In Situ Forming Dual‐Conductive Hydrogels Enable Conformal, Self‐Adhesive and Antibacterial Epidermal Electrodes

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(38)

Published: May 26, 2023

Abstract Conductive hydrogels (CHs) are regarded as one of the most promising materials for bioelectronic devices on human‐machine interfaces (HMIs). However, conventional CHs cannot conform well with complex skin surfaces, such hairy or wrinkled skin, due to pre‐formation and insufficient adhesion; they also usually lack antibacterial abilities require tissue‐harm time‐consuming preparation (e.g., heating ultraviolet irradiation), which limits their practical application HMIs. Herein, an in situ forming CH is proposed by taking advantage PEDOT:PSS‐promoted self‐polymerization zwitterionic [2‐(methacryloyloxy)ethyl]dimethyl‐(3‐sulfopropyl) (SBMA). The hydrogel formed spontaneously after injection precursor solution onto desired location without any additional treatments. as‐prepared possesses excellent elasticity (elastic recovery >96%), desirable adhesive strength (≈6.5 kPa), biocompatibility, intrinsically properties. Without apparent heat release (<5 °C) during gelation, can form skin. Additionally, obtained establish tight contact highly conformal surfaces irregular wounds. Finally, applied epidermal electrodes record stable reliable surface electromyogram signals from (with high signal‐to‐noise ratio, SNR ≈ 32 dB) accelerate diabetic wound healing under electrical stimulation.

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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A Breathable, Stretchable, and Self‐Calibrated Multimodal Electronic Skin Based on Hydrogel Microstructures for Wireless Wearables

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(32)

Published: April 12, 2024

Abstract Biomimetic electronic skins (e‐skins) are widely used in wearables, smart prosthesis and soft robotics. However, multimodal e‐skins, especially those based on hydrogels, face multiple challenges for practical applications, involving multi‐sensing signal mutual interference, low breathability stretchability. Here, a breathable stretchable e‐skin with multilayer film microstructure is developed to achieve self‐calibrated sensing of any two three stimuli: strain, temperature, humidity, minimal crosstalk. Hydrogel fibers different shapes designed strain temperature modules, the hydrogel as humidity module. The exhibits impressive performance, including detection limit (0.03%), linearity (R 2 = 0.990), high‐temperature sensitivity (1.77%/°C), wide range (33–98% RH). Interestingly, due directional anisotropy shaped fibers, realizes directions. By introducing porous elastomer encapsulation membranes, wearing comfort attained, while high stretchability (100% strain) maintained. Furthermore, personalized human‐machine interaction system created by integrating wireless circuit realize real‐time gesture recognition, physiological signals monitoring, prosthesis.

Language: Английский

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NH3-Induced In Situ Etching Strategy Derived 3D-Interconnected Porous MXene/Carbon Dots Films for High Performance Flexible Supercapacitors

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: Oct. 18, 2023

2D MXene (Ti3CNTx) has been considered as the most promising electrode material for flexible supercapacitors owing to its metallic conductivity, ultra-high capacitance, and excellent flexibility. However, it suffers from a severe restacking problem during fabrication process, limiting ion transport kinetics accessibility of ions in electrodes, especially direction normal surface. Herein, we report NH3-induced situ etching strategy fabricate 3D-interconnected porous MXene/carbon dots (p-MC) films high-performance supercapacitor. The pre-intercalated carbon (CDs) first prevent expose more inner electrochemical active sites. partially decomposed CDs generate NH3 nanosheets toward p-MC films. Benefiting structural merits ionic transmission channels, film electrodes achieve gravimetric capacitance (688.9 F g-1 at 2 A g-1) superior rate capability. Moreover, optimized is assembled into an asymmetric solid-state supercapacitor with high energy density cycling stability, demonstrating great promise practical applications.

Language: Английский

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Bioinspired Multifunctional Self-Sensing Actuated Gradient Hydrogel for Soft-Hard Robot Remote Interaction

Nano-Micro Letters, Journal Year: 2024, Volume and Issue: 16(1)

Published: Jan. 4, 2024

Abstract The development of bioinspired gradient hydrogels with self-sensing actuated capabilities for remote interaction soft-hard robots remains a challenging endeavor. Here, we propose novel multifunctional hydrogel that combines ultrafast actuation and high sensitivity robotic hand. network structure, achieved through wettability difference method involving the rapid precipitation MoO 2 nanosheets, introduces hydrophilic disparities between two sides within hydrogel. This distinctive approach bestows thermo-responsive (21° s −1 ) enhanced photothermal efficiency (increase by 3.7 °C under 808 nm near-infrared). Moreover, local cross-linking sodium alginate Ca 2+ endows programmable deformability information display capabilities. Additionally, exhibits (gauge factor 3.94 wide strain range 600%), fast response times (140 ms) good cycling stability. Leveraging these exceptional properties, incorporate into various soft actuators, including gripper, artificial iris, jellyfish, as well wearable electronics capable precise human motion physiological signal detection. Furthermore, synergistic combination remarkable sensitivity, realize touch tongue. Notably, employing quantitative analysis actuation-sensing, robot via Internet Things. presented in this study provides new insight advanced somatosensory materials, self-feedback intelligent human–machine interactions.

