Chinese scientists created the first bio-inspired electronic skin in history. Its three-dimensional structure replicates the three mechanical signals present in human skin.
The human skin has a complex 3D distribution of sensory receptors that enable it to detect strain and external pressures. Researchers at Tsinghua University created an e-skin that mimics the spatial distribution of human skin, complete with an “epidermis,” “dermis,” and “subcutaneous tissue.”
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According to a new study published in the journal Science, this e-skin can simultaneously decode and perceive three mechanical signals at the physical level: pressure, friction, and strain.
According to Zhang Yihui, the study’s corresponding author, “a patch of the e-skin, comparable in size to the tip of an index finger, is equipped with 240 metal sensors, each ranging in size from two to three hundred micrometers.”
“Their spatial arrangement closely mimics the distribution of tactile receptor cells within human skin,” Zhang stated.
Deep learning algorithms carefully examine and enhance the sensor data, giving the biomimetic skin the ability to accurately recognize the texture and contours of an object.
The study found that it demonstrates an impressive pressure position perception resolution of approximately 0.1 millimeters, comparable to the sensitivity of real human skin.
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Medical robots could be equipped with e-skin embedded into their fingertips to enable accurate early-stage diagnosis and interventions. Zhang claims that it can also be applied as a band-aid to provide real-time monitoring of critical health parameters like heart rate and blood oxygen saturation.
Zhang worked with his colleagues in the Laboratory of Flexible Electronics Technology, the Department of Engineering Mechanics, and the Applied Mechanics Laboratory at Tsinghua University to undertake this study.
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