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Quantum dot nanotubes eliminate need for semiconductors

Posted: 11 Feb 2016 ?? ?Print Version ?Bookmark and Share

Keywords:Michigan Tech? nanotube? quantum dot? semiconductor? wearable?

Using the STM-TEM Yap's team has observed the quantum tunneling in action on bendable nanotubes, which they say will be perfect for flexible wearables. In addition to having zero-leakage when "off," when "on" the channel current encounters zero resistance. Unlike an ordinary transistor channel, the electrons are merely tunneling from quantum dot to quantum dot, making devices based on them ultra-low power since almost no energy is lost as heat when the transistors is on or off.

Yap's team has also observed the same action using gold quantum dots on BNNTs, using the same insulating boron-nitride nanotubes as the flexible tunneling channels. However, the iron quantum dots exert an averaging effect on the tunneling pathways, for randomly studded nanotubes, making their action more consistent and unaffected by bending.

Quantum tunneling on bendable nanotubes

Using a transmission electron microscope (TEM) the researchers observed quantum tunneling on bendable nanotubes. (Source: Michigan Tech)

"Iron has a higher melting point than gold and is more convenient to make a uniform distribution of quantum dots on BNNTs by annealing. We still can anneal gold quantum dots for the same purpose, but the current work chose to use iron for better distribution," Yap added.

- R. Colin Johnson
??EE Times

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