Sensor develops human skin-like quality

University of Toronto develops AISkin
University of Toronto Professor Xinyu Liu, one of the researchers developing AISkin. (University of Toronto)

University of Toronto Engineering researchers have developed a super-stretchy, transparent and self-powering sensor that records the complex sensations of human skin.

Dubbed artificial ionic skin—or AISkin for short—the researchers believe the properties of AISkin could lead to future advancements in wearable electronics, personal health care and robotics, according to an article on the University of Toronto’s website.

"Since it's hydrogel, it's inexpensive and biocompatible—you can put it on the skin without any toxic effects. It's also very adhesive, and it doesn't fall off, so there are so many avenues for this material," said Professor Xinyu Liu, in an article on the University of Toronto’s website. Liu focuses on the emerging areas of ionic skin and soft robotics.

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The adhesive AISkin comprises two oppositely charged sheets of stretchable substances known as hydrogels. By overlaying negative and positive ions, the researchers create what they call a "sensing junction" on the gel's surface.

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When the AISkin is subjected to strain, humidity or changes in temperature, it generates controlled ion movements across the sensing junction, which can be measured as electrical signals such as voltage or current.

"If you look at human skin, how we sense heat or pressure, our neural cells transmit information through ions—it's really not so different from our artificial skin," Liu said.

AISkin is also uniquely tough and stretchable. "Our human skin can stretch about 50 percent, but our AISkin can stretch up to 400 percent of its length without breaking," said Binbin Ying, a visiting PhD candidate from McGill University who's leading the project in Liu's lab. The researchers recently published their findings in Materials Horizons.

AISkin could lead to skin-like Fitbits that measure multiple body parameters, or an adhesive touchpad you can stick onto the surface of your hand, added Liu. "It could work for athletes looking to measure the rigor of their training, or it could be a wearable touchpad to play games."

The skin could also measure the progress of muscle rehabilitation. "If you were to put this material on a glove of a patient rehabilitating their hand for example, the health care workers would be able to monitor their finger-bending movements," said Liu.

Another application is in soft robotics—flexible bots made completely out of polymers. An example is soft robotic grippers used in factories to handle delicate objects such as light bulbs or food. The researchers envision AISkin being integrated onto soft robots to measure data, whether it's the temperature of food or the pressure necessary to handle brittle objects.

Over the next year, Liu's lab will focus on further enhancing AISkin, aiming to shrink the size of AISkin sensors through microfabrication. They'll also add bio-sensing capabilities to the material, allowing it to measure biomolecules in body fluids such as sweat.

 

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