Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Vision Spectra Photonics Showcase Photonics ProdSpec Photonics Handbook
More News

Nanotubes in a Vacuum 'Excellent Conductors'

Facebook Twitter LinkedIn Email Comments
RIVERSIDE, Calif., May 9, 2006 -- Carbon nanotubes in a vacuum show excellent conductivity and can be very effective infrared detectors because of their high sensitivity to light, according to a University of California, Riverside (UCR) research team.

Robert Haddon, a professor of chemistry and chemical and environmental engineering at UCR, led the research team that conducted the research at the Center for Nanoscale Science and Engineering, which is a part of the College of Natural and Agricultural Sciences and the Bourns College of Engineering at UCR. He and the other researchers -- Mikhai Itkis, Ferenc Borondics and Aiping Yu -- recently reported their findings ("Bolometric Infrared Photoresponse of Suspended Single-Walled Carbon Nanotube Films") in Science.

Haddon said findings could be of great interest to the military and law enforcement, which often need to use infrared detection technology to look for people and vehicles at night, and to scientists, for infrared spectrometry and astronomy.

The UCR findings contradict previous studies of the photoconductivity of carbon nanotubes, which showed that when they were irradiated with light, carbon nanotubes had a weak response, suggesting low photoconductivity. However, those previous experiments placed the carbon nanotubes on a substrate that acted to dissipate much of the heat built up by irradiation, Haddon said.

The UCR experiment placed a .5-mm strip of purified carbon nanotubes that were suspended across two electrodes in a vacuum, with no substrate to dissipate the heat. The results generated anywhere from five to 10 orders of magnitude (105 to 106) of the amount of heat found in previous tests.

"We think this is due in large part to the lack of a substrate, which works like a heat sink to absorb much of the heat buildup," Haddon said. Placing the nanotube strip in a vacuum also eliminates heat loss via the air, he said.

For more information, visit:
May 2006
The scientific observation of celestial radiation that has reached the vicinity of Earth, and the interpretation of these observations to determine the characteristics of the extraterrestrial bodies and phenomena that have emitted the radiation.
astronomyBasic ScienceBolometric Infraredcarbon nanotubesdefenseinfrared detectorsNews & FeaturesRiversideRobert HaddonSensors & DetectorsspectroscopyUCRUniversity of Californiavacuum

back to top
Facebook Twitter Instagram LinkedIn YouTube RSS
©2019 Photonics Media, 100 West St., Pittsfield, MA, 01201 USA,

Photonics Media, Laurin Publishing
x We deliver – right to your inbox. Subscribe FREE to our newsletters.
We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.