A highly resilient and <scp>ultra‐sensitive</scp> hydrogel for wearable sensors

Luo, Chunhui; Huang, Min; Liu, Hong‐Min

doi:10.1002/app.51925

Cited by 18 publications

(8 citation statements)

References 80 publications

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“…The mechanical properties of the hydrogel were measured by universal material testing machine. 38 In the compression test, a cylindrical hydrogel with a diameter of 20 mm and a height of 20 mm was placed on the lower plate and compressed by the upper plate at a strain rate of 10 mm min −1 . For tensile test, the sample was made into a cylindrical strip (length 40 mm, diameter 3 mm) and stretched using a clamp attachment 50 mm for the minimum strain rate.…”

Section: Methodsmentioning

confidence: 99%

Conductive, self-healing, and antibacterial Ag/MXene-PVA hydrogel as wearable skin-like sensors

Chen

2022

J Biomater Appl

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The rapid development of flexible electronic technology has led to the in-depth study of flexible wearable sensors to achieve accurate sensing under different external stimuli. However, it is still a huge challenge to develop hydrogel-based wearable skin-like sensors with super ductility, high sensitivity, and self-healing properties. Herein, the Ti3C2 type of MXene was synthesized, and the Ag/MXene nanocomplexes were incorporated into polyvinyl alcohol-borax matrix to construct a novel composite hydrogel as the multifunctional nanofillers, which could bring both improved properties and novel functionalities. The Ag/MXene-Poly (vinyl alcohol) (PVA) hydrogel displayed integrated merits of highly strain sensitive (GF = 3.26), self-healing (within 10 min, 91% healing efficiency), and excellent antibacterial activity. The hydrogel could be assembled into a wearable skin-like sensor to monitor human movement, including large deformations (finger, elbow, wrist, and knee bending) and tiny deformations (mouth’s movement and throat vocalization) in real time. Therefore, this work shed a new light on the development of flexible wearable skin-like sensors for the personalized healthcare monitoring, human–machine interfaces, and artificial intelligence.

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Section: Methodsmentioning

confidence: 99%

Conductive, self-healing, and antibacterial Ag/MXene-PVA hydrogel as wearable skin-like sensors

Chen

2022

J Biomater Appl

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“…By placing sensors at different positions, ΔR/R 0 was recorded to monitor various human movements and facial expressions. 45 The gauge factor (GF) was an important index for evaluating the sensitivity of hydrogel sensors, which was calculated from Equation (2):…”

Section: Electrical Measurementsmentioning

confidence: 99%

Anisotropic strain sensors to realize skin‐comparable performances

Wang,

Deng,

Luo

2023

J of Applied Polymer Sci

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Conductive hydrogels (CHs) are promising candidates for wearable devices. However, it remains challenging for traditional CHs to realize a combination of self‐adhesive and skin‐comparable performances. Herein, a stretch‐induced orientation strategy was demonstrated to achieve this goal. The hydrogel was fabricated from poly(vinyl alcohol), aluminum sulfate, tannin acid, and deionized water, which exhibited skin‐comparable elastic modulus (26.3 kPa), stretchability (180%), and water content (87.6%). Meanwhile, it had anisotropic properties. For instance, the mechanical and anisotropy ratios between parallel and orthogonal directions were 1.77 and 2.02, respectively. Furthermore, the presence of free ions within regular conductive channels imparted stable conductivity (gauge factor of 2.2 within 200% strains), fast response (0.2 s), and low detect limit (a strain of 0.2%). Additionally, the existence of catechol groups from tannin acid enabled self‐adhesion ability (adhesion strength of 73.9 kPa). All of these merits show promising potential in wearable devices and electronic skins.

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“…It has a unique porous structure and can provide an effective channel for ion transport (Zhao X. et al, 2019), so it has high ionic conductivity. At the same time, they have high flexibility, transparency, and good biocompatibility (Luo et al, 2021;Ding et al, 2022). Although highly tensile and self-healing ionic hydrogels are usually reported, most synthetic ionic hydrogels exhibit strain-softening properties (Peng et al, 2022;Zhou et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Highly Transparent, Self-Healing, and Self-Adhesive Double Network Hydrogel for Wearable Sensors

Chen

Liu

Wang

et al. 2022

Front. Bioeng. Biotechnol.

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Hydrogel-based flexible electronic devices are essential in future healthcare and biomedical applications, such as human motion monitoring, advanced diagnostics, physiotherapy, etc. As a satisfactory flexible electronic material, the hydrogel should be conductive, ductile, self-healing, and adhesive. Herein, we demonstrated a unique design of mechanically resilient and conductive hydrogel with double network structure. The Ca2+ crosslinked alginate as the first dense network and the ionic pair crosslinked polyzwitterion as the second loose network. With the synthetic effect of these two networks, this hydrogel showed excellent mechanical properties, such as superior stretchability (1,375%) and high toughness (0.57 MJ/m3). At the same time, the abundant ionic groups of the polyzwitterion network endowed our hydrogel with excellent conductivity (0.25 S/m). Moreover, due to the dynamic property of these two networks, our hydrogel also performed good self-healing performance. Besides, our experimental results indicated that this hydrogel also had high optical transmittance (92.2%) and adhesive characteristics. Based on these outstanding properties, we further explored the utilization of this hydrogel as a flexible wearable strain sensor. The data strongly proved its enduring accuracy and sensitivity to detect human motions, including large joint flexion (such as finger, elbow, and knee), foot planter pressure measurement, and local muscle movement (such as eyebrow and mouth). Therefore, we believed that this hydrogel had great potential applications in wearable health monitoring, intelligent robot, human-machine interface, and other related fields.

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A highly resilient and ultra‐sensitive hydrogel for wearable sensors

Cited by 18 publications

References 80 publications

Conductive, self-healing, and antibacterial Ag/MXene-PVA hydrogel as wearable skin-like sensors

Conductive, self-healing, and antibacterial Ag/MXene-PVA hydrogel as wearable skin-like sensors

Anisotropic strain sensors to realize skin‐comparable performances

Highly Transparent, Self-Healing, and Self-Adhesive Double Network Hydrogel for Wearable Sensors

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