Language: Английский

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Mxene hybrid conductive hydrogels with mechanical flexibility, frost-resistance, photothermoelectric conversion characteristics and their multiple applications in sensing

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 483, P. 149299 - 149299

Published: Feb. 3, 2024

Language: Английский

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Highly Stretchable, Low‐Hysteresis, and Adhesive TA@MXene‐Composited Organohydrogels for Durable Wearable Sensors

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(30)

Published: March 25, 2024

Abstract As wearable sensors advance rapidly, demands for multifunctional conductive soft materials are ever higher, including high stretchability, resilience, adhesiveness and stability, simultaneously in one material, stable long‐term use. Nanocomposite hydrogels incorporating two‐dimensional (2D) nanofillers, such as MXene‐composited gels, emerge promising candidates. Yet, fulfilling all above requirements, particularly large stretchability with low hysteresis, remains a challenge, owing to the easy oxidation weak interactions of MXene nanosheets polymer chains. Herein, an interfacial engineering strategy is proposed, where tannic acid (TA) high‐density hydroxyl groups introduced encapsulate into TA@MXene nano‐motif meanwhile increase hydrogen‐bonding between network. By poly(hydroxyethyl acrylate) (PHEA) network glycerol/water binary solvent, obtained organohydrogel exhibits integrated properties (>500%) hysteresis (<3%), superior fatigue resistance (consistent over 500 cycles at 300% strain), good adhesiveness, along stability (>7 days) antifreezing abilities (−40 °C). Such organohydrogels demonstrate strain‐sensitivity thermosensitive capacities, enabling accurate reliable detection human movements, electrocardiogram signals, body temperature. This general approach stabilizing nanomaterials while effectively enhancing nanomaterial‐polymer bonding applicable synthesizing diverse high‐performance nanocomposited gels.

Language: Английский

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A Skin‐Bioinspired Urchin‐Like Microstructure‐Contained Photothermal‐Therapy Flexible Electronics for Ultrasensitive Human‐Interactive Sensing

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(40)

Published: Aug. 24, 2023

Abstract Wearable electronic sensors have attracted extensive attention in multifunctional skin, personalized health monitoring, intelligent human–machine interaction, and smart medical treatment. However, critical challenge exists simultaneously achieving excellent sensing performances with high sensitivity, rapid response, low limit, cycling stability for full‐scale human healthcare detection further timely photothermal therapy. For highly sensitive the spinosum microstructure epidermis dermis takes an important part signal amplification transmission. Inspired by of skin tactile perception, a skin‐inspired flexible sensor is prepared from face‐to‐face assembly as‐prepared polybutylene adipate‐polyurethane (PBAPU) elastomer matrix conducting MXene nanosheets‐coated urchin‐like templated natural chrysanthemum pollen grain microstructures, interdigitated electrode‐coated PBAPU substrate. The newly prepared, exhibiting outstanding tensile strength (18.87 MPa), stretchability (1190%), comparable elastic modulus (1.7 MPa) to skin. as‐assembled exhibits sensitivity (up 784.02 kPa −1 ), limit (0.12 Pa), reliable interfacing. microstructure‐contained possesses efficient heating performance achieve on‐demand therapy rehabilitation training.

Language: Английский

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Mxene-based wearable self-powered and photothermal triboelectric nanogenerator patches for wound healing acceleration and tactile sensing

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 482, P. 148949 - 148949

Published: Jan. 21, 2024

Language: Английский

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Recent advances in two-dimensional nanomaterials for sustainable wearable electronic devices

Journal of Nanobiotechnology, Journal Year: 2024, Volume and Issue: 22(1)

Published: Feb. 15, 2024

Abstract The widespread adoption of smart terminals has significantly boosted the market potential for wearable electronic devices. Two-dimensional (2D) nanomaterials show great promise flexible, electronics next-generation materials and have in energy, optoelectronics, electronics. First, this review focuses on importance functionalization/defects 2D nanomaterials, a discussion different kinds devices, overall structure–property relationship materials. Then, comprehensive review, we delve into burgeoning realm emerging applications nanomaterial-based flexible electronics, spanning diverse domains such as medical health, displays. A meticulous exploration is presented, elucidating intricate processes involved tailoring material properties specific applications. Each research direction dissected, offering insightful perspectives dialectical evaluations that illuminate future trajectories inspire fruitful investigations rapidly evolving field. Graphical

Language: Английский

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