Shen Yangyang,Yang Wenke,Hu Fudong,Zheng Xuwei,Zheng Yanjun,Liu Hu,Algadi Hassan,Chen Kui
Real-time physiological signal monitoring is very essential to evaluate the function recovery, and the construction of ultrasensitive strain sensor has become the key technique and research hotspot in cardiac rehabilitation. Here, piezoresistive conductive polymer composites (CPCs)–based strain sensor, of which the conductive MXene/AgNW composite film served as the sensing materials and the flexible and stretchable thermoplastic polyurethane (TPU) acted as the supporting layer, was developed and further pre-strain treated to construct the ultrasensitive microcrack structure. Importantly, changing the mass percentage of MXene, sample thickness, and pre-strain amplitude can effectively tune the microcrack structure to achieve the optimization of strain-sensing performance of the sensor. As a result, the prepared strain sensor exhibits an ultrahigh sensitivity (gauge factor (GF) = 602), wide working range (90% strain), low detection limit (0.2%), rapid response and recovery time (60 ms/70 ms), and long-term durability over 1000 cycles. As a proof of concept, it can accurately monitor the pulse rate and respiration rate under different sports states and the simulated breathing modes, which will undoubtedly provide strong guarantee for the real-time health monitoring during the treadmill exercise and assessment of cardiac status. This work will undoubtedly possess a great guidance in the evaluation of cardiac rehabilitation.
Yangyang Shen,Yi Zhao,Minghua Tian,Yanlong Zhao,Wenke Yang,Xuwei Zheng,Wei Zhai,Hu Liu
Conductive hydrogels have gained enormous attention for their promising applications in personal health management, medical rehabilitation and human-machine interaction. However, it is still very necessary to develop a multifunctional hydrogel intrinsically integrating dual strain/temperature sensing and thermochromism. Herein, a multifunctional and highly stretchable PAM-PNIPAm-PEDOT: PSS (MNP) hydrogel was developed using a simple and efficient free radical polymerization strategy. The MNP hydrogel not only demonstrates good stretchability (1050 %), transparency and adhesion performance, but also possesses excellent strain sensing performance including wide sensing range (1050 % strain), high sensitivity (maximum GF of 5.72), ultralow detecting limit (0.5 % strain) and good cycle stability (1500 stretching-releasing cycles). These features facilitate its integration into wearable systems, such as smart gloves for gesture recognition and Morse-code-based information transmission. Additionally, its application in cardiac rehabilitation has been validated through real-time monitoring of lower limb movement and temperature fluctuations, offering valuable feedback for personalized training and health management. Moreover, the MNP hydrogel also demonstrates reversible transparency conversion and exceptional temperature-sensing capabilities, enhancing its potential for personalized cardiac rehabilitation and optimizing training intensity.
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