Untraditional Deformation‐Driven Pressure Sensor with High Sensitivity and Ultra‐Large Sensing Range up to MPa Enables Versatile Applications

Abstract

A piezoresistive flexible pressure sensor with high sensitivity as well as ultra‐large sensing range up to MPa is proposed based on inelastic metallic microstructures and flat elastic polymer films. During the pressure loading process, the metallic microstructures continuously penetrate into the polymer film due to the rigid characteristic, resulting in continuous contact area variation and ultra‐large pressure sensing range of the pressure sensor. Polydimethylsiloxane (PDMS) and polyvinylidene difluoride (PVDF) are introduced to construct flexible pressure sensors, achieving elastic modulus tunable sensing performance. The pressure sensors exhibit high sensitivity, superior sensing range (300 kPa for PDMS, 1.4 MPa for PVDF), ultra‐fast response time (≈3.5 ms) as well as high stability (>10 000 cycles), enabling potential applications in monitoring human vital signs, such as wrist pulse, human movements, and gait recognition. In addition, an acceleration sensor is constructed based on the as‐fabricated pressure sensor, which is utilized for extensive applications in action identification, virtual reality, and vehicle safety systems. This work provides an alternative strategy to construct high performance pressure sensors.

A Wearable Sensor Based on Gold Nanowires/Textile and Its Integrated Smart Glove for Motion Monitoring and Gesture Expression

“…To record the human gait character and establish the correlation between the real-time movement and piezoresistive feedback, this AuNWs/textile device was fixed on different parts of foot for pressure signal sensing in response to three types of motion: bending (Figure 6f ), crouching (Figure 6g), stomping (Figure 6 h), and normal walking (Figure 6i). [53] Due to its good mechanic property and excellent flexibility, our AuNWs/textile device was able to Figure 6. Motion monitoring with the piezoresistive AuNWs/textile sensor for various body positions: a) elbow bending, b) neck bending, c) finger bending, d) wrist bending, e) knee bending, f ) foot status, g) crouching status, h) stomping status, and i) normal walking.…”

Hierarchically Microstructure-Bioinspired Flexible Piezoresistive Bioelectronics

“…Flexible and wearable pressure sensors with excellent force-to-electric conversion ability have made lots of promising applications in personal healthcare monitoring, , human–machine interaction, smart robotics, and sports detection. − In contrast to the piezoresistive, − piezocapacitive, piezoelectric, − and triboelectric sensors, − the piezoresistive sensors have been widely developed due to their simple structure, cost-effectiveness, and easy fabrication. Although considerable progress has been made in the sensitivity, detection limit, flexibility, and stability of the piezoresistive sensor, it is still highly desired to achieve both high sensitivity and wide linear detection range simultaneously. , …”

“…Although considerable progress has been made in the sensitivity, detection limit, flexibility, and stability of the piezoresistive sensor, it is still highly desired to achieve both high sensitivity and wide linear detection range simultaneously. 18,19 Most commonly, the effective medium theory-based piezoresistive sensor could inherently present good sensitivity but suffer from its natural viscoelasticity and thermal expansion, resulting in poor responsiveness and terrible thermal disturbance. 20 Alternatively, the contact resistance change based piezoresistive sensor can demonstrate excellent advantages of high sensitivity and fast response from the substantially magnified contact area.…”

High‐Sensitivity, Long‐Durability, and Wearable Pressure Sensor Based on the Polypyrrole/Reduced Graphene Oxide/(Fabric–Sponge–Fabric) for Human Motion Monitoring

“…[5][6][7] However, traditional pressure sensors are mostly prepared from rigid materials such as metals, semiconductors, and piezoelectric crystals. [8] Although these pressure sensors can accurately measure pressure values over a wide range, their disadvantages are becoming more and more obvious in the upcoming era of internet of things. For example, the large and rigid devices cannot withstand large deformation, which severely hinders their further applications in various flexible scenarios such as human-computer interaction, portable detection, intelligent robot, and so on.…”