Flexible sensor technology is a very challenging and potential development direction, and has broad development prospects in artificial intelligence, medical health and other fields. With the rapid development of human-computer interaction, sports health monitoring and other subdivisions, related products have put forward higher requirements for sensors. There is an urgent need for elastic sensing technology with flexible, bendable, stretchable, and recoverable characteristics. Meet the needs of human wearing comfort. Relying on the Ningbo Institute of Materials Technology and Engineering of the Chinese Academy of Sciences and the Key Laboratory of Magnetic Materials and Devices of the Chinese Academy of Sciences, the researchers focus on the development of key elastic sensors for information perception and key elastic conductors for information transmission in response to the above needs.
Developed an elastic conductor compatible with high conductivity and tensile stability
The composite conductive polymer is obtained by adding conductive substances (carbon black, carbon nanotubes, graphene, metal powder, metal nanowires and nanosheets, etc.) into the polymer matrix, and obtained by means of dispersion compounding, layering compounding, etc. . Because it maintains the excellent flexibility of polymer materials, it is currently the most ideal electrode material for flexible electronic components. However, because the conductive filler is solid, the elastic modulus of the substrate is very different (3-7 orders of magnitude), the spacing of the conductive filler will change during stretching, resulting in a significant change in the resistivity of the electrode, which affects the performance of the device. In order to solve this problem, our team used gallium indium tin (Galinstan), a liquid metal that is easy to deform and has good conductivity, as a conductive filler, and dispersed and composited with PDMS to prepare an elastic electrode. The electrode not only has good conductivity (
Elastoelectric sensor
Surface electromyography (SEMG) is a weak bioelectrical signal that appears with muscle activity. It has important practical value in clinical medicine, ergonomics, rehabilitation medicine, and sports science. SEMG has the advantages of non-invasiveness, non-invasiveness, and simple operation in measurement, but the signal is easily affected by the electrode, so it is particularly important to choose the appropriate electrode. At present, the commercial electromyography electrodes are mainly gel electrodes and metal electrodes. The gel electrode has good adhesion to the skin, but the water in the gel is easy to volatilize, the time stability is poor, and it is easy to cause skin allergies, and cannot be reused; the metal electrode has good conductivity, but the adhesion to the skin is poor, which is largely Movement is easy to slip, resulting in poor dynamic stability of the signal, and it is easy to scratch the skin. The researchers used the developed three-layer structure ultra-thin elastic electrode as the electromyography electrode. The impedance of the electromyography is equivalent to the gel electrode and the metal electrode in the working frequency range (20～400Hz), but it overcomes the time stability of the gel electrode. The problem of poor performance and poor dynamic stability of metal electrodes. The three-layer structure of the elastic electrode is used to measure the signal when the lateral head muscle of the leg gastrocnemius muscle moves, and compared with the traditional copper electrode, it can be clearly seen that the electromyographic signal measured by the three-layer structure ultra-thin elastic electrode is stronger About an order of magnitude, it shows a broader application prospect.
Developed flexible/elastic circuit, high-precision and stretchable strain sensor
Based on liquid metal wires, a recyclable paper-based flexible circuit has been developed. Its electrical conductivity is up to 10,000S/cm, and the bending cycle is more than 10,000 times. The composite thermal conductivity is 2-3 times that of paper, which improves the heat dissipation performance and the recovery rate is up to 90% per minute, further development of demonstration circuits such as paper-based LED displays. Based on flexible conductors, flexible earphone cords, flexible charging cords, etc. have been developed.
Utilizing the highly sensitive giant magneto-impedance effect and adopting the LC oscillator circuit structure, a highly sensitive flexible pressure sensor with digital pulse output is obtained. The detection limit is 10μN, which can sense the crawling of ants; for the first time, the micro-stress is realized at the same time in the low pressure detection range. Sensing and digital signal output; developed an elastic stress sensor compatible with high precision and stretchability, the stretch range is greater than 100%, the detection accuracy is ~0.05%, and it has excellent recovery characteristics.
Developed motion monitoring demonstration products for human-computer interaction
Developed smart gloves for gesture recognition, and realized the remote control of gestures on the manipulator; developed smart knee pads for knee joint movement monitoring, which realized the monitoring of joint movement during running, mountaineering and other actions.
Researchers have carried out patent layouts on materials, devices, methods, and equipment, and have applied for 30 patents (see the patent promotion section for details), including 23 invention patents, 14 authorized, and 7 utility model patents. Won the support of Ningbo Yinzhou Elite Leading Program and the first prize of Ningbo Zhenhai-Chinese Academy of Sciences Youth Promotion Association Entrepreneurship Competition.
Figure 1 Stretchable wire
Figure 2 Stretchable EMG sensor
Figure 3 Demonstration of smart knee pads
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