ALBUQUERQUE, N.M -- Unexpected voltage increases of up to 25 percent in two barely separated nanowires have been observed at Sandia National Laboratories.
Designers of next-generation devices using nanowires to deliver electric currents including telephones, handheld computers, batteries and certain solar arrays may need to make allowances for such surprise boosts.
"People have been working on nanowires for 20 years," says Sandia lead researcher Mike Lilly. "At first, you study such wires individually or all together, but eventually you want a systematic way of studying the integration of nanowires into nanocircuitry. That's what's happening now. It's important to know how nanowires interact with each other rather than with regular wires."
Though the gallium-arsenide nanowire structures used by Lilly's team are fragile, nanowires in general have very practical characteristics they may crack less than their bigger cousins, they're cheaper to produce and they offer better electronic control. [images available at Sandia news release site]
For years, the best available test method required researchers to put a charged piece of material called a gate between two nanowires on a single shelf. The gate, flooded with electrons, acted as a barrier: It maintained the integrity, in effect, of the wires on either side of it by repelling any electrons attempting to escape across it. But the smallest wire separation allowed by the gate was 80 nanometers. Nanowires in future devices will be packed together much more closely, so a much smaller gap was necessary for testing.
The current test design has the brilliance of simplicity. What Lilly and co-workers at McGill University in Montreal envisioned was to put the nanowires one above the other, rather than side by side, by separating them with a few atomic layers of extremely pure, home-grown crystal. This allowed them to test nanowires separated vertically by only 15 nanometers about the distance
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DOE/Sandia National Laboratories