In Situ Graft-on Fibrous Composites and Nanostructure Interlocking Facilitate Highly Stable Wearable Sensors for SIDS Prevention
Kaifeng Chen, Weitao Wang, Zhihao Ye, Yabo Dong, Linpu Wan, Zijian Zhang, Cheng Lin, Liwu Liu, Jinsong Leng, Xinyu Wang, Wei Yang, Shaoxing Qu, Zongrong Wang
Advanced Fiber Materials ›› 2024, Vol. 6 ›› Issue (3) : 825-840.
In Situ Graft-on Fibrous Composites and Nanostructure Interlocking Facilitate Highly Stable Wearable Sensors for SIDS Prevention
High-performance and reliable wearable devices for healthcare are in high demand for the health monitoring of infants, ensuring that life-threatening events can be addressed promptly. Herein, the continuous monitoring of infant respiration for preventing sudden infant death syndrome (SIDS) is proposed using high-performance flexible piezoresistive sensors (FPS). The thorny challenges associated with FPS, including the signal drift and poor repeatability, are progressively improved via the employment of high-Tg matrix, the strengthening of in situ graft-on conducting polyaniline layer by β-cyclodextrin (β-CD), and the nanostructure interlocking between the piezoresistive layer and electrodes. The sensor presents high linear sensitivity (30.7 kPa−1), outstanding recoverability (low hysteresis up to 1.98% FS), static stability (4.00% signal drift after 24 h at 2.4 kPa) and dynamic stability (1.92% decay of signal intensity after 50,000 cycles). A wireless infant respiration monitoring system is developed. Respiration patterns and the real-time respiration rate are displayed on the phone. Notifications are implemented when abnormal status such as bradypnea and tachypnea is detected.
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