Highly Stretchable Hydrogels as Wearable and Implantable Sensors for Recording Physiological and Brain Neural Signals

Advanced Science, Journal Year: 2022, Volume and Issue: 9(16)

Published: March 31, 2022

Recording electrophysiological information such as brain neural signals is of great importance in health monitoring and disease diagnosis. However, foreign body response performance loss over time are major challenges stemming from the chemomechanical mismatch between sensors tissues. Herein, microgels utilized large crosslinking centers hydrogel networks to modulate tradeoff modulus fatigue resistance/stretchability for producing hydrogels that closely match properties The exhibit notably different characteristics compared nanoparticles reinforced hydrogels. relatively low modulus, good stretchability, outstanding resistance. It demonstrated well suited fashioning into wearable implantable can obtain physiological pressure signals, record local field potentials rat brains, transmit through injured peripheral nerves rats. tissues, negligible response, minimal signal attenuation an extended time, successfully use long-term sensory devices. This work facilitates a deeper understanding biohybrid interfaces, while also advancing technical design concepts probes efficiently information.

Language: Английский

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Key approaches and challenges in fabricating advanced flexible zinc-ion batteries with functional hydrogel electrolytes

Energy storage materials, Journal Year: 2023, Volume and Issue: 56, P. 351 - 393

Published: Jan. 21, 2023

Language: Английский

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Self‐Healing Hydrogel Bioelectronics

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(21)

Published: Nov. 22, 2023

Abstract Hydrogels have emerged as powerful building blocks to develop various soft bioelectronics because of their tissue‐like mechanical properties, superior bio‐compatibility, the ability conduct both electrons and ions, multiple stimuli‐responsiveness. However, hydrogels are vulnerable damage, which limits usage in developing durable hydrogel‐based bioelectronics. Self‐healing aim endow with property repairing specific functions after failure, thus improving durability, reliability, longevity. This review discusses recent advances self‐healing hydrogels, from mechanisms, material chemistry, strategies for properties improvement hydrogel materials, design, fabrication, applications bioelectronics, including wearable physical biochemical sensors, supercapacitors, flexible display devices, triboelectric nanogenerators (TENGs), implantable etc. Furthermore, persisting challenges hampering development prospects proposed. is expected expedite research

Language: Английский

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Hydrogel Nanoarchitectonics of a Flexible and Self‐Adhesive Electrode for Long‐Term Wireless Electroencephalogram Recording and High‐Accuracy Sustained Attention Evaluation

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(12)

Published: Jan. 9, 2023

Hydrogels are ideal building blocks to fabricate the next generation of electrodes for acquiring high-quality physiological electrical signals, example, electroencephalography (EEG). However, collection EEG signals still suffers from electrode deformation, sweating, extensive body motion and vibration, environmental interference. Herein, polyvinyl alcohol polyvinylpyrrolidone selected prepare a hydrogel network with tissue-like modulus excellent flexibility. Additionally, polydopamine nanoparticles, obtained by peroxidation, integrated into endow them higher transparency, self-adhesion, lower impedance. Consequently, multichannel wirelessly operated can establish conformal stable interface tissue illustrate high channel uniformity, low interfacial contact impedance, power noise, long-term stability, tolerance sweat motion. Furthermore, shows unprecedented ability classify recorded prefrontal seven-category sustained attention accuracy (91.5%), having great potential applications in assessment human consciousness multifunctional diagnoses.

Language: Английский

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Water‐Resistant Conductive Gels toward Underwater Wearable Sensing

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(42)

Published: March 1, 2023

Abstract Conductive gels are developing vigorously as superior wearable sensing materials due to their intrinsic conductivity, softness, stretchability, and biocompatibility, showing a great potential in many aspects of lives. However, compared wide application on land, it is significant yet rather challenging for traditional conductive realize under water. The swelling the loss components aqueous environment, resulted from diffusion across interface, lead structural instability performance decline. Fortunately, efforts devoted improving water resistance employing them field underwater recent years, some exciting achievements obtained, which significance promoting safety efficiency activities. there no review thoroughly summarize gels. This presents brief overview representative design strategies water‐resistant diversified applications sensors. Finally, ongoing challenges further also discussed along with recommendations future.

Language: Английский

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High‐Performance Strain Sensors Based on Organohydrogel Microsphere Film for Wearable Human–Computer Interfacing

Advanced Science, Journal Year: 2022, Volume and Issue: 10(6)

Published: Dec. 23, 2022

Stretchable hydrogel-based strain sensors suffer from limited sensitivity, which urgently requires further breakthroughs for precise and stable human-computer interaction. Here, an efficient microstructural engineering strategy is proposed to significantly enhance the sensitivity of by sandwiching emulsion-polymerized polyacrylamide organohydrogel microsphere membrane between two Ecoflex films, are accompanied crack generation propagation effects upon stretching. Consequently, as-developed sensor exhibits ultrahigh (gauge factor (GF) 1275), wide detection range (100% strain), low hysteresis, ultralow limit (0.05% good fatigue resistance, fabrication cost. In addition, features water, dehydration, frost enabling real-time monitoring in various complex conditions due encapsulation film addition glycerol KCl. Through structural manipulation, device achieves superior response tiny strains, with a GF value 98.3 less than 1.5%. Owing high sensing performance, able detect human activities swallowing finger bending even under water. On this basis, wireless system apnea warning single-channel gesture recognition capabilities successfully demonstrated, demonstrating its great promise as wearable electronics.

