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New 3-D Printed 'Bionic Skin' Give Robots the Ability to Feel

by Bidita Debnath on May 11, 2017 at 11:41 PM
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 New 3-D Printed 'Bionic Skin' Give Robots the Ability to Feel

Researchers have come up with a revolutionary process for 3D printing stretchable electronic sensory devices that could give robots the ability to feel their environment.

The University of Minnesota discovery is also a major step forward in printing electronics on real human skin. Lead researcher Michael McAlpine said that this stretchable electronic fabric has many practical uses. He noted that putting this type of 'bionic skin' on surgical robots would give surgeons the ability to actually feel during minimally invasive surgeries, which would make surgery easier instead of just using cameras like they do now.

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These sensors could also make it easier for other robots to walk and interact with their environment. McAlpine added that this new discovery could also be used to print electronics on real human skin. This ultimate wearable technology could eventually be used for health monitoring or by soldiers in the field to detect dangerous chemicals or explosives. "While we haven't printed on human skin yet, we were able to print on the curved surface of a model hand using our technique," McAlpine continued. "We also interfaced a printed device with the skin and were surprised that the device was so sensitive that it could detect your pulse in real time." McAlpine and his team made the unique sensing fabric with a one-of-a kind 3D printer they built in the lab.

The multifunctional printer has four nozzles to print the various specialized "inks" that make up the layers of the device--a base layer of silicone, top and bottom electrodes made of a conducting ink, a coil-shaped pressure sensor, and a sacrificial layer that holds the top layer in place while it sets. The supporting sacrificial layer is later washed away in the final manufacturing process. Surprisingly, all of the layers of "inks" used in the flexible sensors can set at room temperature. Conventional 3D printing using liquid plastic is too hot and too rigid to use on the skin. These flexible 3D printed sensors can stretch up to three times their original size.
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"This is a completely new way to approach 3D printing of electronics," McAlpine said. "We have a multifunctional printer that can print several layers to make these flexible sensory devices. This could take us into so many directions from health monitoring to energy harvesting to chemical sensing." The researchers said that the next step is to move toward semiconductor inks and printing on a real body. "The possibilities for the future are endless," McAlpine said. The research is published online in Advanced Materials.

Source: ANI
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