, please click here

Contacts:
Lizette Kodama
IBM Media Relations
914-945-2703

Copyright © Market Wire

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

Chip Technology

Photonic chip guides single photons, even when there are bends in the road February 16th, 2018

Graphene on toast, anyone? Rice University scientists create patterned graphene onto food, paper, cloth, cardboard February 13th, 2018

Liquid crystal molecules form nano rings: Quantized self-assembly enables design of materials with novel properties February 7th, 2018

Nanometrics Selected for Fab-Wide Process Control Metrology by Domestic China 3D-NAND Manufacturer: Latest Fab Win Includes Comprehensive Suite for Substrate, Thin Film and Critical Dimension Metrology February 7th, 2018

Nanotubes/Buckyballs/Fullerenes/Nanorods

Nanotube fibers in a jiffy: Rice University lab makes short nanotube samples by hand to dramatically cut production time January 11th, 2018

Touchy nanotubes work better when clean: Rice, Swansea scientists show that decontaminating nanotubes can simplify nanoscale devices January 4th, 2018

Paving the way for a non-electric battery to store solar energy: UMass Amherst scientists say a polymer chain organized like a string of Christmas lights assists energy storage December 22nd, 2017

Nanotubes go with the flow to penetrate brain tissue: Rice University scientists, engineers develop microfluidic devices, microelectrodes for gentle implantation December 19th, 2017

Discoveries

Computers aid discovery of new, inexpensive material to make LEDs with high color quality February 20th, 2018

Unconventional superconductor may be used to create quantum computers of the future: They have probably succeeded in creating a topological superconductor February 19th, 2018

Photonic chip guides single photons, even when there are bends in the road February 16th, 2018

'Living bandages': NUST MISIS scientists develop biocompatible anti-burn nanofibers February 15th, 2018

Announcements

Oxford Instruments announces Dr Kate Ross as winner of the 2018 Lee Osheroff Richardson Science Prize for North and South America February 20th, 2018

Computers aid discovery of new, inexpensive material to make LEDs with high color quality February 20th, 2018

Unconventional superconductor may be used to create quantum computers of the future: They have probably succeeded in creating a topological superconductor February 19th, 2018

Photonic chip guides single photons, even when there are bends in the road February 16th, 2018

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project