Self‐powered high‐resolution smart insole system for plantar pressure mapping

Abstract

Accurate plantar pressure mapping systems with low dependence on the external power supply are highly desired for preventative healthcare and medical diagnosis. Herein, we propose a self-powered smart insole system that can perform both static and dynamic plantar pressure mapping with high accuracy. The smart insole system integrates an insole-shaped sensing unit, a multi-channel data acquisition board, and a data storage module. The smart insole consists of a 44-pixel sensor array based on triboelectric nanogenerators (TENGs) to transduce pressure to the electrical signal. By optimizing the sensor architecture and the system's robustness, the smart insole achieves high sensitivity, good error-tolerance capability, excellent durability, and short response-recovery time. Various gait and mobility patterns, such as standing, introversion/extraversion, throwing, and surpassing obstacles, can be distinguished by analyzing the acquired electrical signals. This work paves the way for self-powered wearable devices for gait monitoring, which might enable a new modality of medical diagnosis.

Spaced-Confined Janus Engineering Enables Controlled Ion Transport Channels and Accelerated Kinetics for Secondary Ion Batteries

“…Then, the mechanism of capacitive energy storage induced by the surface current is proposed. According to the reported works, , due to the high specific surface area of nanoparticles, the high carrier migration rate and more active sites can be provided. Therefore, more ions can be absorbed on the surface or near the surface of Janus Co/Co 2 P@CNT-CS, leading to a large ratio of pseudocapacitance performance, as shown in Figure h.…”

Facile surface functionalization of triboelectric layers via electrostatically self-assembled zwitterionic molecules for achieving efficient and stable antibacterial flexible triboelectric nanogenerators

“…1–5 With these intriguing features, TENG have shown promising prospects in the fields of energy harvesting technology and self-powered wearable and implantable sensors. 1,3–7 To ensure the high power output of TENG, the surface charge density of triboelectric layers should be maximized, which is mainly governed by their ability to receive or lose electrons. 8–10 To date, several attempts have been made to develop new triboelectric layers that are capable of generating high triboelectric charge density.…”

Dielectric-Enhanced, High-Sensitivity, Wide-Bandwidth, and Moisture-Resistant Noncontact Triboelectric Sensor for Vibration Signal Acquisition

“…Triboelectric nanogenerator (TENG) is a promising technology for energy harvesting and self-powered sensing based on the coupling effect of friction electrification and electrostatic induction. − Recently, triboelectric sensors (TESs) used for vibration signal acquisition have been investigated a lot due to their simple structure and low-cost fabrication. − However, TESs operated in mechanical vibration signal acquisition, contact, and separation periodically lead to wear of the triboelectric layer inevitably. Noncontact TES works without mechanical contact, showing a great advantage in self-powered sensing signal acquisition. − …”