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UPI Correspondent Tucson (UPI) Sep 07, 2006 U.S. physicists at the University of Arizona have discovered how to turn single molecules into working transistors. "All transistors in current technology, and almost all proposed transistors, regulate current flow by raising and lowering an energy barrier," physicist Charles Stafford said. "Using electricity to raise and lower energy barriers has worked for a century of switches, but that approach is about to hit the wall." Transistors can't shrink much smaller than 25 nanometers because of energy problems, Stafford said. Even if that were possible, molecule-sized transistors using current technology would take a city's worth of electricity to run a laptop, which would probably become so hot it would vaporize, he said. Stafford, Arizona physicist Sumit Mazumdar and David Cardamone, who received his doctorate from the university in 2005, say their approach is "a little more finesse than brute force." "We don't put up a wall to stop current," said Cardamone. "It's just that we can regulate how electron waves combine to turn the transistor on or off." An article concerning the study is available on-line at the journal Nano Letters and the research is to appear in journal's November print edition.
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Carbon Nanotubes Are Printed On Paper
Troy, N.Y. (UPI) Sep 07, 2006U.S. scientists using an off-the-shelf inkjet printer have developed a technique for printing patterns of carbon nanotubes on paper and plastic surfaces. The research team says the method could lead to a new process for manufacturing a wide range of nanotube-based devices, from flexible electronics and conducting fabrics to sensors for detecting chemical agents. |
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