Stretchable and Ultrasensitive Intelligent Sensors for Wireless Human–Machine Manipulation

Abstract

Metallic two‐dimensional conductive nanomaterials are extensively explored in stretchable strain sensors, which have promising applications ranging from health monitoring to human–machine manipulation. However, there are limited materials available in this category, and their sensing abilities need to be strengthened. Herein, a controllable deoxidation–nitridation strategy via the pyrolysis of an amine nitrogen source to synthesize oxygen‐doped vanadium nitride (VNO) nanosheets with high conductivity is reported. Its metallic characteristics and low dimensionality, together with layer‐to‐layer slippage make VNO particularly suitable for stretchable strain sensors with remarkable performance, including extraordinary sensitivity (a maximum gauge factor of 2667), wide detection range (0–100%), high durability (over 6000 cycles), and rapid response (44 ms). Furthermore, the strain sensors can capture various physiological signals; in particular, a state‐of‐the‐art wireless vehicle control system designed for differently abled people is fabricated based on the sensors. Moreover, by engineering the thickness of the VNO layer, it can behave as an elastic conductor, demonstrating its feasibility for stretchable wiring.

Full-Fiber Auxetic-Interlaced Yarn Sensor for Sign-Language Translation Glove Assisted by Artificial Neural Network

“…Figure 3 c shows a response time of 25 ms ( t rs ) while loading and unloading a 15% strain to the sensor with high speed and holding it for 5 s. The t rs ( t rc ) is defined as t rs ( t rc ) = t rs0 ( t rc0 ) – t 0 , where t rs0 ( t rc0 ) is the measured response or recovery time and t 0 denotes the time required for strain loading or unloading [ 24 ]. More tests on the loading in different strains (0–20%) shows that the response and recovery timed of AIYS are less than 50 and 150 ms, respectively (Fig.…”

Compressible Zn–Air Batteries Based on Metal–Organic Frameworks Nanoflake‐Assembled Carbon Frameworks for Portable Motion and Temperature Monitors

“…Keeping up with the booming development in the fields of biomedicine and healthcare, active identifications, and flexible electronics recently, wearable, portable, and miniaturized electronic devices have been arising numerous amounts of attentions, among which human physical signs monitoring technology shows a promising application prospect, [1][2][3][4] especially under epidemic stage of COVID-19. Wearable sensing systems featuring affordable cost, simple manufacturing, have played an essential role in monitoring technology.…”

Electrolyte Dynamics Engineering for Flexible Fiber-Shaped Aqueous Zinc-Ion Battery with Ultralong Stability

“…Portable and wearable electronic devices have shown fascinating application potential in various fields such as electronic skins, on-body monitoring, and wearable communications. − Flexible batteries with high specific capacity, long cycle life, and high safety are therefore highly desired for the practical applications of wearable electronics. − Among them, flexible aqueous zinc-ion batteries (ZIBs) have received widespread attention because of the abundant reserves (about 300 times higher than that for lithium), low redox potential (−0.76 V versus standard hydrogen electrode), high theoretical capacity (820 mAh g –1 or 5,854 mAh cm –3 ), and inherent safety of the metal zinc anode. − However, restricted by the flexible electrode materials, the existing flexible aqueous ZIBs generally have poor cycle life and low flexibility, which has seriously limited their development and practical applications in flexible and wearable electronics.…”