A fast self-healing and conductive nanocomposite hydrogel as soft strain sensor

Wang, Man; Chen, Yujie; Khan, Rajwali; Liu, Hezhou; Chen, Chi; Chen, Tao; Zhang, Runjing; Li, Hua

doi:10.1016/j.colsurfa.2019.01.034

Cited by 94 publications

(46 citation statements)

References 68 publications

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“…Hydrogels which consist of 3D networks with large quantity of water or ionic liquid have been proposed as electrode materials for soft electronics, due to their large stretchability, self‐healability, and biocompatibility . For sensing applications, hydrogel‐based resistive strain sensors have been widely studied . These devices have achieved large sensing limits, but the hydrogels have relatively long self‐healing time and low self‐healing efficiency .…”

Section: Introductionmentioning

confidence: 99%

Highly Stretchable and Self‐Healable MXene/Polyvinyl Alcohol Hydrogel Electrode for Wearable Capacitive Electronic Skin

Zhang

Wan

Gao

et al. 2019

Adv Elect Materials

314

226

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body motion monitoring, covering subtle and large-strain ranges.Capacitive strain sensor has a simple structure with two electrodes separated by a dielectric material. Metals [19] and semiconductors [20] can be used as electrodes for constructing capacitive sensors. However, these electrode materials have poor mechanical properties, limiting the sensing range of capacitive strain sensors. [21] To solve the problem, geometrical engineering of rigid materials into buckled, [22][23][24] wrinkled, [16,25] and kirigami [26] forms is widely employed. For example, Someya's group shaped gold film into a wrinkled form for developing capacitive strain sensors, with a stretchability up to 140%. [16] In addition to the geometrical engineering, the usage of intrinsic stretchable materials as electrode for soft capacitive strain sensors is the other strategy widely adopted. These intrinsic stretchable materials include liquid metal, [27] nanomaterial/elastomer composites, [28] and conductive textiles. [29] Dickey and co-workers developed a liquid-metal-based capacitive strain sensor having a high stretchability (≈100%). [8] A capacitive strain sensor using conductive textile electrode was developed by Walsh's group, with a stretchability of 100% and a sensitivity of 1.23. [29] Cohen et al. reported a carbon nanotube (CNT)/elastomer-based capacitive sensor, owning a stretchability of 100% and a sensitivity of 0.99. [7] Although the above strategies can provide capacitive sensors with high stretchability, most of the electrode materials are not intrinsically self-healable. To fully mimic the functionality of human skin, the self-healability for sensory devices is highly demanded. [30] Hydrogels which consist of 3D networks with large quantity of water or ionic liquid have been proposed as electrode materials for soft electronics, due to their large stretchability, self-healability, and biocompatibility. [31,32] For sensing applications, hydrogel-based resistive strain sensors have been widely studied. [33][34][35][36] These devices have achieved large sensing limits, but the hydrogels have relatively long self-healing time and low self-healing efficiency. [33,36,37] Additionally, some of them needs external heating to accelerate the self-healing process. [35,38] Through the dynamic complexing interaction between metal ion and OH group, polyvinyl alcohol (PVA) based hydrogel has been investigated as active materials for constructing sensors. [39,40] CNT/PVA-based resistive strain Capacitive strain sensors could become an important component of electronic skin (E-skin) due to their low hysteresis and high linearity. However, to fully mimic the functionality of human skin, a capacitive strain sensor should be stretchable and self-healable. The development of such a sensor is limited by electrode materials which generally lack self-healability and/or stretchability. A highly stretchable and self-healing MXene (Ti 3 C 2 T x )/polyvinyl alcohol (PVA) hydrogel electrode is developed for use in capacitive strain sensors for E-skin. The...

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Section: Introductionmentioning

confidence: 99%

Highly Stretchable and Self‐Healable MXene/Polyvinyl Alcohol Hydrogel Electrode for Wearable Capacitive Electronic Skin

Zhang

Wan

Gao

et al. 2019

Adv Elect Materials

314

226

View full text Add to dashboard Cite

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“…As shown in Figure 5, the relative resistance change of the conductive hydrogel gradually increased when the hydrogel was stretched. This can be explained by the stretching of the conductive hydrogel, which narrowed the porous microstructure, and damaged the 3D network framework of GO for electron transport, giving rise to the growth of resistance [40].…”

