Self-healing flexible strain sensors based on dynamically cross-linked conductive nanocomposites

Dai, Xingyi; Huang, Long‐Biao; Du, Yuzhang; Han, Jiancheng; Kong, Jie

doi:10.1016/j.coco.2021.100654

Cited by 40 publications

(28 citation statements)

References 34 publications

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“…Based on the piezoresistive effect, this device could detect various deformations such as stretching, bending, and torsion. [ 18 ] Gong et al reported a conductive filler composed of conductive carbon nanostructures and plantain, and obtained a strain sensor by infiltrating it in polydimethylsiloxane with a sensitivity of 4.5 (0–20% linear strain). [ 19 ] Although the piezoresistive strain sensor with high stretchability and sensitivity could be directly achieved by infilling conductive nanomaterials into elastomers, highly efficient and scalable fabrication method is still needed for the wide application of the devices.…”

Section: Introductionmentioning

confidence: 99%

3D Printed Reduced Graphene Oxide/Elastomer Resin Composite with Structural Modulated Sensitivity for Flexible Strain Sensor

et al. 2021

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High-performance flexible strain sensors with cost-effective and scalable fabrication methods are highly demanded for human-machine interfaces, soft robotics, and health monitoring. Herein, a digital light processing-based 3D printing method, which manufactures structures in a scalable and efficient layerby-layer manner, is developed to prepare a type of flexible strain sensors consisting of reduced graphene oxide/elastomer resin (RGO/ER) composite as the strain sensing element and RGO/ER composite with rhombic structure as the electrode. The RGO/ER composite as the sensing element has a sensitivity of 6.723 at a linear strain detection range from 0.01% to 40% and a high mechanical stability of more than 10 000 stretching-relaxing cycles. Furthermore, through the structural modulation, the sensitivity of the composite responding to mechanical deformation is modulated and suppressed, which can be used as the electrode for the strain sensor. The all-3D printed device with structurally modulated performance can be used for monitoring various human motions.

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Section: Introductionmentioning

confidence: 99%

3D Printed Reduced Graphene Oxide/Elastomer Resin Composite with Structural Modulated Sensitivity for Flexible Strain Sensor

et al. 2021

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“…The electrical healing efficiency of ICFE-1.5M reaches up to 99% within 4 s, revealing its rapid electrical recovery capability. [34] Dynamic rheological measurements were performed to evaluate the self-healability of the ICFE. The G′ and G″ of ICFE-1.5M were determined by strain sweep measurements.…”

Section: Resultsmentioning

confidence: 99%

“…The electrical healing efficiency of ICFE‐1.5M reaches up to 99% within 4 s, revealing its rapid electrical recovery capability. [ 34 ]…”

Section: Resultsmentioning

confidence: 99%

A Waterproof Ion‐Conducting Fluorinated Elastomer with 6000% Stretchability, Superior Ionic Conductivity, and Harsh Environment Tolerance

Shi

Wang

Wan

et al. 2022

Adv Funct Materials

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The development of ionic conductors with extreme stretchability, superior ionic conductivity, and harsh‐environment resistance is urgent while challenging because the tailoring of these performances is mutually exclusive. Herein, a hydrophobicity‐constrained association strategy is presented for fabricating a liquid‐free ion‐conducting fluorinated elastomer (ICFE) with microphase‐separated structures. Hydrophilic nanodomains with long‐range ordering and selectively enriched Li ions provided high‐efficient conductive pathways, yielding impressive room‐temperature ionic conductivity of 3.5 × 10–3 S m–1. Hydrophobic nanodomains with abundant and reversible hydrogen bonds endow the ICFE with superior damage‐tolerant performances including ultrastretchability (>6000%), large toughness (17.1 MJ m–3) with notch insensitivity, antifatigue ability, and high‐efficiency self‐healability. Due to its liquid‐free characteristic and surface‐enriched hydrophobic nanodomains, the ICFE demonstrates an extreme temperature tolerance (−20 to 300 °C) and unique underwater resistance. The resultant ICFE is assembled into a proof‐of‐concept skin‐inspired sensor, showing impressive capacitive sensing performance with high sensitivity and wide‐strain‐range linearity (gauge factor to 1.0 in a strain range of 0–350%), excellent durability (>1000 cycles), and unique waterproofness in monitoring of complex human motions. It is believed that the hydrophobicity‐constrained association method boosts the fabrication of stretchable ionic conductors holding a great promise in skin‐inspired ionotronics with harsh‐environment tolerance.

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“…As the polyurethane crack. 50,51 Whereafter, when the films cooling, the hydrogen bonds will reconnect and the new cross-linking network will form, causing the crack to self-healed and the mechanical properties of films restored. 52 The self-healing efficiencies of the SWPU-T x samples were further quantitatively evaluated via tensile tests.…”

Section: Self-healing Properties Of Swpu-t X Filmsmentioning

confidence: 99%

Synthesis of self‐healing supramolecular waterborne polyurethane with quadruple hydrogen bonds via ureidotriazine

Líu

Dong-cheng

2021

J of Applied Polymer Sci

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A supramolecular waterborne polyurethane (SWPU) with excellent mechanical and self‐healing properties simultaneously is reported in this work. Herein, the SWPU were synthesized by using 2,4‐diamino‐6‐undecyl‐1,3,5‐triazine react with isophorone diisocyanate to introduce ureidotriazine (UTr) structures into the main chain of polyurethane that can self‐assemble to form quadruple hydrogen bonds systems. A higher dimerization constant obtained through introducing two intramolecular hexatomic ring hydrogen bonds into the UTr structure, and the hydrophobicity, plasticity brought by the undecyl group on the triazine ring are beneficial to make a great balance between the binding strength for mechanical performance and the chain reversibility, mobility for self‐healing. Owing to the accuracy design, the SWPU exhibits high tensile stress (33.85 MPa) and excellent self‐healing ability (90.52%), which shows an enormous application potential in the field of functional coatings and adhesives.

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Self-healing flexible strain sensors based on dynamically cross-linked conductive nanocomposites

Cited by 40 publications

References 34 publications

3D Printed Reduced Graphene Oxide/Elastomer Resin Composite with Structural Modulated Sensitivity for Flexible Strain Sensor

3D Printed Reduced Graphene Oxide/Elastomer Resin Composite with Structural Modulated Sensitivity for Flexible Strain Sensor

A Waterproof Ion‐Conducting Fluorinated Elastomer with 6000% Stretchability, Superior Ionic Conductivity, and Harsh Environment Tolerance

Synthesis of self‐healing supramolecular waterborne polyurethane with quadruple hydrogen bonds via ureidotriazine

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