Many researchers have long been keen on artificial skin technology. Although previous studies have introduced the concept of e-skin, none of them can detect pressure and heat at the same time with high sensitivity. Until now, a Korean research team affiliated with Ulsan University of Science and Technology (UNIST) has developed a new form of electronic skin that can have the function of human skin. Inspired by human skin, the research team introduced multimode electronic skin based on flexible microstructured ferroelectric thin films. The electronic skin enhances the ability to detect and discriminate multiple temporal and spatial tactile stimuli, such as static and dynamic pressure, temperature and vibration.
The study was jointly conducted by Hyunhyub Ko, a professor at the UNST School of Energy and Chemical Engineering, and Heon Sang Lee, a professor of chemical engineering at the University of East Asia.
Professor Hyunhyub Ko, who directed the study, published the study in the 30th issue of Science Advances, published on October 30, stating: "This is the first electronic skin in history that can sense so many different stimuli."
The electronic skin mimics the function of human skin through an elastomer pattern (texture), piezoresistive (static pressure), ferroelectric (dynamic pressure and temperature), and a micro-dome array (haptic signal amplification).
In this study, Professor Ko and his team placed a soft ridge film on plastic and graphene sheets of the same thickness as the cling film. When the electronic skin is touched, the electrodes on the uneven surface are squeezed together, allowing current to flow through the device, which can be connected to a machine that processes the electrical signals. When heating the electronic skin, there is also a current indicating that it can detect the temperature.
Professor Ko said: "Although the technology is still in the experimental phase, this work has taken a big step in the development of prosthetics and other wearable medical devices."
This work has been supported by a number of institutions including the Korea National Research Foundation (NRF), the Korea Advanced Electronics Center funded by the Ministry of Science and Technology, and ICT.
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