A self-adhesive wearable strain sensor based on a highly stretchable, tough, self-healing and ultra-sensitive ionic hydrogel

Yin, Jianyu; Pan, Shenxin; Wu, Lili; Tan, Liyina; Chen, Di; Huang, Shan; Zhang, Yuhong; He, Peixin

doi:10.1039/d0tc04144k

Cited by 115 publications

(68 citation statements)

References 56 publications

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“…It can be seen from the data that the adhesion strength of hydrogels weakened slightly, which was due to the decrease in water on the surface of hydrogels and the influence of dust on the interface of materials. Compared with the literature, , after 10 cyclic adhesion, the decrease in adhesion strength of DCMC/AG/PAA hydrogels was lower, indicating that the DCMC/AG/PAA hydrogels had more stable repeated adhesion performance. These results show that the adhesion properties of the DCMC/AG/PAA hydrogel make it much more suitable for use as a sensor in human health monitoring, especially for plantar pressure detection for flatfoot patients.…”

Section: Resultscontrasting

confidence: 64%

“…As shown in Figure c, the adhesion strength of DCMC/AG/PAA hydrogels on glass, wood, rubber, metal, nitrile gloves, and skin is 7.5, 12.8, 4.2, 4.6, 11.1, and 17.5 kPa, respectively. The data are similar to the adhesion strength of polyacrylic acid hydrogels reported in the literature, ,, indicating that DCMC/AG/PAA hydrogels have good adhesion to the substrates. The adhesion mechanism between the hydrogel and glass can be explained by the formation of surface tension between water in the hydrogel and glass .…”

Section: Resultsmentioning

confidence: 99%

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Tough, Repeatedly Adhesive, Cyclic Compression-Stable, and Conductive Dual-Network Hydrogel Sensors for Human Health Monitoring

Ling

Tao

Liu

et al. 2021

Ind. Eng. Chem. Res.

112

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Hydrogel-based flexible wearable devices have attracted wide attention from researchers due to their great potential application in human–computer interaction, electronic skin, and disease diagnosis. However, the preparation of conductive hydrogels integrating good biocompatibility, excellent mechanical (tensile and compressible) properties, self-adhesive properties, cyclic stretching, and compression stability remains a challenge. By the Schiff base reaction between dialdehyde carboxymethyl cellulose and amino gelatin to form the first layer of the network and by the free-radical polymerization of acrylic acid to form the second layer of the network, a multifunctional conductive dual-network (DN) hydrogel strain sensor was prepared. The composite DN hydrogel has excellent compression properties (the strength reached to 0.12 MPa when the hydrogel was compressed to 50% of its original height), good cyclic compression (≥10 000 times), repeatable adhesion (≥10 times), reliable electrical conductivity, and high sensitivity (gauge factor = 8.1). The biocompatible hydrogel can be used not only to monitor human body movement but also to detect the breathing movement of simulated pig lungs in vitro. Furthermore, the conductive hydrogel was creatively made into a plantar pressure sensor similar to an insole to monitor the stress on the sole of a flatfoot patient, providing a new potential material for flatfoot detection and correction.

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Section: Resultscontrasting

confidence: 64%

Section: Resultsmentioning

confidence: 99%

Tough, Repeatedly Adhesive, Cyclic Compression-Stable, and Conductive Dual-Network Hydrogel Sensors for Human Health Monitoring

Ling

Tao

Liu

et al. 2021

Ind. Eng. Chem. Res.

112

View full text Add to dashboard Cite

show abstract

“…It is worth mentioning that the Young's modulus ( E ) of the DN hydrogels are relative low (67.8–101.1 kPa), comparing to that of human skin (0.4–0.8 MPa). The low modulus is beneficial for the hydrogel‐based flexible sensor to form conformal contact with the skin, which is essential for the sensitivity and stability of signal detection 37 …”

Section: Resultsmentioning

confidence: 99%

Polyacrylamide/carboxymethyl chitosan double‐network hydrogels with high conductivity and mechanical toughness for flexible sensors

Zeng

et al. 2021

J of Applied Polymer Sci

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Conductive hydrogels are ideal candidate materials for flexible sensors, but the integration of satisfactory mechanical performances with high conductivity to meet the requirements for practical applications remains a challenge. Herein, a tough ionically conductive polyacrylamide (PAAm)/carboxymethyl chitosan (CMCs) double‐network (DN) hydrogel is fabricated via in situ polymerization of acrylamide in CMCs aqueous solution, followed by ferric chloride (FeCl3) solution immersing. The PAAm/CMCs‐Fe3+ DN hydrogel demonstrates satisfactory mechanical properties, including sufficient tensile strength (~440 kPa), prominent stretchability (~715%), high toughness (~1658 kJ m−3), and excellent fatigue resistance, as well as superb conductivity up to 3.1 S m−1. Moreover, the ionically conductive DN hydrogel‐based sensors exhibit high sensitivity in a broad strain window (0%–700%) and can accurately, and repeatedly monitor the motions of body joints, such as finger and wrist, exhibiting great potential in applications of flexible sensors.

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“…[120] For example, because dopamine and Fe(III) can easily form new coordination bonds, researchers mixed dopamine and amine-functionalized polymers to prepare a self-repairing hydrogel (Figure 5e). [121][122][123] Specifically, the strength of the coordination bonds between dopamine and Fe(III) depended on the pH level. When the pH level increased from acidic to alkaline, the hydrogel healed quickly.…”

Section: Polymer Matrices For Supercapacitive Interfacial Ionic Flexi...mentioning

confidence: 99%

Ionic Flexible Sensors: Mechanisms, Materials, Structures, and Applications

Zhao

Wang

Tang

et al. 2022

Adv Funct Materials

133

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Over the past few decades, flexible sensors have been developed from the "electronic" level to the "iontronic" level, and gradually to the "ionic" level. Ionic flexible sensors (IFS) are one kind of advanced sensors that are based on the concept of ion migration. Compared to conventional electronic sensors, IFS can not only replicate the topological structures of human skin, but also are capable of achieving tactile perception functions similar to that of human skin, which provide effective tools and methods for narrowing the gap between conventional electronics and biological interfaces. In this review, the latest research and developments on several typical sensing mechanisms, compositions, structural design, and applications of IFS are comprehensively reviewed. Particularly, the development of novel ionic materials, structural designs, and biomimetic approaches has resulted in the development of a wide range of novel and exciting IFS, which can effectively sense pressure, strain, and humidity with high sensitivity and reliability, and exhibit self-powered, self-healing, biodegradability, and other properties of the human skin. Furthermore, the typical applications of IFS in artificial skin, human-interactive technologies, wearable health monitors, and other related fields are reviewed. Finally, the perspectives on the current challenges and future directions of IFS are presented.

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A self-adhesive wearable strain sensor based on a highly stretchable, tough, self-healing and ultra-sensitive ionic hydrogel

Abstract: Flexible and conductive hydrogel sensors have great potential for applications in wearable and implantable devices, electronic skin and healthcare diagnosis. However, it remains a great challenge to develop an integrated...

Cited by 115 publications

References 56 publications

Tough, Repeatedly Adhesive, Cyclic Compression-Stable, and Conductive Dual-Network Hydrogel Sensors for Human Health Monitoring

Tough, Repeatedly Adhesive, Cyclic Compression-Stable, and Conductive Dual-Network Hydrogel Sensors for Human Health Monitoring

Polyacrylamide/carboxymethyl chitosan double‐network hydrogels with high conductivity and mechanical toughness for flexible sensors

Ionic Flexible Sensors: Mechanisms, Materials, Structures, and Applications

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