Recyclable, stretchable and conductive double network hydrogels towards flexible strain sensors

Lai, Jialiang; Zhou, Hongwei; Wang, Mingcheng; Chen, Yaokun; Zhao, Jin; Li, Shuangli; Yang, Jingjing; Jin, Xilang; Liu, Hanbin; Zhao, Weifeng

doi:10.1039/c8tc04958k

Cited by 91 publications

(49 citation statements)

References 35 publications

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“…At the same time, the introduction of PAA short chains can further increase the crosslinking density of the hydrogel since PAA contains massive carboxyl groups. [ 28 ] Finally, we obtain a fully physical cross‐linking 3D network structure hydrogel based on the multiple hydrogen bonds. Based on the ATR spectra of the different hydrogels, the observed changes of characteristic peaks (moved peak at 3321 and at 3315 cm −1 , respectively) can corroborate the generation of multiple hydrogen bonds in the hydrogel networks (Figure S2, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…Figure S13 (Supporting Information) displayed the tensile strength of the SN‐hydrogels with β‐CD 3.5% reached a stable state after 48 h. Because the osmotic pressure of the SN‐hydrogel inside and the PAA/KCl solution was different, the short PAA chains and ions were driven into the SN‐hydrogel network until realize homogeneous distribution. [ 28 ] In the meantime, the mechanical strength of the SN‐hydrogels can also realize a balance and reached a maximum value to form the DN‐hydrogel by the rebuilding of hydrogen bonds.…”

Section: Resultsmentioning

confidence: 99%

“…produced an ionic conductive PVA‐based hydrogel with excellent mechanical strength (1.3 MPa) and high conductivity as flexible pressure sensor, but it has no transparency. [ 28 ] Hence, for the applications in skin‐like stretchable sensor or tissue engineering, it is a significant challenge to play a well synergy effect among good conductivity, high mechanical performance, and excellent transparency or other necessary properties to realize multifunction.…”

Section: Introductionmentioning

confidence: 99%

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Highly Strong and Transparent Ionic Conductive Hydrogel as Multifunctional Sensors

Dang

Liu

et al. 2020

Macro Materials & Eng

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Ionic conductive hydrogels as promising materials have become focus of artificial soft tissue or soft stretchable electronic devices. Especially, the next‐generation flexible electronics greatly require achieving multifunction simultaneously. Herein, a transparent hydrogel with high mechanical properties (1.73 MPa for mechanical stress, 630% for mechanical strain) and excellent ionic conductivity is fabricated based on a fully physical cross‐linked network. The stiff long polyvinyl alcohol (PVA) chains as a skeleton to form a “hard” network and the short polyacrylic acid (PAA) chains regard as the “soft” network. Moreover, the biomaterial β‐cyclodextrin (β‐CD) as physical cross‐linkers is used in the “hard–soft” hybrid networks. The construction of “soft and hard” structure is successful to integrate the good transparency, remarkable mechanical properties, and outstanding sensitivity (strain, pressure, pH, and organic solvent) together for assembling multiple sensors, which hold a promising practical development value in the domain of soft wearable electronics and sensing materials in the future.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Highly Strong and Transparent Ionic Conductive Hydrogel as Multifunctional Sensors

Dang

Liu

et al. 2020

Macro Materials & Eng

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“…Conductive hydrogels have mechanical flexibility and controllable electronic properties, and are one of the hottest materials for electronic sensors [1,2], flexible skins [3,4], supercapacitors [5,6,7], and nerve electrodes [8]. With the development of smart devices, more and more studies are focusing on smart materials [9,10,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

Smart Composite Hydrogels with pH-Responsiveness and Electrical Conductivity for Flexible Sensors and Logic Gates

et al. 2019

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Stimuli-responsive conductive hydrogels have a wide range of applications due to their intelligent sensing of external environmental changes, which are important for smart switches, soft robotics, and flexible sensors. However, designing stimuli-responsive conductive hydrogels with logical operation, such as smart switches, remains a challenge. In this study, we synthesized pH-responsive conductive hydrogels, based on the copolymer network of acrylic acid and hydroxyethyl acrylate doped with graphene oxide. Using the good flexibility and conductivity of these hydrogels, we prepared a flexible sensor that can realize the intelligent analysis of human body motion signals. Moreover, the pH-responsive conductive hydrogels were integrated with temperature-responsive conductive hydrogels to develop logic gates with sensing, analysis, and driving functions, which realized the intellectualization of conductive hydrogels.

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“…Based on a series of recent breakthroughs in material and technical science, various innovative sensors for skin strain measurement have appeared [25,26,27,28]. Hyper-stretchable and flexible sensors are fabricated to measure large deformation [29,30,31,32]. For example, Wang et al [29] prepared a commendable skin strain sensor with high fracture elongation up to 2000%.…”

Section: Introductionmentioning

confidence: 99%

Ultrasoft, Adhesive and Millimeter Scale Epidermis Electronic Sensor for Real-Time Enduringly Monitoring Skin Strain

Zhang

Xing

2019

Sensors

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Epidermal electronic sensors (EESs) possess great advantages in the real-time and enduring monitoring of human vital information compared to the traditional medical device for intimately making contact with human skin. Skin strain is a significant and effective routine to monitor motion, heart rate, wrist pulse, and skin growth in wound healing. In this paper, a novel skin sensor combined with a ternary conductive nanocomposite (Carbon black (CB)/Decamethylcyclopentasiloxane (D5)/Silbione) and a two-stage serpentine connector is designed and fabricated to monitor skin strain. The ultrasoft (~2 kPa) and adhesive properties of the ternary conductive nanocomposite ensure the capacity of the EES to intimately couple with human skin in order to improve accuracy with a relative error of 3.39% at strain 50% as well as a large strain range (0~50%) and gauge factor (GF ~2.5). The millimeter scale EES (~5 mm × 1 mm × 100 μm), based on the micro-nano fabrication technique, consisted of a two-stage serpentine connector and screen print of the ternary conductive nanocomposite. EESs with high comprehensive performance (electrical and mechanical properties) are fabricated to confirm the analytical results and monitor the motion of a human hand. The good agreement between experimental and analytical results paves the way for bettering monitoring of skin growth during wound healing in order to avoid necrosis and scarring. This EES in monitoring the motion of a human exhibit presents a promising application for assisting prosthetic movement.

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Recyclable, stretchable and conductive double network hydrogels towards flexible strain sensors

Abstract: Recyclable, stretchable, conductive and photoluminescent double network hydrogels are fabricated and utilized in flexible resistive-type strain sensors.

Cited by 91 publications

References 35 publications

Highly Strong and Transparent Ionic Conductive Hydrogel as Multifunctional Sensors

Highly Strong and Transparent Ionic Conductive Hydrogel as Multifunctional Sensors

Smart Composite Hydrogels with pH-Responsiveness and Electrical Conductivity for Flexible Sensors and Logic Gates

Ultrasoft, Adhesive and Millimeter Scale Epidermis Electronic Sensor for Real-Time Enduringly Monitoring Skin Strain

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