Language: Английский

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Flexible Conformally Bioadhesive MXene Hydrogel Electronics for Machine Learning‐Facilitated Human‐Interactive Sensing

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(31)

Published: March 29, 2024

Wearable epidermic electronics assembled from conductive hydrogels are attracting various research attention for their seamless integration with human body conformally real-time health monitoring, clinical diagnostics and medical treatment, human-interactive sensing. Nevertheless, it remains a tremendous challenge to simultaneously achieve bioadhesive remarkable self-adhesiveness, reliable ultraviolet (UV) protection ability, admirable sensing performance high-fidelity epidermal electrophysiological signals along timely photothermal therapeutic performances after diagnostic sensing, as well efficient antibacterial activity hemostatic effect potential therapy. Herein, hydrogel-based sensor, featuring superior self-adhesiveness excellent UV-protection performance, is developed by dexterously assembling conducting MXene nanosheets network biological hydrogel polymer stably attaching onto skin high-quality recording of high signal-to-noise ratios (SNR) low interfacial impedance intelligent diagnosis smart human-machine interface. Moreover, sign language gesture recognition platform based on collected electromyogram (EMG) designed hassle-free communication hearing-impaired people the help advanced machine learning algorithms. Meanwhile, possesses capability, biocompatibility, effective hemostasis properties promising bacterial-infected wound bleeding.

Language: Английский

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Self-Adhesive, Anti-Freezing MXene-Based Hydrogel Strain Sensor for Motion Monitoring and Handwriting Recognition with Deep Learning

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(24), P. 29413 - 29424

Published: June 6, 2023

Flexible strain sensors based on self-adhesive, high-tensile, super-sensitive conductive hydrogels have promising application in human-computer interaction and motion monitoring. Traditional difficulty balancing mechanical strength, detection function, sensitivity, which brings challenges to their practical applications. In this work, the double network hydrogel composed of polyacrylamide (PAM) sodium alginate (SA) was prepared, MXene sucrose were used as materials reinforcing materials, respectively. Sucrose can effectively enhance performance improve ability withstand harsh conditions. The sensor has excellent tensile properties (strain >2500%), high sensitivity with a gauge factor 3.76 at 1400% strain, reliable repeatability, self-adhesion, anti-freezing ability. Highly sensitive be assembled into that distinguish between various strong or subtle movements human body, such joint flexion throat vibration. addition, applied handwriting recognition English letters by using fully convolutional (FCN) algorithm achieved accuracy 98.1% for recognition. as-prepared broad prospect human-machine interaction, provides great potential flexible wearable devices.

Language: Английский

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Porous Conductive Textiles for Wearable Electronics

Chemical Reviews, Journal Year: 2024, Volume and Issue: 124(4), P. 1535 - 1648

Published: Feb. 19, 2024

Over the years, researchers have made significant strides in development of novel flexible/stretchable and conductive materials, enabling creation cutting-edge electronic devices for wearable applications. Among these, porous textiles (PCTs) emerged as an ideal material platform electronics, owing to their light weight, flexibility, permeability, wearing comfort. This Review aims present a comprehensive overview progress state art utilizing PCTs design fabrication wide variety integrated systems. To begin with, we elucidate how revolutionize form factors electronics. We then discuss preparation strategies PCTs, terms raw processes, key properties. Afterward, provide detailed illustrations are used basic building blocks fabricate intrinsically flexible or stretchable devices, including sensors, actuators, therapeutic energy-harvesting storage displays. further describe techniques systems either by hybridizing conventional off-the-shelf rigid components with integrating multiple fibrous PCTs. Subsequently, highlight some important application scenarios healthcare, sports training, converging technologies, professional specialists. At end Review, challenges perspectives on future research directions give overall conclusions. As demand more personalized interconnected continues grow, PCT-based wearables hold immense potential redefine landscape technology reshape way live, work, play.

Language: Английский

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Intrinsically Electron Conductive, Antibacterial, and Anti‐swelling Hydrogels as Implantable Sensors for Bioelectronics

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(48)

Published: Sept. 22, 2022

Abstract New materials and devices for bioelectronics have emerging applications in healthcare monitoring disease diagnostics. Hydrogel‐based sensors face great challenges achieving desirable synergistic performances including intrinsical electron conduction, bacterial resistance, anti‐swelling property, adhesion to tissues. To address current bottlenecks, poly(Cu‐arylacetylide) derived hydrogels are developed the first time that demonstrates all these above intriguing as a result of special Cu‐arylacetylide backbone. The show capability recording electrocardiogram (ECG), electromyogram, implantable epicardial ECG, transmitting neural signals. Furthermore, Cu (I) polymer chains can be substituted by other metal ions such Au (I), which create numerous new with performances. This study not only creates research field but advances design concepts electrodes record bio‐electron.

Language: Английский

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