Shuheng Dong,Dedong Guo,Qingzhou Wang,Huixin Yu,Qing Xu,Ho-Kun Sung,Zhao Yao,Yuanyue Li,Yang Li
Flexible pressure sensors have found widespread application in medical diagnosis and human–computer interaction. These practical applications often require large-area pressure sensing arrays (PSAs) to explore spatial pressure distributions. However, the development of high-performance PSAs still presents significant challenges. Here, a new method is proposed for the fabrication of a high-resolution capacitive PSA in a 10 × 10 configuration. The array comprises the upper and lower electrode arrays of laser-induced graphene patterned on polyimide films, as well as the sandwiched dielectric units based on electrospun nanofiber membranes of H 3 PO 4 @PVPP (cross-linked polyvinyl pyrrolidone). Experimental results indicate that the PSA exhibits high sensitivity across a wide pressure range (0–200 kPa), while offering a rapid response/recovery time of 24/41 ms (at 1 kPa), an exceptionally low detection limit of ∼1.2 Pa, and a good stability of 4000 cycles. Moreover, the crosstalk of the PSA was found to be as low as 1.3%. By employing the PSA in conjunction with a convolutional neural network algorithm, a human foot-arch diagnostic system was developed for accurate detection and quantification of the plantar pressure for different types of foot arches. Such technology has significant potential in clinical detection and disease diagnosis of human foot.
Soft piezocapacitive sensor, owing to its simple assembly and low power consumption, draws intensive interests for physiological monitoring. However, crosstalk between proximity sensing units and limited mechanically stretching suppressed its practical application for conventional capacitive sensor array. Here we report a stretchable iontronic pressure sensor (SIPS) array with low proximate crosstalk for epidermal monitoring. Benefiting from electric double layer (EDL) capacitance effect between robust aramid nanofiber (ANF) /MXene (Ti3C2Tx) composite electrode and ionic film, the SIPS exhibits a high sensitivity up to 521.69 kPa−1, low limit of detection (0.22 Pa), broad linear sensing range (200 kPa) and rapid response time (17 ms) as well as long-term stable working durability for 10,000 cycles. The serpentine island bridge structure enables the SIPS array to stretch up to 40%, allowing pulse and grip monitoring of a bent wrist and finger, respectively, through processing circuits. This demonstrates the promising application prospects in vital physiological monitoring.
危险品化学品经营许可证（带存储）