Porous AgNWs/Poly(vinylidene fluoride) Composite-Based Flexible Piezoresistive Sensor with High Sensitivity and Wide Pressure Ranges

Abstract

Flexible piezoresistive sensors are highly desirable for tactile sensing and wearable electronics. However, the reported flexible piezoresistive sensors have the inherent trade-off effect between high sensitivity and wide pressure ranges. Herein, we report a flexible piezoresistive sensor with a three-dimensional (3D) porous microstructured sensing layer composed of silver nanowires (AgNWs) and a poly(vinylidene fluoride) (PVDF) matrix, exhibiting high sensitivity and wide pressure ranges. Benefiting from the conductive networks of AgNWs and the 3D porous structure of PVDF, the porous AgNWs/PVDF composite (PAPC)-based flexible piezoresistive sensor exhibits high sensitivities of 0.014 and 0.009 kPa–1 in the wide pressure ranges of 0–30 and 30–100 kPa, respectively. In addition, the fabricated sensor also shows a fast response time of 64 ms, a low detection limit of 25 Pa, and long-term durability over 10,000 continuous cycles. The PAPC-based flexible piezoresistive sensor can accurately monitor various human physiological activities (ranging from subtle deformations to vigorous body movements) by quantitatively measuring the tactile sensation on human skin. This work indicates that the proposed sensor can be potentially applicable to mobile healthcare monitoring devices as well as next-generation wearable electronics.

Simultaneous Optimization of Sensitivity and Linearity for Flexible Pressure Sensor via Coupling Effect between Microstructures and Flat Substrate Component

“…We also compared the sensing performance of our proposed piezoresistive sensor with other reported literature results, as shown in Figure g (the detailed sensitivity and the corresponding linearity range as well as the employed materials are listed in Table ). With the simultaneously realized high sensitivity and ultrawide linearity range, our proposed sensor is competitive with these state-of-the-art reported sensors. ,,,− ,− It is worthwhile to note that the optimized sensing performance of our proposed sensor originated from the codeformation of the piezoresistive layer with the coupling effect of elastic modulus and conductivity. Such a unique mechanism avoids the high dependence on the complex design of materials and structures.…”

High strength, self-healing sensitive ionogel sensor based on MXene/ionic liquid synergistic conductive network for human-motion detection

“…Ionogels, polymer networks swollen with ionic liquids (ILs), have aroused much attention due to their ionic conductivity, high thermal and electrochemical stability, and excellent non-volatility. [8][9][10][11] Therefore, ionogels are expected to be used in wearable devices, energy storage devices, sensors, and other scenarios that require prolonged use. 12 The excellent conductivity of the ionogel is provided by the large amount of ionic liquids.…”

A Dual-Mode Flexible Sensor Based on the Combination of Triboelectric and Piezoresistive Sensing to Simultaneously Monitor Non-Contact/Contact Pressure

“…Capacitive flexible sensors − have a simple structure and high sensitivity under low pressure and are widely used in intelligent touch devices. Piezoresistive flexible sensors , have the characteristics of a large measurement range, long service life, easy manufacturing, and good pressure sensing ability. However, with the advent of artificial intelligence and the Internet of Things, humans need to identify and monitor more and more information.…”