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[ China Instrument Network Instrument Development ] In recent years, with the rapid advancement of electronic technology, more and more electronic devices are developing in the direction of miniaturization, flexibility and wearability. Flexible wearable sensors have received extensive attention and research due to their huge market potential in air quality testing, human motion detection, and health care.
In 2018, the team of Professor Yin Fuxing from the School of Materials Science and Engineering/Energy Equipment Materials Technology Institute of Hebei University of Technology, and Yuan Wenjing, a researcher in the field of flexible sensors, made a series of researches and made breakthroughs. Related research results are published in the Journal of Materials Chemistry A, ACS Applied Materials & Interfaces, Journal of Materials Chemistry C, Sensors and Actuators B-Chemical and other internationally renowned SCI journals.
Conventional planar structure films are not conducive to the diffusion and penetration of gas molecules. The research team proposed the preparation of MXene/polymer three-dimensional fiber skeleton in combination with electrospinning and self-assembly techniques. The three-dimensional framework provides a highly interconnected porous structure that facilitates the diffusion, adsorption and desorption of organic gas molecules. The MXene surface-rich modified functional groups (–OH, –O, –F, etc.) further provide active adsorption sites for gas molecules. The ultra-thin (single or oligo) MXene sensing layer can be obtained by self-assembly technology, and has a high specific surface area, which can effectively expose all active adsorption sites. The sensor operates continuously at room temperature and has high sensitivity (0.10-0.17 ppm-1) for trace polar organic gases (acetone, methanol and ethanol), low detection limit (50 ppb), and extremely wide sensing range (ppb) Grade to saturated vapor), as well as good reproducibility and reliability. At the same time, the sensor can be manipulated and used at room temperature with good flexibility and is expected to be integrated into portable wearable devices.
In addition, the research group used a spring-like core yarn as a flexible skeleton, and assembled a two-dimensional sheet structure graphene to obtain a core-spun-graphene composite mesh film as a conductive layer of a strain sensor instead of a flat surface conductive surface. Floor. The special spring-like mesh structure of the composite mesh membrane is extremely sensitive to external mechanical stimulation, which greatly improves the performance of the sensor in terms of sensitivity and detection limit. The sensor detects a variety of deformations such as stretching, bending, compression and weak vibration. High sensitivity, low detection limit, wide sensing range, good flexibility and stability. It can realize in-situ detection of human activities (such as joint bending), and physiological signals (such as pulse, breathing, etc.), providing technical support for the development of electronic skin, with important research significance and practical application value.
(Original title: Our school has made a series of research progress in the field of flexible wearable sensing)