Wearable Resistive‐Type Stretchable Strain Sensors: Materials and Applications

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 8, 2024

Abstract The rapid advancement of wearable electronics over recent decades has led to the development stretchable strain sensors, which are essential for accurately detecting and monitoring mechanical deformations. These sensors have widespread applications, including movement detection, structural health monitoring, human–machine interfaces. Resistive‐type gained significant attention due their simple design, ease fabrication, adaptability different materials. Their performance, evaluated by metrics like stretchability sensitivity, is influenced choice strain‐sensitive This review offers a comprehensive comparison evaluation materials used in resistive metal semiconductor films, low‐dimensional materials, intrinsically conductive polymers, gels. also highlights latest applications motion healthcare interfaces examining device physics material characteristics. comparative analysis aims support selection, application, tailored specific applications.

Language: Английский

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Bioinspired Omnidirectional Interface Engineered Flexible Island for Highly Stretchable Electronics

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 31, 2025

With the advancement of electronics, there is a growing need to effectively combine rigid, flexible, and stretchable materials build hybrid electronics. However, interfacial transition between rigid/flexible substrates presents considerable challenges, mainly due differences in elastic moduli, complicating their integration for practical usage. Here, bioinspired omnidirectional interfacial-engineered flexible islands (BOIEFI) are introduced robust from substrates. These BOIEFIs enable creation highly durable capable withstanding diverse physical deformations such as stretching, twisting, even poking. Inspired by plant roots, designed with primary secondary root structures that provide mechanical interlocking different moduli. Through experimental computational methods, optimized exhibit significantly enhanced stretchability improved fatigue life. To demonstrate broad applicability, light-emitting diodes (LEDs) integrated into establish display. In addition, human-machine interface device soft pressure sensors an LED array fabricated implementation This approach facilitates harmonious substrates, leading soft, stretchable,

Language: Английский

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Stretchable Serpentine Electrodes with High Fidelity Fabricated Using Orientation‐Controlled Surface Energy‐Directed Assembly

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 9, 2025

Abstract Stretchable serpentine electrodes have garnered significant attention in diverse fields such as embodied artificial intelligence, electronic skin, free‐form displays, stretchable integrated circuits, etc. However, current micro/nano fabrication processes often struggle with compatibility issues on substrates or face challenges related to scalability, fidelity, and resolution. Here, the study has developed an orientation‐controlled surface energy‐directed assembly (SEDA) process for fabricating high‐fidelity, high‐resolution a linewidth of 600 nm. This involves pulling out patterns from nanomaterial suspensions alignment their axial orientation, ensuring that enclosed hydrophobic regions between hydrophilic three‐phase contact line (TPCL) do not form. Consequently, TPCL can freely recede, facilitating high selectivity assembly. In addition length‐to‐spacing ( L/S ) ratio pattern speed also play crucial roles determining fidelity. Specifically, at slow speeds low ratios, lateral receding time is shorter than its longitudinal time, leading excellent selectivity. To demonstrate versatility SEDA process, are assembled various nanomaterials, including silver nanoparticles, nanowires, carbon nanotubes, liquid metal, silicon, paper, polydimethylsiloxane, thermoplastic polyurethane. The exhibit distinct strain‐resistive performance, been applied fields, mechanical strain‐gated transistors, speech recognition micromotion sensors, interconnect circuits light‐emitting diode human‐machine interaction gloves.

Language: Английский

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An 8‐Micrometer‐Thick Film Strain Sensor with Conformal 3D Microstructure for Accurate Detection of Body Motion and Air Leakage

Small, Journal Year: 2025, Volume and Issue: unknown

Published: April 14, 2025

Abstract Elastomer‐based resistive super‐thin film strain sensors show great application potentials in electronic skins, human–machine interaction systems, wearable devices for healthcare, and machine learning algorithms. However, it is challenging to accurately monitor the deformation of human body joints organs with curved surfaces (e.g., knees, throats, finger joints) by only taking advantage material thickness elasticity conventional 2D sensors. Herein, a simple strategy developed fabricate conformal elastomeric thin periodic 3D microstructure inspired ridges valleys skin accurate signal acquisition. Specifically, an 8‐micrometer‐thick elastic sensor fabricated via thermoforming followed situ chemical growth silver nanoparticles. The exhibit excellent linearity (R 2 = 0.99) relatively high sensitivity (gauge factor 14) over wide range (≈43%), ultra‐low detection limit 0.025%, enabling potential applications healthcare monitoring air leakage detection. Thus, this study unveils methodology process microstructure‐enabled conformable sensors, which good conformability multiple mechanical sensing functions advancing development next‐generation flexible

Language: Английский

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Strain‐Insensitive Pre‐Stretch‐Stabilized Polymer/Gold Hybrid Electrodes for Electrochemiluminescent Devices

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(44)

