Hydrogel bioelectronics

Yuk, Hyunwoo; Lu, Baoyang; Zhao, Xuanhe

doi:10.1039/c8cs00595h

Cited by 1,455 publications

(1,305 citation statements)

References 218 publications

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“…Hydrogels are a class of viscoelastic materials with 3D networks and are able to absorb and retain a large amount of water . Hydrogels are commonly composed of chemically or physically cross‐linked hydrophilic polymers.…”

Section: Summary Of the Reports About Pva/pei‐based Composition And Tmentioning

confidence: 99%

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Customization of Conductive Elastomer Based on PVA/PEI for Stretchable Sensors

Wang

Zhao

et al. 2020

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112

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Conductive, stretchable, environmentally‐friendly, and strain‐sensitive elastomers are attracting immense research interest because of their potential applications in various areas, such as human–machine interfaces, healthcare monitoring, and soft robots. Herein, a binary networked elastomer is reported based on a composite hydrogel of polyvinyl alcohol (PVA) and polyethyleneimine (PEI), which is demonstrated to be ultrastretchable, mechanically robust, biosafe, and antibacterial. The mechanical stretchability and toughness of the hydrogels are optimized by tuning the constituent ratio and water content. The optimal hydrogel (PVA2PEI1‐75) displays an impressive tensile strain as high as 500% with a corresponding tensile stress of 0.6 MPa. Furthermore, the hydrogel elastomer is utilized to fabricate piezoresistive sensors. The as‐made strain sensor displays seductive capability to monitor and distinguish multifarious human motions with high accuracy and sensitivity, like facial expressions and vocal signals. Therefore, the elastomer reported in this study holds great potential for sensing applications in the era of the Internet of Things (IoTs).

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Section: Summary Of the Reports About Pva/pei‐based Composition And Tmentioning

confidence: 99%

“…The PVA/PEI copolymer has been widely used in antibacterial materials, biosensors, drug delivery vehicles, and a binder of Li‐ion battery, as summarized in Table 1 . These studies revealed that the PVA/PEI copolymer is biocompatible and stretchable.…”

Section: Summary Of the Reports About Pva/pei‐based Composition And Tmentioning

confidence: 99%

Customization of Conductive Elastomer Based on PVA/PEI for Stretchable Sensors

Wang

Zhao

et al. 2020

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112

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“…Adhesive materials play a significant role in industrial and biomedical fields, which have been widely applied into various applications, including soft robots, [1] wound dressing, [2,3] wearable devices, [4][5][6] and 3D printing [7,8] in water or oil. Up to now, intense endeavor has been devoted to revolutionizing adhesion science and technology for developing more promising applications.…”

Section: Introductionmentioning

confidence: 99%

Tough Adhesion of Nucleobase‐Tackifed Gels in Diverse Solvents

Liu

Zhang

Duan

et al. 2019

Adv Funct Materials

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Adhesive gels have attracted increasing attention in biological medicine and industrial fields. However, it remains a huge challenge to achieve robust adhesion in various nonpolar and polar solvents. Herein, a tough nucleobasetackified adhesive gel is successfully fabricated and exhibits strong adhesion to various materials in diverse solvents, including hexane, chloroform, dimethyl sulfoxide, ethanol, and water (seawater, high salt, acid, and alkali aqueous solutions). The adhesive gels possess high toughness and excellent resist fatigue as well as impressive nonswelling behavior in water or oil. This tough gel-based adhesive holds great promise for various applications, such as battery adhesives, soft robots, wound dressing, wearable devices, and 3D printing in various environments. It is anticipated that this strategy will provide a novel route for fabricating the next generation of adhesive soft materials.

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“…Soft tactile sensors based on ionic charge injection will be not only an innovative try on the development of new sensing mechanism, but also significant to break boundaries between biological tissues and machines, because ionic charge injection is one of the currently adopted mechanisms to introduce ionic currents at tissue–electrode interfaces in bioelectronics . Here, we report an ultrasensitive ionic‐type tactile sensor with optimally designed structures, including a silver‐nanoparticles (Ag NPs)‐embedded hydrogel sandwiched by two copper electrodes.…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive, Low‐Voltage Operational, and Asymmetric Ionic Sensing Hydrogel for Multipurpose Applications

Ding

Xin

Yang

et al. 2020

Adv Funct Materials

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Current artificial tactile sensors mostly exploit a variety of electron‐related physical mechanisms to obtain high sensitivity and low detection force. However, these mechanisms are still distinct from the ion‐related biological processes of human's tactile sensation, and are therefore away from the goal of bionic applications. In the past few years, only several types of ionic tactile sensors have been proposed, and they are still subject to low sensitivity. Here, a novel type of ultrasensitive hydrogel tactile sensor is reported based on asymmetric ionic charge injection as the working mechanism, named as asymmetric ionic sensing hydrogel (AISH). With a small external working voltage of only tens of millivolts, these AISH devices show an extremely low detection force of 0.075 Pa, ultrahigh sensitivity of 57–171 kPa−1, and excellent cycling reliability upon pressing. Applications of these ultrasensitive tactile sensors in fingerprint identification of voice, monitoring of pulse waves, and detection of underwater wave signals are experimentally demonstrated. Combining the merits of simple fabrication process, ionic‐type detection mechanism, and ion injection procedure, such AISH sensors not only reveal a new strategy toward highly sensitive tactile sensors, but also show realistic potential applications in future wearable electronic and bioelectronic devices.

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Hydrogel bioelectronics

Abstract: Hydrogels have emerged as a promising bioelectronic interfacing material. This review discusses the fundamentals and recent advances in hydrogel bioelectronics.

Cited by 1,455 publications

References 218 publications

Customization of Conductive Elastomer Based on PVA/PEI for Stretchable Sensors

Customization of Conductive Elastomer Based on PVA/PEI for Stretchable Sensors

Tough Adhesion of Nucleobase‐Tackifed Gels in Diverse Solvents

Ultrasensitive, Low‐Voltage Operational, and Asymmetric Ionic Sensing Hydrogel for Multipurpose Applications

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