submit news    HOME | FEEDBACK  


- Bio/Medicine

- Chemicals

- Defense

- Drug Delivery

- Education

- Electronics

- Energy

- Events

- Grants

- Industry

- Investment

- Litigation

- Materials


- Nanofabrication

- Nanoparticles

- Nanotubes

- Optics

- Partnership

- Patent

- Products

- Quantum dots

- Research

- Smart Dust

- Software

- Browse by Month

- Current Shows

- Previous Shows

- Submit Events

Become A Nanotechwire Partner

FEI Company

Veeco Instruments

Nano Science and Technology Institute

National Nanotechnology Initiative

Nanotechnology at Zyvex

Want to see your Company or Organization listed above? Become A Nanotechwire Partner Today - click here


4/22/2006 10:50:55 PM
Nanotube film’s sensitivity to light is much greater than previously thought and is demonstrated by a UCR research team

Researchers at the University of California, Riverside have shown for the first time that carbon nanotubes in a vacuum show excellent conductivity and can be very effective infrared detectors because of their high sensitivity to light.

The findings are published in a paper titled Bolometric Infrared Photoresponse of Suspended Single-Walled Carbon Nanotube Films, in today’s edition of the journal Science, co-authored by UCR researchers Mikhail Itkis, Ferenc Borondics and Aiping Yu, and led by Distinguished Professor of Chemistry and Chemical and Environmental Engineering Robert Haddon. The research was conducted 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.

“What you have is a substance that is very efficient at collecting light and converting that energy to heat,” Haddon said. “You have a material that is really well designed to function as an infrared detecting device.”

The 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 in nighttime situations. For scientist, the discovery could be beneficial for infrared spectrometry and astronomy.

The UCR findings contradict previous studies of the photoconductivity of carbon nanotubes, which showed that when 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 millimeter 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 - 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 added. Placing the nanotube strip in a vacuum also eliminates heat loss via the air.

Other Headlines from University of California, Riverside ...
 - Why Graphene Holds the Key to the Future
 - Engineering Professor Wins International Award for Pioneering Work Expected to Improve Electronic Devices
 - Nanorods Developed in UC Riverside Lab Could Greatly Improve Visual Display of Information
 - Lastest Graphene Research Could Lead to Improvements in Bluetooth Headsets and Other Wireless Devices
 - UC Riverside Physicists Pave the Way for Graphene-based Spin Computer

More Nanotubes Headlines ...
 - Free-standing single walled carbon nanotube thin films
 - Carbon Nanotubes Market - SWCNTs and MWCNTs Market Worth US$3.3 Billion by 2016 - Market Research
 - Bayer MaterialScience strengthens position in carbon nanotubes
 - New desalination process using carbon nanotubes
 - Ultra fast photodetectors out of carbon nanotubes

« Back To List »

- submit company
- submit news
- submit events
- advertise here

- More Events

Copyright © 2017 | Privacy Policy |