Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Researchers show how to measure conductance of carbon nanotubes, one by one

Adam W. Tsen/Provided
This 3D microscopic image of a simple nanotube device is taken with photothermal current microscopy performed in Jiwoong Park's lab. The two yellow blocks are electrodes, and strung between them are carbon nanotubes. The strength of each nanotube's electrical signal is visible according to its brightness.
Adam W. Tsen/Provided
This 3D microscopic image of a simple nanotube device is taken with photothermal current microscopy performed in Jiwoong Park's lab. The two yellow blocks are electrodes, and strung between them are carbon nanotubes. The strength of each nanotube's electrical signal is visible according to its brightness.

Abstract:
A single batch of carbon nanotubes -- molecular carbon cylinders that may one day revolutionize electronics engineering -- often includes more than 100 types of tubes, each with different optical and electrical properties. Individual electrical measurements of the molecules typically require such slow and expensive methods as electron-beam lithography.

Researchers show how to measure conductance of carbon nanotubes, one by one

ITHACA, NY | Posted on December 16th, 2008

But now a team of Cornell researchers has invented an efficient, inexpensive method to electrically characterize individual carbon nanotubes, even when they are of slightly different shapes and sizes and are networked together.

Led by Jiwoong Park, Cornell assistant professor of chemistry and chemical biology, the group has demonstrated how to measure electrical conductance of both a single nanotube, and up to 150 of them arrayed together, using a single set of electrodes and the heat from a laser. The method is called photothermal current microscopy and could be a major step toward full manipulation of carbon nanotubes in electronic device engineering. It would be especially useful, Park said, for analyzing nanostructures when they are difficult to distinguish from one another.

"There is this tremendous excitement about nanostructures and nanoscale devices," Park said. "But there are a number of things we still need to figure out. One is, we have to be able to measure a large number of them simultaneously so we can have better control when we synthesize them. And that's easier said than done."

The results are reported in Nature Nanotechnology (already online and forthcoming in print Vol. DOI: 10.1038/NNano.2008.363). Collaborators include first author Adam W. Tsen, a graduate student of applied physics; Luke A.K. Donev, a graduate student of physics; Huseyin Kurt, a former postdoctoral associate at Harvard University; and Lihong H. Herman, a graduate student of applied physics.

For their technique, the researchers attached a pair of electrodes to the ends of an array of carbon nanotubes. They then used a laser to heat one nanotube at a time, which reduced the amount of electrical current flowing through it. The conductance change was proportional to the conductance of the nanotube being hit by the laser.

In essence, the nanotubes became temperature sensors, Park explained, and their conductance changes helped the researchers characterize which nanotubes were more or less conductive.

The research is supported by the Air Force Office of Scientific Research and the National Science Foundation.

####

For more information, please click here

Contacts:
Anne Ju
(607) 255-9735


Media Contact:
Blaine Friedlander
(607) 254-8093

Copyright © Cornell University

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

How to maximize the superconducting critical temperature in a molecular superconductor: International team led by Tohoku University opens new route for discovering high Tc superconductors April 19th, 2015

Engineer improves rechargeable batteries with MoS2 nano 'sandwich' April 18th, 2015

Nanocomposites Play Effective Role in Production of Smart Fibers April 18th, 2015

Dais Analytic Corporation Appoints Eliza Wang to Board of Directors: Company's Newest Director Brings Expertise in Commercial and Legal Matters Both in the United States and China; Joins on the Heels of Successful Business Development Trade Mission to China April 18th, 2015

Govt.-Legislation/Regulation/Funding/Policy

Engineer improves rechargeable batteries with MoS2 nano 'sandwich' April 18th, 2015

New Biological Nano-Fertilizers Presented in Iran as Appropriate Replacements for Chemical Fertilizers April 18th, 2015

Beyond the lithium ion -- a significant step toward a better performing battery April 18th, 2015

Oxford Instruments commissions high field outsert magnet system for the National High Magnetic Field Laboratory 32 Tesla magnet program April 17th, 2015

Chip Technology

Nanotubes with two walls have singular qualities: Rice University lab calculates unique electronic qualities of double-walled carbon nanotubes April 16th, 2015

Graphenea embarks on a new era April 16th, 2015

Quantization of 'surface Dirac states' could lead to exotic applications April 15th, 2015

Study shows novel pattern of electrical charge movement through DNA April 14th, 2015

Nanotubes/Buckyballs/Fullerenes

How to maximize the superconducting critical temperature in a molecular superconductor: International team led by Tohoku University opens new route for discovering high Tc superconductors April 19th, 2015

Nanotubes with two walls have singular qualities: Rice University lab calculates unique electronic qualities of double-walled carbon nanotubes April 16th, 2015

MIT sensor detects spoiled meat: Tiny device could be incorporated into 'smart packaging' to improve food safety April 15th, 2015

Taking aircraft manufacturing out of the oven: New technique uses carbon nanotube film to directly heat and cure composite materials April 14th, 2015

Nanoelectronics

Nanotubes with two walls have singular qualities: Rice University lab calculates unique electronic qualities of double-walled carbon nanotubes April 16th, 2015

Solution-grown nanowires make the best lasers April 14th, 2015

Water makes wires even more nano: Rice University lab extends meniscus-mask process to make sub-10 nanometer paths April 6th, 2015

Demonstration of 50GHz Ge Waveguide Electro-Absorption Modulator April 2nd, 2015

Discoveries

How to maximize the superconducting critical temperature in a molecular superconductor: International team led by Tohoku University opens new route for discovering high Tc superconductors April 19th, 2015

Optical resonance-based biosensors designed for medical applications April 18th, 2015

Iranian Foodstuff, Agricultural Industries Welcome Nanotechnology Packaging Bags April 18th, 2015

Nanocomposites Play Effective Role in Production of Smart Fibers April 18th, 2015

Announcements

How to maximize the superconducting critical temperature in a molecular superconductor: International team led by Tohoku University opens new route for discovering high Tc superconductors April 19th, 2015

Iranian Foodstuff, Agricultural Industries Welcome Nanotechnology Packaging Bags April 18th, 2015

Nanocomposites Play Effective Role in Production of Smart Fibers April 18th, 2015

Dais Analytic Corporation Appoints Eliza Wang to Board of Directors: Company's Newest Director Brings Expertise in Commercial and Legal Matters Both in the United States and China; Joins on the Heels of Successful Business Development Trade Mission to China April 18th, 2015

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 1999-2015 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE