Wang Zhonglin, academician of Beijing Institute of nano energy and system, Chinese Academy of Sciences

It is very important for the development of wearable electronic devices to use the flexible sensor with both energy acquisition and self driving signal sensing functions However, there are few reports about the combination of these two functions in an electronic skin device Recently, the research team of Academician Wang Zhonglin of Beijing Institute of nano energy and system of Chinese Academy of Sciences has designed a kind of stretchable and machine washable electronic skin friction nano generator, which is mainly used for mechanical energy collection and multi-functional pressure signal sensing (adv mater 2018, DOI: 10.1002/adma.201804944) Brief introduction of Academician Wang Zhonglin Wang Zhonglin, Ph.D., graduated from Arizona State University in 1987, is an international top nano scientist, energy technology expert, foreign academician of Chinese Academy of Sciences, academician of European Academy of Sciences, lifelong professor of Georgia Institute of technology, director of Beijing Institute of nano energy and system of Chinese Academy of Sciences, and Dean of College of nano science and technology of Chinese Academy of Sciences Professor Wang Zhonglin's main research direction is the theory and Application Research of nanomaterials science, including (1) synthesis, characterization, growth mechanism and application of ZnO nanomaterials; (2) controllable growth, characterization and application of nanomaterials; (3) nano energy technology and self driving nano system technology; (4) piezoelectric electronics and piezoelectric optoelectronics Professor Wang Zhonglin has published 1100 papers (including 12 science, 4 nature and 15 nature subjournals), 150 patents, 5 monographs and more than 20 edited books and conference Anthologies in the world-class journals He has been invited to give more than 900 lectures and special reports of the conference Published papers have been cited more than 145000 times, H factor 184 He is one of the top five authors in the field of materials and nanotechnology, ranking 25th in the world's most outstanding scientists Professor Wang Zhonglin won the most authoritative and prestigious Eni Award (frontier Energy Award) in the world energy field in 2018 Cutting edge scientific research achievements: a kind of stretchable yarn embedded friction nano generator as electronic skin for bio mechanical energy collection and multi-functional pressure sensing is an important way to develop intelligent equipment by simulating the basic characteristics of human skin through functional electronic equipment Electronic skin, which has similar sensing ability to human skin, has a wide range of research value in both commercial development and scientific research fields In order to have the unique function of human skin, electronic skin must be conformal with dynamic irregular surface, and can withstand a variety of complex and lasting mechanical stimulation, such as pressure, strain, torsion, etc In addition, as a multi-functional sensor, it must be able to meet the requirements of high extensibility, high sensitivity, wide acquisition frequency, and fast response speed Recently, the research team of Academician Wang Zhonglin of Beijing Institute of nano energy and system of Chinese Academy of Sciences published a research paper entitled "a stretchable yarn embedded triboelectric Nanogenerator aselectronic skin for biological energy harvesting and multifunctional pressure sensing" (adv mater 2018, DOI: 10.1002/adma.201804944) on adv mater ) In a simple and low-cost way, the research team prepared a stretchable and conformable friction nano generator as a functional electronic skin, which can simultaneously collect mechanical energy and sense a variety of external mechanical stimuli A continuous, planar chain like interwoven conductive network made of three twisted silver plated nylon yarns is embedded in the silicone elastomer This design endows the electronic skin friction Nanogenerator with sufficient transparency, good tensile property, high pressure sensitivity and excellent mechanical stability An 80 × 40m M 2 electronic skin can generate an open circuit voltage of 160 V and an average power output of 230 MW · m-2 These power outputs can light at least 170 LED lights, charge commercial capacitors, drive electronic watches, etc Moreover, it can also be used to monitor physiological signals of human body, such as arterial pulse and sound vibration In this paper, Wang Zhonglin's research team also designed an intelligent prosthesis, a real-time pedometer / speedometer, a flexible digital keyboard and a pressure sensor array with 8 × 8 pixels The electronic skin yarn embedded friction nano generator developed by the research team has a wide application prospect in wearable electronic equipment, humanoid robot, health monitoring and human-computer interface Figure 1 Structure design and working mechanism diagram of the electronic skin friction Nanogenerator (source: adv mater) Firstly, the author selected three twisted silver plated nylon yarns and silica gel elastic system to prepare the electronic skin friction Nanogenerator Three twisted silver plated nylon yarns are wound into a planar barrier network structure The electronic skin is transparent and stretchable, and can be conformal to any complex surface In addition, the author further revealed the working mechanism of friction nano power generation (Figure 1) Figure 2 Electrical output performance of the electronic skin friction Nanogenerator (source: adv mater.) in order to characterize the electrical output performance of the electronic skin friction Nanogenerator, the author further measured and analyzed the electrical output performance of different electrode materials and under different yarn electrode parameters The results show that when the width and height of the buckling wave of the filament wound electrode is 3.24 mm, the electronic skin has the maximum electrical output performance (Figure 2) Figure 3 Mechanical energy collection and physiological signal monitoring capability of the electronic skin friction Nanogenerator (source: adv mater.) Secondly, the author characterized the energy collection capability, pressure sensitivity and physiological monitoring capability of the electronic skin friction Nanogenerator The electronic skin can light at least 170 LED lights, charge commercial capacitors and drive small electronic equipment As a pressure sensor, the electronic skin can monitor human physiological signals in real time, such as human pulse beat or throat voice vibration (Figure 3) Figure 4 Multi functional application of the electronic skin friction nano generator as a pressure sensor (source: adv mater.) in addition, based on the high sensitivity of the electronic skin friction nano generator, the author also designed an intelligent prosthesis, a real-time pedometer / speedometer and a flexible digital keyboard These multi-functional applications further verify the application potential of the electronic skin friction nano generator as a pressure sensor in wearable electronic equipment (Figure 4) Figure 5 Stretchable pressure sensor array (source: adv mater.) finally, the author designed a stretchable pressure sensor array for real-time monitoring or quantification of plane stress distribution based on the above-mentioned electronic skin friction nano generator This electronic skin type pressure sensor array provides a simple, reliable and self powered method for the design of artificial electronic skin, which has potential applications in human-computer interaction interface, especially in multi-point touch equipment (Figure 5) Review of previous reports: Academician Wang Zhonglin, Beijing Institute of nano energy and systems, Chinese Academy of Sciences, research group: self powered full-scale pressure imaging system about people and scientific research are increasingly valued in the economic life of scientific and technological elements Today, China has ushered in the "node of science and technology explosion" Behind the progress of science and technology is the work of countless scientists In the field of chemistry, in the context of the pursuit of innovation driven, international cooperation has been strengthened, the influence of Returned Scholars in the field of R & D has become increasingly prominent, and many excellent research groups have emerged in China For this reason, CBG information adopts the 1 + X reporting mechanism CBG information, chembeangoapp, chembeango official microblog, CBG wechat subscription number and other platforms jointly launch the column of "people and scientific research", approach the domestic representative research group, pay attention to their research, listen to their stories, record their demeanor, and explore their scientific research spirit.