Navigation Links
Carbon nanotube avalanche process nearly doubles current
Date:2/9/2009

CHAMPAIGN, Ill. By pushing carbon nanotubes close to their breaking point, researchers at the University of Illinois have demonstrated a remarkable increase in the current-carrying capacity of the nanotubes, well beyond what was previously thought possible.

The researchers drove semiconducting carbon nanotubes into an avalanche process that carries more electrons down more paths, similar to the way a multilane highway carries more traffic than a one-lane road.

"Single-wall carbon nanotubes are already known to carry current densities up to 100 times higher than the best metals like copper," said Eric Pop, a professor of electrical and computer engineering at the U. of I. "We now show that semiconducting nanotubes can carry nearly twice as much current as previously thought."

As reported in the journal Physical Review Letters, the researchers found that at high electric fields (10 volts per micron), energetic electrons and holes can create additional electron-hole pairs, leading to an avalanche effect where the free carriers multiply and the current rapidly increases until the nanotube breaks down.

The sharp increase in current, Pop said, is due to the onset of avalanche impact ionization, a phenomenon observed in certain semiconductor diodes and transistors at high electric fields, but not previously seen in nanotubes.

While the maximum current carrying capacity for metallic nanotubes has been measured at about 25 microamps, the maximum current carrying capacity for semiconducting nanotubes is less established. Previous theoretical predictions suggested a similar limit for single-band conduction in semiconducting nanotubes.

To study current behavior, Pop, graduate student Albert Liao and undergraduate student Yang Zhao first grew single-wall carbon nanotubes by chemical vapor deposition from a patterned iron catalyst. Palladium contacts were used for measurement purposes. The researchers then pushed the nanotubes close to their b
'/>"/>

Contact: James E. Kloeppel, Physical Sciences Editor
kloeppel@illinois.edu
217-244-1073
University of Illinois at Urbana-Champaign
Source:Eurekalert

Page: 1 2

Related biology technology :

