Sign In

Communications of the ACM

ACM TechNews

Outstanding in Their Field Effect


View as: Print Mobile App Share: Send by email Share on reddit Share on StumbleUpon Share on Hacker News Share on Tweeter Share on Facebook

Rice University (RU) researchers have developed thin films of nanotubes made with ink-jet printers that offer a new way to make field-effect transistors (FETs). The technique does not scale down to the levels required for modern microprocessors, but it will be useful to inventors who want to print transistors on flexible substrates, says RU's Robert Vajtai.

The process involves the analysis of sample circuits printed with single-walled carbon nanotubes functionalized with four types of molecules. "The key is printing the appropriate number of layers to get the type of conduction you want, either metallic or semiconductive," Vajtai says. The researchers found that at room temperature, electrical transport took place through the network of semiconducting and metallic nanotubes, while at low temperatures, the semiconducting nanotubes became insulators, so electron tunneling between adjacent metallic nanotubes took over.

Vajtai says nanotube-based FETs are suited for logic-based applications that can be printed on a flexible surface but do not need a large number of circuits.

From Rice University
View Full Article

 

Abstracts Copyright © 2010 Information Inc., Bethesda, Maryland, USA


 

No entries found