Abstract
The trends of wearable health monitoring systems have led to growing demands for gait-capturing devices. However, comfortability and durability under repeated stress are still challenging to achieve in existing sensor-enabled footwear. Herein, a flexible textile piezoresistive sensor (TPRS) consisting of a reduced graphene oxide (rGO)-cotton) fabric electrode and an Ag fabric circuit electrode is proposed. Based on the mechanical and electrical properties of the two fabric electrodes, the TPRS exhibits superior sensing performance, with a high sensitivity of 3.96 kPa-1 in the lower pressure range of 0–36 kPa, wide force range (0–100 kPa), fast response time (170 ms), remarkable durability stability (1000 cycles) and detection ability in different pressures ranges. For the prac-tical application of capturing plantar pressure, six TPRSs were mounted on a flexible printed circuit board and integrated into an insole. The dynamic plantar pressure distribution during walking was derived in the form of pressure maps. The proposed fully-textile piezoresistive sensor is a strong candidate for next-generation plantar pressure wearable monitoring devices.
Highlights
The flexible wearable devices, an unobtrusive sensing interface with the human body, have already become a key tool for capturing human physiological parameters [1,2,3,4]
Cotton textiles with large contact surfaces and excellent mechanical properties were introduced to designs for flexible sensing systems that are comfortable for the wearer [7]
The proposed sensor may be employed to feedback gait information and to assess health status for both hemiparetic patients and healthy individuals. These results demonstrated that the proposed insole is suitable for real-time gait monitoring in various environments
Summary
The flexible wearable devices, an unobtrusive sensing interface with the human body, have already become a key tool for capturing human physiological parameters [1,2,3,4]. Cotton textiles with large contact surfaces and excellent mechanical properties were introduced to designs for flexible sensing systems that are comfortable for the wearer [7]. Their ad-vantages are essential when capturing human information through a fully-wearable monitoring device. Piezoresistive pressure sensors possess tremendous potential for wearable device applications due to their excellent sensitivity, durability and biocompatibility with human skin [12,13,14,15,16,17] In these sensors, the external pressure stimuli induce a change in resistance, that can be measured and utilized as feedback about the information state of the human body.
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