Published: June 21, 2024

Abstract The quest for stretchable properties is at the forefront of research dedicated to on‐skin light–emitting devices. Inspired by natural wonders bioluminescence, electrochemiluminescent devices (ECLDs) are distinguished straightforward design and reduced operating voltage, marking a departure from traditional current‐driven electroluminescent (ACELDs). primary challenge fully‐stretchable ECLDs lies in crafting electrodes that simultaneously satisfy demands conductivity, transparency, stretchability, oxidation resistance, interface stability. This introduces groundbreaking wrinkled polymer‐gold composite electrode. It extends 50% offers outstanding conductivity 10 Ω sq −1 , achieves transparency above 60%, withstands over 000 stretching cycles. Employing this material, alongside electrospinning fiber luminescent layers, enabled creation ECLDs. These not only shine brightly 30 Cd m −2 but also retain more than 90% luminosity when stretched up 50%. Furthermore, work has engineered featuring singular patterns multi‐dot arrays. They exhibit consistent output under bending, twisting, applied skin. findings highlight potential overcoming challenges faced electronic provide new ideas wearable technology seamlessly integrates with human body.

Language: Английский

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Flexible multifunctional sensing platform based on a rapid lateral integration strategy for health monitoring with ultralow spatial crosstalk

Sensors and Actuators B Chemical, Journal Year: 2024, Volume and Issue: 419, P. 136402 - 136402

Published: Aug. 2, 2024

Language: Английский

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Small‐Molecule Mixed Ionic‐Electronic Conductors for Efficient N‐Type Electrochemical Transistors: Structure‐Function Correlations

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 23, 2024

The fundamental challenge in electron-transporting organic mixed ionic-electronic conductors (OMIECs) is simultaneous optimization of electron and ion transport. Beginning from Y6-type/U-shaped non-fullerene solar cell acceptors, we systematically synthesize characterize molecular structures that address the aforementioned challenge, progressively introducing increasing numbers oligoethyleneglycol (OEG; g) sidechains 1 g to 3 g, affording OMIECs 1gY, 2gY, 3gY, respectively. crystal structure 1gY preserves key structural features Yn series: a U-shaped/planar core, close π-π stacking, interlocked acceptor groups. Versus inactive Y6 Y11, all new glycolated compounds exhibit ion-electron transport both conventional electrochemical transistor (cOECT) vertical OECT (vOECT) architectures. Notably, 3gY with highest OEG density achieves high transconductance 16.5 mS, an on/off current ratio ~10

Language: Английский

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Highly stretchable and mechanically robust Copolymer-Based Strain-Engineered substrate for wearable electronics

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: unknown, P. 156471 - 156471

Published: Oct. 1, 2024

Language: Английский

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Superhydrophobic Stretchable Conductive Composite Textile with Weft-Knitted Structure for Excellent Electromagnetic Interference Shielding and Joule Heating Performance

Published: Jan. 1, 2024

Conductive composite textiles (CCTs) as multifunctional integrated platform provide an effective path for developing flexible electromagnetic interference (EMI) shielding composites. However, conventional CCTs suffer from EMI performance failure or the loss of textile's intrinsic properties under large tensile strain. Hence, in this work, a stretchable CCT that retains inherent attributes textile is proposed via weft-knitting and in-situ chemical Ag deposition. The complete continuous silver nanoparticles (AgNPs) conductive networks bring excellent conductivity (38560 S/m) ultrahigh (80.1 dB) unstretched state. When strain applied, fibers are gradually straightened flexural state within 40% strain, then begin to be stretched at bigger strains, which benefits structure. Therefore, on fiber surfaces well protected damage initial range, resulting stable (51.7 even after 1000 cycles 100% Crucially, preserves good air permeability, softness lightness though series modifications strains applied. Other than perforamnce, superhydrophobicity (the contact angle 158°) imparts with capability tackle complex environments easily. Moreover, can readily heated 73.4 °C low voltage 0.5V, showing outstanding Joule heating performance. Even long period (3600 s), maintains superior thermal stability, indicating potential applications wearable heaters. In brief, has comprehensive expected further expand textiles.

Language: Английский

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Flexible Ti3C2Tx-Polyurethane Electrodes for Versatile Wearable Applications

Polymers, Journal Year: 2024, Volume and Issue: 16(18), P. 2623 - 2623

Published: Sept. 17, 2024

With the development of science and technology, wearable electronics are increasingly widely used in medical, environmental monitoring, other fields. Thus, demand for flexible electrodes is increasing. The two-dimensional material Ti3C2Tx has attracted much attention manufacture due to its excellent mechanical electrical properties. However, brittleness pure films become a major obstacle their use as devices. Therefore, solving problem based on while maintaining performance an urgent problem. To solve this problem, was compounded with waterborne polyurethane (WPU), Ti3C2Tx-WPU composite film hierarchical structure constructed by evaporation-assisted self-assembly. not only retains conductivity (100 S m−1) but also flexibility (20 MJ m−3). Furthermore, applied functional devices such contact pressure sensors non-contact proximity sensors. Finally, device demonstrates practical application potential field

Language: Английский

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