With the development of artificial intelligence technology, a variety of stretchable electronic devices that emulate human characteristics, wearable electronic devices, and revolutionary functional products such as electronic skin have attracted great interest from researchers. They can be like human skin or tissue. It is as soft and elastic as it is, and it is closely integrated with the human body in an unprecedented way, and it realizes many functions that cannot be realized now or even can't be imagined. At the same time, it can further improve human health and quality of life, and greatly facilitate our lives. People believe that these products will have new applications and breakthroughs in the future human-computer interaction, electronic skin, health care and other fields.
At present, many studies have been made on transparent stretchable conductors and electronic devices, including using a certain geometry, using intrinsic stretchable conductors, and using elastomer composites to improve the device's stretchability. However, Large-scale integration, transparent and stretchable tactile sensors still pose certain challenges. Recently, Pan Caofeng’s research team at the Beijing Institute of Nano Energy and Systems, Chinese Academy of Sciences, developed a transparent stretchable system based on the principle of friction nano-generators. Triboelectric Tactile Sensor (TETS). The device combines high transparency, high pressure sensitivity, stretchability and multi-touch operation, and can simultaneously achieve biomechanical energy collection, tactile perception and other functions, for the preparation of transparent can pull Telescopic sensors provide a new perspective. Research results are published in Advanced Materials.
The researchers used electrospinning technology to prepare large-area PVA nanofiber films, followed by Ag nanofibers, which have excellent electrical conductivity and light transmission (1.68-11.1Ω sq-1, light transmittance greater than 70%). Device design, as well as microfabrication and wet etching processes, produce highly transparent, high pressure sensitive, stretchable touch sensors. This method is simple to operate, low cost, and easy to prepare on a large scale. The tensile properties of Ag nanofibers with different orientations on the device explain the charge transfer mechanism of the device in the stretched state. It was found that the randomly oriented Ag nanofibers prepared by the experiment have a resistance change amount of 100% under tension. Only 10%, and can detect the pressure as low as 4.4Pa and has a response time of about 70ms. In addition, through the use of an optimized cross array structure, its 8×8 array tactile sensor can realize real-time trajectory detection of irregular planes. This kind of device has a broad market prospect, and has potential application value in human-computer interaction, self-driven robots, flexible display screens and wearable electronic devices.
