Donghua University has made the latest research achievements in the field of all fiber electronic skin

Recently, the research team of nanofibers led by academician Yu Jianyong and researcher Ding bin of Donghua University has made important progress in the field of all fiber structured electronic skin with high elasticity and breathability, which was published in advanced functional materials (DOI: 10.1002 / ADFM 201908411) The first author of the thesis is Associate Professor Li Zhaoling and the corresponding author is researcher Ding bin Biological skin is mainly responsible for defense and protection, perspiration and respiration, cold and heat perception, pressure and other functions Electronic skin, as a new wearable soft tactile sensor, has the basic function of biomimetic tactile perception, which is directly related to the intelligent and multi-functional carrier of the next generation robot, medical equipment, human prosthesis and wearable equipment It is an interdisciplinary and rapid development field In addition, the electronic skin can create or reconstruct the tactile sensing system to achieve the special functions that the biological skin does not have However, the energy demand of electronic skin restricts its development to flexibility, flexibility and miniaturization In addition, at present, most electronic skin uses dense and airtight membrane structure materials, which leads to skin inflammation and pruritus and other symptoms caused by long-term wearing of such sensors, which is difficult to meet the physiological needs of human body's thermal and wet comfort The development of electronic skin with excellent flexibility, mechanical response and air permeability is of great significance to promote the development of intelligent wearable field To solve these problems, the research team used electrospinning technology, based on the friction electrification and electrostatic induction effect, to prepare a nano all fiber self powered electronic skin PVDF nanofibers with high electronegativity and good mechanical properties are selected as the sensing layer, carbon nanofibers with excellent flexibility and conductivity are selected as the electrode layer, and Pu nanofibers with strong tensile property and chemical stability are selected as the electrode layer As the base layer, it overcomes the technical bottleneck of poor mechanical durability, mechanical response and breathability of nanofibers, and realizes the synchronous improvement of the sensitivity and breathability of the electronic skin The results show that the electronic skin has excellent sensing performance Under the condition of maximum 50% stretch deformation, the electronic skin pressure sensor array still maintains excellent sensing stability and mechanical durability, and the electronic skin with all fiber structure has good air permeability The prepared electronic skin has good conformability, can sensitively feel the changes of external pressure and the movement of human joints, and realize real-time high-precision spatial mapping on plane, curved surface and human body In addition, the electronic skin has the function of self power supply, without external power supply, and can be used as a power supply to drive some small electronic devices to work normally This work will improve new ideas for the development of intelligent electronic skin, and will have important application prospects in the future in the fields of intelligent robot, interactive equipment, artificial prosthesis and motion obstacle assistance The research work has been greatly supported by NSFC, Shanghai Natural Science Foundation, Shanghai Youth Science and Technology Star program, Donghua University inspirational program and other projects.