Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

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

Harris & Harris Group Notes Announcements by Its Portfolio Companies During the Third Quarter of 2016 September 30th, 2016

INVECAS to Enable ASIC Designs for Tomorrows Intelligent Systems on GLOBALFOUNDRIES' FDX Technology: INVECAS to Collaborate with GLOBALFOUNDRIES to Provide IP and End-to-End ASIC Design Services on 22FDX and 12FDX Technologies September 30th, 2016

How to power up graphene implants without frying cells: New analysis finds way to safely conduct heat from graphene to biological tissues September 30th, 2016

Innovation in Nanotechnology is Focus of Symposium: Annual event brings international experts to Northwestern Oct. 6 September 29th, 2016

Govt.-Legislation/Regulation/Funding/Policy

How to power up graphene implants without frying cells: New analysis finds way to safely conduct heat from graphene to biological tissues September 30th, 2016

Crystalline Fault Lines Provide Pathway for Solar Cell Current: New tomographic AFM imaging technique reveals that microstructural defects, generally thought to be detrimental, actually improve conductivity in cadmium telluride solar cells September 26th, 2016

Tattoo therapy could ease chronic disease: Rice-made nanoparticles tested at Baylor College of Medicine may help control autoimmune diseases September 23rd, 2016

PHENOMEN is a FET-Open Research Project aiming to lay the foundations a new information technology September 19th, 2016

Chip Technology

INVECAS to Enable ASIC Designs for Tomorrows Intelligent Systems on GLOBALFOUNDRIES' FDX Technology: INVECAS to Collaborate with GLOBALFOUNDRIES to Provide IP and End-to-End ASIC Design Services on 22FDX and 12FDX Technologies September 30th, 2016

Picosun patents ALD nanolaminate to prevent electronics from overheating September 28th, 2016

Researchers at the Catalan Institute of Nanoscience and Nanotechnology show that bending semiconductors generates electricity September 26th, 2016

Mexican scientist in the Netherlands seeks to achieve data transmission ... speed of light September 20th, 2016

Nanotubes/Buckyballs/Fullerenes

Semiconducting inorganic double helix: New flexible semiconductor for electronics, solar technology and photo catalysis September 15th, 2016

World's most powerful X-ray takes a 'sledgehammer' to molecules September 14th, 2016

Researchers design solids that control heat with spinning superatoms: Carnegie Mellon University and Columbia University collaborators discover the cause of vastly different thermal conductivities in superatomic structural analogues September 8th, 2016

For first time, carbon nanotube transistors outperform silicon September 8th, 2016

Nanoelectronics

Mexican scientist in the Netherlands seeks to achieve data transmission ... speed of light September 20th, 2016

GLOBALFOUNDRIES to Deliver Industrys Leading-Performance Offering of 7nm FinFET Technology: Company extends its leading-edge roadmap for products demanding the ultimate processing power September 15th, 2016

Semiconducting inorganic double helix: New flexible semiconductor for electronics, solar technology and photo catalysis September 15th, 2016

A versatile method to pattern functionalized nanowires: A team of researchers from Hokkaido University has developed a versatile method to pattern the structure of 'nanowires,' providing a new tool for the development of novel nanodevices September 9th, 2016

Discoveries

How to power up graphene implants without frying cells: New analysis finds way to safely conduct heat from graphene to biological tissues September 30th, 2016

Nanosensors could help determine tumors ability to remodel tissue: Measuring enzyme levels could help doctors select appropriate treatments September 29th, 2016

Fighting cancer with sticky nanoparticles September 27th, 2016

Gold nanoparticles conjugated quercetin inhibits epithelial-mesenchymal transition, angiogenesis and invasiveness via EGFR/VEGFR-2 mediated pathway in breast cancer September 27th, 2016

Announcements

Harris & Harris Group Notes Announcements by Its Portfolio Companies During the Third Quarter of 2016 September 30th, 2016

INVECAS to Enable ASIC Designs for Tomorrows Intelligent Systems on GLOBALFOUNDRIES' FDX Technology: INVECAS to Collaborate with GLOBALFOUNDRIES to Provide IP and End-to-End ASIC Design Services on 22FDX and 12FDX Technologies September 30th, 2016

How to power up graphene implants without frying cells: New analysis finds way to safely conduct heat from graphene to biological tissues September 30th, 2016

Innovation in Nanotechnology is Focus of Symposium: Annual event brings international experts to Northwestern Oct. 6 September 29th, 2016

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







Car Brands
Buy website traffic