Human skin is an active, sensitive and highly elastic sensory organ that protects the body, perspires, regulates temperature, senses heat and pressure. The human somatosensory system can convert external environmental stimuli into electrical impulse signals through the receptors such as touch, temperature and pain in the skin, and conduct them through the nerve pathway to the nerve center, thereby enabling the skin to obtain sensory functions such as touch and pain. Based on this versatile biological model of skin, scientists have developed a new research project called tactile electronics (commonly known as "Electronic Skin", E-skin), which mimics the sensory functions of the skin such as touch and temperature perception. And other functions. At present, electronic skins are made on flexible or flexible substrates with sensors and arrays that detect pressure, temperature or other stimuli. They can sense various physical, chemical, biological and other signals in the surrounding environment, which will help develop new human-machine interfaces. Intelligent systems such as intelligent robots and bionic prostheses. In addition, an important development trend of electronic skin is the simultaneous monitoring of multi-functionality and multiple stimuli.
Recently, under the guidance of Pan Caofeng, a researcher at the Beijing Institute of Nano-Energy and Systems, Chinese Academy of Sciences, and Wang Zhonglin, a foreign academician of the Chinese Academy of Sciences, Pan Caofeng's research group, Ph.D., Kirin, and associate researcher Bao Rongrong proposed a flexible and stretchable multi-function. The integrated sensor array has successfully extended the detection capability of electronic skin to 7 types, real-time synchronous monitoring of various external stimuli such as temperature, humidity, ultraviolet light, magnetic, strain, pressure and proximity. The researchers used micro-nano processing technology to prepare a polyimide (PI) tensile structure network with large magnification (8 times and above, which can be designed as needed), including many sensor nodes and 蜿蜒 tensile structures. Based on this stretched structure network, a variety of sensors can be multi-functionally integrated in a two-dimensional distributed or three-dimensional stacked structure, and multiple sensing units can work independently without affecting each other. By utilizing the stretchability of the substrate, the detection area of ​​the electronic skin can be expanded, which facilitates further functional expansion. In addition, the researchers used this electronic skin to create a smart prosthetic with a custom-made functional integration that not only gives the prosthetic tactile function, but also gives the prosthetic limb the ability to sense temperature. The research will help develop new intelligent systems such as human-machine interfaces, intelligent robots, and bionic prostheses. The multi-functional integrated electronic skin can also simultaneously monitor various variables in the surrounding environment for human health monitoring and other fields.
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