The team developed a cyclical process in which the device is rinsed with water, dried in relatively low heat, and printed on again.
. This time they've produced the same that replaces the use of chemicals with water in the fabrication process, in what can be called a first.
Recyclable printed electronics use three carbon-based inks: semiconducting carbon nanotubes, conductive graphene, and insulating nanocellulose.ink in which the carbon nanotubes don't clump together, a surfactant similar to detergent is added. However, the output does not create a layer of carbon nanotubes dense enough for a high current of electrons to travel across.to look like al dente spaghetti strewn down on a flat surface," said Franklin.
This happens because the surfactant prevents additional layers from adhering to the first. In traditional processes, the surfactants would be removed using high temperatures or harsh chemicals, which can pose human and environmental health risks. Franklin and his group developed a cyclical process in which the device is rinsed with water, dried in relatively low heat, and printed on again. "When the amount of surfactant used in the ink is also tuned down, the researchers show that their inks and processes can create fully functional, fully recyclable, fully water-based transistors," the release said.
The current fabrication technology is high-energy and relies on hazardous chemicals and toxic gases. According to Franklin, his approach could be used in the manufacturing of other electronic components like the screens and displays that are now ubiquitous to society. He intends 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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