Section: Resultsmentioning

confidence: 99%

Smart Composite Hydrogels with pH-Responsiveness and Electrical Conductivity for Flexible Sensors and Logic Gates

et al. 2019

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Stimuli-responsive conductive hydrogels have a wide range of applications due to their intelligent sensing of external environmental changes, which are important for smart switches, soft robotics, and flexible sensors. However, designing stimuli-responsive conductive hydrogels with logical operation, such as smart switches, remains a challenge. In this study, we synthesized pH-responsive conductive hydrogels, based on the copolymer network of acrylic acid and hydroxyethyl acrylate doped with graphene oxide. Using the good flexibility and conductivity of these hydrogels, we prepared a flexible sensor that can realize the intelligent analysis of human body motion signals. Moreover, the pH-responsive conductive hydrogels were integrated with temperature-responsive conductive hydrogels to develop logic gates with sensing, analysis, and driving functions, which realized the intellectualization of conductive hydrogels.

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“…On the other hand, the rest combines different physical non-covalent interactions, such as combining hydrogen bonds with ionic interaction ( Long et al, 2018 ; Jiang X. et al, 2019 ; Li S. et al, 2019 ; Lin et al, 2019 ; Song D. et al, 2019 ; Yuan et al, 2019 ; Zhang et al, 2019 ), with π-π stacking ( Liao et al, 2017 ; Gavel et al, 2018 ; Liang et al, 2019 ; Xu J. et al, 2019 ), and others ( Chen et al, 2019b ; Qiao et al, 2019 ), combining ionic interaction with hydrophobic interaction ( Chen et al, 2019b ), or combining multiple non-covalent interactions ( Wang S. et al, 2018 ; Deng et al, 2019 ). Additionally, some belong to both categories, such as using both boronate-diol complexation and hydrogen bonds ( Ding et al, 2018 ; Peng et al, 2019 ; Shao et al, 2019 ; Wang M. et al, 2019 ), both imine bond and hydrogen bonds ( Liu et al, 2018 ; Cheng et al, 2019 ), both host-guest interaction and boronate-diol complexation ( Yang et al, 2019 ), both metal-ligand coordination and hydrophobic interaction ( Tang et al, 2018 ), both dipole-dipole association and boronate-diol complexation ( Chen Y. et al, 2018 ), and multiple ones ( Jing et al, 2018 ; Qu et al, 2018 ; Pan et al, 2019 ; Xu H. et al, 2019 ).…”

Section: Mechanism Of Intrinsic Type Self-healing Hydrogelsmentioning

confidence: 99%

“…Thanks to their ability to recover their structure after damage, self-healing hydrogels are competitive candidates for pharmaceutical, biomedical, and other applications. Self-healing capability in natural tissues is a fascinating property, which can extend life span and enhance reliability and durability ( Wang M. et al, 2019 ). Some self-healing hydrogels also have other properties, such as conductivity, strong adhesion, and stimuli-responsiveness, enabling them to be used in more specific fields.…”

Section: Applications Of Self-healing Hydrogelsmentioning

confidence: 99%

Advances in Synthesis and Applications of Self-Healing Hydrogels

Fan

Qian

et al. 2020

Front. Bioeng. Biotechnol.

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Background: Hydrogels, a type of three-dimensional (3-D) crosslinked network of polymers containing a high water concentration, have been receiving increasing attention in recent years. Self-healing hydrogels, which can return to their original structure and function after physical damage, are especially attractive. Some selfhealable hydrogels have several kinds of properties such as injectability, adhesiveness, and conductivity, which enable them to be used in the manufacturing of drug/cell delivery vehicles, glues, electronic devices, and so on. Main Body: This review will focus on the synthesis and applications of self-healing hydrogels. Their repair mechanisms and potential applications in pharmaceutical, biomedical, and other areas will be introduced. Conclusion: Self-healing hydrogels are used in various fields because of their ability to recover. The prospect of self-healing hydrogels is promising, and they may be further developed for various applications.

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A fast self-healing and conductive nanocomposite hydrogel as soft strain sensor

Cited by 94 publications

References 68 publications

Highly Stretchable and Self‐Healable MXene/Polyvinyl Alcohol Hydrogel Electrode for Wearable Capacitive Electronic Skin

Highly Stretchable and Self‐Healable MXene/Polyvinyl Alcohol Hydrogel Electrode for Wearable Capacitive Electronic Skin

Smart Composite Hydrogels with pH-Responsiveness and Electrical Conductivity for Flexible Sensors and Logic Gates

Advances in Synthesis and Applications of Self-Healing Hydrogels

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