The first-of-a-kind demonstration indicates that a greener future for the electronics sector is possible. Duke University engineers have created the world's first printed electronics that can be fully recycled. Their innovative solution replaces the use of harmful chemicals with water during the fa
An artistic depiction of the new process that allows printers to create fully functioning, fully recyclable transistors using only water instead of harsh chemicals. Credit: Ella Maru Studios
In previous work, Franklin and his group demonstrated the first fully recyclable printed electronics. The devices used three carbon-based inks: semiconducting carbon nanotubes, conductive, and insulating nanocellulose. In trying to adapt the original process to only use water, the carbon nanotubes presented the largest challenge.
“You want the carbon nanotubes to look like al dente spaghetti strewn down on a flat surface,” said Franklin. “But with a water-based ink, they look more like they’ve been taken one by one and tossed on a wall to check for doneness. If we were using chemicals, we could just print multiple passes again and again until there were enough nanotubes. But water doesn’t work that way. We could do it 100 times and there’d still be the same density as the first time.
Compared to a resistor or capacitor, a transistor is a relatively complex computer component used in devices such as power control or logic circuits and sensors. Franklin explains that, by demonstrating a transistor first, he hopes to signal to the rest of the field that there is a viable path toward making some electronics manufacturing processes much more environmentally friendly.
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