1. Sheet of carbon atoms acts like a billiard table, physicists find
2. Sheet of carbon atoms acts like a billiard table, physicists find
3. Researchers measure carbon nanotube interaction
4. The sensitive side of carbon nanotubes: Creating powerful pressure sensors
5. NASA Goddard Space Flight Centers carbon nanotube manufacturing technology wins Nano 50 Award
6. Understanding of actuator properties of carbon nanotubes bring micro machines closer
7. Improved wettability of carbon nanotubes opens the door to new possibilities
8. Growing tiny carbon nanotube wires to connect computer chips of the future
9. Carbon nanotubes to be replaced by MoSIx nanowires in high-tech devices says new study
10. FED-TVs with carbon nanotube technology could supersede plasma and LCD flat screens
11. Clemson researcher studies carbon fibers for nuclear reactor safety
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/22/2014)... 2014 Research and Markets has ... Enzymes, Kits, & Reagents (Cloning, Epigenetics, PCR, Restriction Digestion, ... their offering. The global molecular biology ... and is expected to grow at a CAGR of ... enzymes, kits, & reagents find applications in a large ...
(Date:8/22/2014)... Canada (PRWEB) August 22, 2014 ... in model organisms can be accelerated by exome ... and manufacturing technologies, the custom SeqCap EZ Developer ... research. , Mr. Watson will additionally present how ... with commercially available human and mouse exome kits. ...
(Date:8/21/2014)... PA & Rockville, MD (PRWEB) August 21, 2014 ... (ITI) is making progress in its development of ... to Japanese red cedar pollen. Phase IC studies began ... a real solution to hay fever. , The Japanese ... over 35 million people in Japan. Mountain Cedar pollen ...
(Date:8/21/2014)... 2014 2014 Deep Research ... a professional and in-depth research report on ... basic Seaweed Fertilizer information, including Seaweed Fertilizer ... as well as industry overview. This research ... market as well as global industry analysis ...
Breaking Biology Technology:Global Molecular Biology Enzymes, Kits, & Reagents (Cloning, Epigenetics, PCR, Restriction Digestion, Sequencing) Market - Forecast to 2018 2Global Molecular Biology Enzymes, Kits, & Reagents (Cloning, Epigenetics, PCR, Restriction Digestion, Sequencing) Market - Forecast to 2018 3Efficient Identification of Protein-Coding Variants in a Model Organism Through Exome Sequencing, New Webinar Hosted by Xtalks 2Relief for Allergy Sufferers Finally in Sight: Immunomic Therapeutics Closes in on Treatment for Hay Fever in Japan, U.S. 2Relief for Allergy Sufferers Finally in Sight: Immunomic Therapeutics Closes in on Treatment for Hay Fever in Japan, U.S. 3Relief for Allergy Sufferers Finally in Sight: Immunomic Therapeutics Closes in on Treatment for Hay Fever in Japan, U.S. 4Internationals Seaweed Fertilizer Industry 2014 Development Trend Analysis in New Research Study at DeepResearchReports.com 2Internationals Seaweed Fertilizer Industry 2014 Development Trend Analysis in New Research Study at DeepResearchReports.com 3
... Is your building technologically obsolete? Are you paying too ... in a building is very important in the selection ... important to current tenants who are contemplating a move ... today, some should be avoided because they offer nothing ...
... - NimbleGen Systems, Inc. , a supplier of ... new markets through newly obtained intellectual property rights from ... , ,The license agreement will allow NimbleGen to commercialize ... software, covered by Affymetrix patents. , ,The technology is ...
... Sunday morning, in the free-wheeling environment of Milwaukee's ... strategies from her forthcoming book, titled Shopping for ... publish next year. , ,In her seminar at this ... about maximizing efficiency and minimizing hurt feelings in the ...
Cached Biology Technology:Making sure YourSpace is technologically sound 2Making sure YourSpace is technologically sound 3Making sure YourSpace is technologically sound 4Making sure YourSpace is technologically sound 5NimbleGen extends research market reach 2BarCamp talk turns to Internet dating 2BarCamp talk turns to Internet dating 3
(Date:8/22/2014)... Thomson Reuters , a leading source of information ... the University of California, Riverside in its 2014 list ... our times." , To generate the list, the company ... researchers whose published work has had enormous impact. , ... 3,200 individuals who published the greatest number of highly ...
(Date:8/22/2014)... FASEB MARC (Maximizing Access to Research Careers) Program ... Grant Writing Seminar & Practical Exercises Workshop which will ... Maryland from August 25-26, 2014. These awards are ... research scientists from underrepresented groups in the the FASEB ... year MARC conferred 11 awards totaling $20,350. , The ...
(Date:8/22/2014)... captive black rhino reproduction in Europe highlights how ... programmes. , Researchers from Chester Zoo, The University ... out a six-year study which encompassed 90% of ... Edwards led the research as part of her ... "Although some black rhinoceros breed well in captivity, ...
Breaking Biology News(10 mins):5 UC Riverside scientists among world's most influential scientific minds 2Hormone analysis helps identify horny rhinos 2
... WASHINGTON, Oct. 18 Can skin cancer be treated ... Irvine), believe so. They,re exploring new ways to image cancerous ... cancer called photodynamic therapy (PDT) -- work that they will ... in Optics (FiO) 2010 at the Rochester Riverside Convention ...
... Health (NIH) have determined the complete genetic blueprints for ... bacteria that cause Lyme disease. The achievement should lead ... strains may result in different courses of illness in ... in North America. The wealth of new genetic data ...
... University of Michigan Heath System and their collaborators have ... help guide new treatments for psoriasis, one of the ... Using cutting-edge methods to peer into the hidden genetic ... published in Nature Genetics, further maps the ...
Cached Biology News:Treating cancer with light 2Four new psoriasis 'hotspots' identified by U-M geneticists 2
IHC detection kit for BrdU in cells and tissues...
The Hybrid Hunter Yeast Two-Hybrid System uses the activation of reporter genes to indicate positive protein-protein interactions. Two reporters are used an auxotrophic marker and lacZ....
Request Info...
... can be used for efficient, mild and ... for ELISA or other assays for protein ... are bound with high efficiency to the ... will not elute during the assay due ...
Biology Products: