Tough and Conductive Dual Physically Cross-Linked Hydrogels for Wearable Sensors

Yang, Jia; Yu, Li; Yu, Xianqiang; Sun, Xiangbin; Zhu, Lin; Qin, G.; Dai, Yahui; Chen, Qiang

doi:10.1021/acs.iecr.9b01796

Cited by 26 publications

(20 citation statements)

References 61 publications

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“…In addition, the hydrogel was rich in sodium and chloride ions and had high ionic conductivity. This ion conductive hydrogel with salts is believed to be an ideal material for the fabrication of strain sensors [230][231][232][233].…”

Section: Ionic Self-healing Hydrogelmentioning

confidence: 99%

Self-Healing Mechanism and Conductivity of the Hydrogel Flexible Sensors: A Review

Zhang

Wang

Wei

et al. 2021

Gels

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Sensors are devices that can capture changes in environmental parameters and convert them into electrical signals to output, which are widely used in all aspects of life. Flexible sensors, sensors made of flexible materials, not only overcome the limitations of the environment on detection devices but also expand the application of sensors in human health and biomedicine. Conductivity and flexibility are the most important parameters for flexible sensors, and hydrogels are currently considered to be an ideal matrix material due to their excellent flexibility and biocompatibility. In particular, compared with flexible sensors based on elastomers with a high modulus, the hydrogel sensor has better stretchability and can be tightly attached to the surface of objects. However, for hydrogel sensors, a poor mechanical lifetime is always an issue. To address this challenge, a self-healing hydrogel has been proposed. Currently, a large number of studies on the self-healing property have been performed, and numerous exciting results have been obtained, but there are few detailed reviews focusing on the self-healing mechanism and conductivity of hydrogel flexible sensors. This paper presents an overview of self-healing hydrogel flexible sensors, focusing on their self-healing mechanism and conductivity. Moreover, the advantages and disadvantages of different types of sensors have been summarized and discussed. Finally, the key issues and challenges for self-healing flexible sensors are also identified and discussed along with recommendations for the future.

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Section: Ionic Self-healing Hydrogelmentioning

confidence: 99%

Self-Healing Mechanism and Conductivity of the Hydrogel Flexible Sensors: A Review

Zhang

Wang

Wei

et al. 2021

Gels

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show abstract

“…Yang et al developed poly(N-hydroxymethyl acrylamide) hydrophobic association hydrogels (PHMA HA gels) using free radical micellar polymerization of HMA and stearyl methacrylate (C 18 ) under the action of sodium dodecyl sulfate (SDS)/NaCl. 109 Then, a simple circuit comprising lightemitting diodes and a sheet of PHMA HA gel was used to study the change in luminance with tensile strength. These results indicate that hydrogels can serve as strain and pressure sensors.…”

Section: ■ Introductionmentioning

confidence: 99%

Conductive Hydrogels—A Novel Material: Recent Advances and Future Perspectives

Liu

Wei

Song

et al. 2020

J. Agric. Food Chem.

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A conductive hydrogel is a kind of polymer material having substantial potential applications with various properties, including high toughness, self-recoverability, electrical conductivity, transparency, freezing resistance, stimuli responsiveness, stretchability, self-healing, and strain sensitivity. Herein, according to the current research status of conductive hydrogels, properties of conductive hydrogels, preparation methods of different conductive hydrogels, and their application in different fields, such as sensor and actuator fabrication, biomedicine, and soft electronics, are introduced. Furthermore, the development direction and application prospects of conductive hydrogels are proposed.

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“…Flexible electronic devices have attracted great attention worldwide because of their deformability and strong adaptability of various working conditions. − The touch display panel is one of the most convenient human–computer interaction modes, and its market has been dominated by capacitive touchscreen panel (CTP). As a result, the flexible CTPs have aroused widespread interest.…”

Section: Introductionmentioning

confidence: 99%

Self-Healable and Remoldable Transparent Polyurethane Film with High Dielectric Constant from the Synergistic Effect between Lithium Salt and Ionic Liquid

Yuan

Liang

et al. 2020

Ind. Eng. Chem. Res.

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The rapid development of new-generation flexible touch display panels puts forward more requirements on the overlays, not only including colorlessness and transparency but also having self-healing and remolding abilities as well as high dielectric constant. Herein, new self-healable and remoldable polyurethane films (PULEx) with high dielectric constant have been developed through building of reversible cross-linked networks with special synergistic effect between lithium salt and ionic liquid. The integrated performance of PULEx was systematically investigated. Results show that as the loadings of lithium salt and ionic salt increase, films show increased dielectric constant and self-healing ability. The film with suitable composition (PULE7.5) has the best comprehensive performance; its dielectric constants (104–106 Hz) range from 9.6 to 6.1, which are comparable to those of glass (commonly used overlay for rigid capacitive touchscreen panels). The construction of reversible covalent cross-linking endows PULE7.5 with good mechanical strength, high self-healing efficiency after complete fracture (92.7%), and high recovery of mechanical properties after remolding (91.8%). In addition, the colorless PULE7.5 has high transparency (90.7% transmittance at 550 nm) and can freely convert among three shapes of bending, scrolling, and S-shape, showing great prospects in fabricating flexible display devices. The mechanism behind these outstanding integrated performances of PULE films is investigated through correlation with structures.

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Tough and Conductive Dual Physically Cross-Linked Hydrogels for Wearable Sensors

Cited by 26 publications

References 61 publications

Self-Healing Mechanism and Conductivity of the Hydrogel Flexible Sensors: A Review

Self-Healing Mechanism and Conductivity of the Hydrogel Flexible Sensors: A Review

Conductive Hydrogels—A Novel Material: Recent Advances and Future Perspectives

Self-Healable and Remoldable Transparent Polyurethane Film with High Dielectric Constant from the Synergistic Effect between Lithium Salt and Ionic Liquid

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