Development of Conductive Hydrogels for Fabricating Flexible Strain Sensors

Small, Journal Year: 2021, Volume and Issue: 18(5)

Published: Oct. 17, 2021

Abstract Conductive hydrogels can be prepared by incorporating various conductive materials into polymeric network hydrogels. In recent years, have been developed and applied in the field of strain sensors owing to their unique properties, such as electrical conductivity, mechanical self‐healing, anti‐freezing properties. These remarkable properties allow hydrogel‐based show excellent performance for identifying external stimuli detecting human body movement, even at subzero temperatures. This review summarizes application fabrication working different modes. Finally, a brief prospectus development future is provided.

Language: Английский

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Biomimetic anti-freezing polymeric hydrogels: keeping soft-wet materials active in cold environments

Materials Horizons, Journal Year: 2020, Volume and Issue: 8(2), P. 351 - 369

Published: Sept. 3, 2020

As one of the most outstanding materials, analysis structure and function hydrogels has been extensively carried out to tailor adapt them various fields application. The high water content, which is beneficial for plenty applications in biomedical setting, prevents adoption flexible electronics sensors real life applications, because lose their excellent properties, including conductivity, transparency, flexibility, etc., upon freezing at sub-zero temperatures. Therefore, depressing liquid-solid phase transition temperature a powerful means expand application scope hydrogels, will benefit chemical engineering materials science communities. This review summarizes recent research progress anti-freezing hydrogels. At first, approaches generation (hydro)gels are introduced mechanisms performances briefly discussed. These either based on addition salts, alcohols (cryoprotectants organohydrogels), ionic liquids (ionogels), modification polymer network or combination several techniques. Then, concise overview leveraged by widened resistance provided future areas developments envisaged.

Language: Английский

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Transparent, mechanically robust, and ultrastable ionogels enabled by hydrogen bonding between elastomers and ionic liquids

Materials Horizons, Journal Year: 2019, Volume and Issue: 7(3), P. 912 - 918

Published: Dec. 4, 2019

A general strategy for the fabrication of mechanically robust ionogels by hydrogen bonding between elastomers and [NTf₂]-based ILs is demonstrated.

Language: Английский

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Ultra-Stretchable, durable and conductive hydrogel with hybrid double network as high performance strain sensor and stretchable triboelectric nanogenerator

Nano Energy, Journal Year: 2020, Volume and Issue: 76, P. 105035 - 105035

Published: July 2, 2020

Language: Английский

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Wearable triboelectric nanogenerators for biomechanical energy harvesting

Nano Energy, Journal Year: 2020, Volume and Issue: 77, P. 105303 - 105303

Published: Aug. 20, 2020

Language: Английский

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Promoting smart cities into the 5G era with multi-field Internet of Things (IoT) applications powered with advanced mechanical energy harvesters

Nano Energy, Journal Year: 2021, Volume and Issue: 88, P. 106304 - 106304

Published: July 4, 2021

Language: Английский

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Mechanically and Electronically Robust Transparent Organohydrogel Fibers

Advanced Materials, Journal Year: 2020, Volume and Issue: 32(8)

Published: Jan. 19, 2020

Stretchable conductive fibers are key elements for next-generation flexible electronics. Most existing electron-based, opaque, relatively rigid, and show a significant increase in resistance during stretching. Accordingly, soft, stretchable, transparent ion-conductive hydrogel have attracted attention. However, difficult to manufacture easy dry freeze, which significantly hinders their wide range of applications. Herein, organohydrogel designed address these challenges. First, newly hybrid crosslinking strategy continuously wet-spins fibers, transformed into by simple solvent replacement. The excellent antifreezing (< -80 °C) capability, stability (>5 months), transparency, stretchability. predominantly covalently crosslinked network ensures the high dynamic mechanical with negligible hysteresis creep, from previous usually suffer. strain sensors made accurately capture high-frequency (4 Hz) high-speed (24 cm s-1 ) motion exhibit little drift 1000 stretch-release cycles, powerful detecting rapid cyclic motions such as engine valves reach previously reported fibers. also demonstrate potential wearable anisotropic sensors, data gloves, soft electrodes, optical

Language: Английский

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Environment Tolerant Conductive Nanocomposite Organohydrogels as Flexible Strain Sensors and Power Sources for Sustainable Electronics

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(24)

Published: April 8, 2021

Abstract Conductive hydrogels (CHs) have been highlighted in the design of flexible strain sensors and stretchable triboelectric nanogenerators (TENGs) on basis their excellent physicochemical properties such as large stretchability high conductivity. Nevertheless, incident freezing drying behaviors CHs by using water solvent dispersion medium limit application scopes significantly. Herein, an environment tolerant ultrastretchable organohydrogel is demonstrated a simple solvent‐replacement strategy, which partial as‐synthesized polyacrylamide/montmorillonite/carbon nanotubes hydrogel replaced with glycerol, leading to temperature toleration (−60 60 °C) good stability (30 days under normal environment) without sacrificing The exhibits ultrawide sensing range (0–4196%) sensitivity 8.5, enabling effective detection discrimination human activities that are gentle or drastic various conditions. Furthermore, assembled single‐electrode TENG, displays energy harvesting ability even 500% robustness directly power wearable electronics harsh cold This work inspires route for multifunctional promises practical self‐powered devices extreme environments.

Language: Английский

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Progress inTENGtechnology—A journey from energy harvesting to nanoenergy and nanosystem

EcoMat, Journal Year: 2020, Volume and Issue: 2(4)

Published: Oct. 11, 2020

Abstract Triboelectric nanogenerator (TENG) technology is a promising research field for energy harvesting and nanoenergy nanosystem (NENS) in the aspect of mechanical, electrical, optical, acoustic, fluidic, so on. This review systematically reports progress TENG technology, terms energy‐boosting, emerging materials, self‐powered sensors, NENS, its further integration with other potential technologies. Starting from mechanisms including ways charge generation we introduce applications harvesters to various kinds that is, physical chemical/gas sensors. After that, NENS are discussed, such as blue energy, human‐machine interfaces (HMIs), neural interfaces/implanted devices, optical interface/wearable photonics. Moving new directions beyond TENG, depict hybrid technologies, dielectric‐elastomer‐enhancement, self‐healing, shape‐adaptive capability, self‐sustained and/or internet things (IoT). Finally, outlooks conclusions about future development trends technologies discussed toward multifunctional intelligent systems. image

Language: Английский

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Recent Progress in Natural Biopolymers Conductive Hydrogels for Flexible Wearable Sensors and Energy Devices: Materials, Structures, and Performance

ACS Applied Bio Materials, Journal Year: 2020, Volume and Issue: 4(1), P. 85 - 121

Published: Aug. 17, 2020

Natural biopolymer-based conductive hydrogels, which combine inherent renewable, nontoxic features, biocompatibility and biodegradability of biopolymers, excellent flexibility conductivity exhibit great potential in applications wearable stretchable sensing devices. Compared to traditional flexible substrates deriving from petro-materials-derived polymers, hydrogels consisting continuous cross-linked polymer networks a large amount water more fantastic combination stretchability because their endow the with mechanical offers them consecutive ionic transport property. Different biopolymers that are extracted bioresource intrinsic commonly considered as appropriate candidates for constructing For example, such cellulose, chitosan, silk fibroin usually chosen promising construct endowing enhanced properties remarkable biocompatibility. This review summarizes recent progress natural utilized electrical devices series typical including fibroin, gelatin. The chemical structures physicochemical four demonstrated, diverse hydrogel sensors discussed detail. Finally, remaining challenges expectations discussed.

Language: Английский

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