XigongDa and others have successfully developed a flexible wearable strain fiber sensor

Performance characterization of super stretchable fiber strain transducers and human health monitoring applications.

Super stretchable fiber strain transducer.

Running status monitoring. Images are provided by the author of the paper

As a new type of portable electronic device, flexible wearable electronic systems have a wide range of applications in human-computer interaction, condition monitoring, health care and other fields. Wearable electronic systems with superior performance often require tough materials to guarantee their durability and stability. Because fibrous electronic materials are easier to integrate into wearable devices and have excellent structural flexibility, they become essential basic components in wearable electronic systems. However, the preparation of fiber materials with high mechanical strength and excellent tensile properties remains challenging.

Professor Wang Xuewen of Northwestern Polytechnical University’s academician team collaborated with Professor Song Weitao of Beijing Institute of Technology to publish the newly published “Advanced Materials” (Adv. Mater.) A flexible fiber strain transducer for human health monitoring is reported.

According to Professor Wang Xuewen, in this work, their R&D team cleverly used the strategy of coupling the mechanical properties of the outer layer and the inner core, and used a new polyurethane (PU) with high strength and high elasticity as the core of the conductive fiber sensor, which greatly enhanced the mechanical properties of the fiber strain sensor, realized the flexible fiber sensor with high mechanical strength and excellent tensile properties, and solved the problem that mechanical properties and tensile properties are incompatible.

In addition, they also use electrospinning technology to achieve controllable preparation of fiber sensors of different diameters, and through the joint action of microfiber network structure and packaging layer, the recovery hysteresis of fiber sensors is greatly reduced.

It is understood that the new fiber strain sensor has both excellent strain range (~700%) and high tensile strength (~17.6 MPa). Exhibits high sensitivity and ultra-high strain resolution (0.0075%) in strain detection, and enables accurate monitoring of low-frequency vibration signals from 0-40Hz. The R&D team implanted high-performance fiber strain sensors into the clothing and developed a flexible wearable intelligent health monitoring system, which can realize real-time monitoring of body tremors, pulses, breathing, gestures and 6 kinds of human movement postures.

Relevant experts believe that the results will help promote the development of health assessment and disease diagnosis technology in the direction of intelligence, efficiency and precision, provide new ideas for improving and improving the efficiency and quality of medical information transmission and processing, promote the development of transformative medical technologies such as telemedicine, “unmanned” medical treatment, and smart medical treatment, and provide important technical reserves for the realization of the intelligent era.

It is reported that this work has been supported by the National Key R&D Program (2020YFB2008501), the National Natural Science Foundation of China (11904289, 61960206007), the Natural Science Foundation of Shaanxi Province (2019JQ-613), the Shaanxi Provincial Key R&D Program (2020ZDLGY04-08, 2020GXLH-Z-027), the Ningbo Natural Science Foundation of China (202003N4003), The basic scientific research business expenses of central universities and the support of overseas scholars of Northwestern Polytechnical University. (Source: China Science Daily, Zhang Xingyong, Gao Jiuwei)

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