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    Breaking News

    Smart Artificial Skin Holds Prosthetic Promise

    New materials offer a big step toward adding a sense of touch to prosthetic limbs and other medical devices.

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    Joo Hyeon Heo, UNIST12.02.15
    Researchers have long been interested in the technology of artificial skins. Although previous studies have introduced an assortment of electronic skin (e-skin) elements, none of them were able to detect both pressure and heat with a high degree of sensitivity, until now.
     
    A Korean research team, affiliated with UNIST has developed a new form of e-skin that may share the capabilities that human skin has. Through this study, the team introduced human skin-inspired multimodal e-skins based on flexible and microstructured ferroelectric films, which enhance the detection and discrimination of multiple spatiotemporal tactile stimuli, such as static and dynamic pressure, temperature, and vibration.
     
    This study was jointly conducted by Prof. Hyunhyub Ko (School of Energy and Chemical Engineering) of UNIST and Prof. Heon Sang Lee (Department of Chemical Engineering) at Dong-A University.
     
    According to Prof. Ko, lead researcher of this study published in the October 30th issue of the journal Science Advances, “This is the first time in history that someone presents an e-skin that is capable of sensing so many different kinds of stimuli.”
     
    Indeed, as shown in the picture above, the functionalities of human skin are mimicked by elastomeric patterns (texture), piezoresistive (static pressure), ferroelectric (dynamic pressure and temperature), and interlocked microdome arrays (tactile signal amplification).
     
    In this study, Prof. Ko and his team placed a soft ridged film over bumpy plastic-and-graphene sheets about the thickness of a few layers of Saran Wrap. Touching the e-skin pressed electrodes on the bumpy sheets together, causing current to flow through the device, which was hooked up to a machine that meaures electrical signals. Electric current was also observed when heating the e-skin, showing that it could also sense temperature.
     
    Prof. Ko said, “Though the technology has yet to be tested outside the lab, the work takes a big step toward adding a sense of touch to prosthetic limbs and other wearable medical devices.
     
    This work has been supported by the National Research Foundation (NRF) of Korea, the Center for Advanced Soft Electronics funded by the Ministry of Science, ICT, and Future Planning as Global Frontier Project, and the Graphene Materials/Components Development Project funded by the Ministry of Trade, Industry & Energy of Korea.
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