Interfacial Click Chemistry Enabled Strong Adhesion toward Ultra‐Durable Crack‐Based Flexible Strain Sensors

Abstract

Flexible strain sensors, particularly crack-based ones, have evoked great interests in recent years because of their excellent sensitivity and promising applications in health monitoring and human-machine interactions. However, the poor durability originated from the weak interfacial bonding between fragile conductive layer and stretchable elastic substrate makes it difficult to meet the needs of practical use. Herein, a strategy enabled by interfacial click chemistry is proposed for effectively enhancing the adhesion strength (τ), thereby improving the durability of the flexible strain sensors. It is found that the strong interfacial adhesion can bear larger cyclic shear force, effectively suppress the crack propagation of the conductive layer, and prevent the conductive layer from peeling off, thus stabilize the conductive path under specific strain during cyclic test, resulting in excellent durability. Moreover, the device durability (number of stable cycles, i.e., C n ) is found to linearly depend on τ, based on which "durability-adhesion coefficient (C DA )" is defined. So far it is known, this is the first report to quantitatively establish the relationship between interfacial adhesion strength and cycling durability of crack-based strain sensors, providing a new viewpoint for future design of flexible devices with high reliability.

Multifunctional Flexible AgNW/MXene/PDMS Composite Films for Efficient Electromagnetic Interference Shielding and Strain Sensing

“…These cracks continue to grow as the stretching process proceeds. The AgNWs effectively bridge the microcracks between MXene, prolonging the extension process of the cracks and enabling a wider sensing range and sensing sensitivity. , When the stress is released, the gap between the cracks gradually closes, and the conductive pathway increases, leading to a decrease in resistance and reversible sensing characteristic.…”

“…The AgNWs effectively bridge the microcracks between MXene, prolonging the extension process of the cracks and enabling a wider sensing range and sensing sensitivity. 57,58 When the stress is released, the gap between the cracks gradually closes, and the The relationship between different mass fractions of AgNW/ MXene and the sensing performance was investigated. Figure 4a shows that the change in the relative resistance value gradually increases with the mass fraction of AgNW/MXene under 0−40% strain conditions.…”

Ultra‐Robust and Sensitive Flexible Strain Sensor for Real‐Time and Wearable Sign Language Translation

“…Although the cyclic stability of the crack‐based strain sensors has been improved through some newly designed structures, the properties of anti‐harsh environments of the sensors have not received enough attention. [ 32–34 ]…”

Monolithically integrated flexible sensing systems with multi-dimensional printable MXene electrodes

“…, supercapacitors 4 and batteries 5,6 ) and energy-consuming devices ( e.g. , sensors 7–9 ) into an all-in-one integrated microsystem on a single substrate. In this regard, nanofiber MSC-based micro-integrated systems, wireless self-powered wearable sweat analysis systems, 10 human-breathing monitors, wearable electronics based on triboelectric nanogenerators, 11,12 thermo-phototronic solar cells, 13 and thermoelectric generators 14 have been proposed for a high-throughput, all-in-one on chip sensing platform.…”