In Situ Graft-on Fibrous Composites and Nanostructure Interlocking Facilitate Highly Stable Wearable Sensors for SIDS Prevention

KF Chen and WT Wang and ZH Ye and YB Dong and LP Wan and ZJ Zhang and C Lin and LW Liu and JS Leng and XY Wang and W Yang and SX Qu and ZR Wang, ADVANCED FIBER MATERIALS, 6, 825-840 (2024).

DOI: 10.1007/s42765-024-00382-z

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 beta-cyclodextrin (beta- 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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