An integrated transparent, UV-filtering organohydrogel sensor <i>via</i> molecular-level ion conductive channels

Pan, Xiaofeng; Wang, Qinhua; Guo, Runsheng; Ni, Yonghao; Li, Kai; Ouyang, Xinhua; Chen, Lihui; Huang, Liulian; Cao, Shilin; Xie, Mingying

doi:10.1039/c8ta12360h

Cited by 151 publications

(118 citation statements)

References 53 publications

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“…In contrast, the residual mass of the hydrogel without LiCl reduced to only 40%. The water-retention capacity of PAAm-collagen hydrogel in comparison with orther hydrogels was shown in Table S3 [ 41,[48][49][50][51]. Due to the excellent water retention ability, the PAAm-collagen hydrogel still possessed high mechanical property and conductivity after being stored at 25°C for 7 days (Fig.…”

Section: Resultsmentioning

confidence: 99%

An environment-stable hydrogel with skin-matchable performance for human-machine interface

et al. 2021

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Ionic hydrogel-based sensors have shined a spotlight on wearable electronics. However, the sensitivity and reliability of hydrogel devices are significantly hampered by the weak adhesion of skin-sensor interface as well as inferior temperature tolerance. Here, inspired by the structure and composition of dermis, a novel skin-attachable and environment-stable hydrogel was designed by integrating collagen into the LiCl-containing chemically cross-linked polyacrylamide hydrogel. The hydrogel exhibited skin-like mechanical properties of low modulus, superior stretchability as well as excellent elasticity. Furthermore, the introduction of collagen endowed the hydrogel with robust and seamless interfaces with diverse materials, including the curved skin. As a result, the hydrogel is capable of serving as a human-machine interface for collecting reliable electrocardiography (ECG) signals and discerning various human motions, with high sensitivity (gauge factor = 10.7), fast response, negligible hysteresis as well as extensive monitoring range. Notably, the hydrogel that can mimick the temperature-tolerant mechanism of most organisms possesses persistent stabilization of adhesive, conductive, sensory and mechanical performances at subzero or ambient conditions. The skin-inspired strategy paves an effective way for the design of multifunctional materials with potential applications in next-generation electronics.

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Section: Resultsmentioning

confidence: 99%

An environment-stable hydrogel with skin-matchable performance for human-machine interface

et al. 2021

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“…For instance, the palm prints are clearly seen through the PAM-5 hydrogel. The anti-UV effect of the hydrogel is mostly derived from the absorption of UV light by the benzene ring (from SL and TA) [4]. Figure 2c shows that the TA@SL-PAM hydrogel can use conductive Ca 2+ to achieve the circuit connectivity (0.91 S/m).…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, the antibacterial and antioxidant properties are advantageous to CHs in preparing static electrodes suitable for long-term physiological monitoring. More importantly, ultraviolet (UV) protection seems to be essential because people are extremely susceptible to UV radiation from sunlight [4]. Unfortunately, it is difficult to prepare a hydrogel combing multi-functional properties simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Adhesive, Transparent Tannic Acid@ Sulfonated Lignin-PAM Ionic Conductive Hydrogel Electrode with Anti-UV, Antibacterial and Mild Antioxidant Function

et al. 2019

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Inspired by mussel adhesion chemistry and ion electronics, a novel Ca2+-tannic acid@ sulfonated lignin-polyacrylamide (TA@SL-PAM) hydrogel was prepared via Ca2+-TA@SL composites and the PAM system, where a Ca2+-TA@SL composite was fabricated via TA doping with SL and the subsequent adsorption of Ca2+. The properties of the hydrogel were thoroughly investigated and the hydrogel was presented as multifunctional. The introduction of Ca2+-TA@SL composites endowed the hydrogel with excellent conductivity, adhesion and ultraviolet (UV) resistance, and improved antioxidant and antibacterial properties. More importantly, the Ca2+-TA@SL-PAM hydrogel electrode could accurately detect physiological signals of human (e.g., electrocardiogram (ECG), electromyography (EMG).

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“…Owing to the distinct antifreezing and antidehydration properties, the organohydrogel has aroused great interest among researchers since it was introduced [ 12 , 13 , 14 , 15 , 22 ]. Various organohydrogels and organohydrogel-based applications have emerged recently, and the glycerol [ 14 , 15 , 22 , 23 , 24 , 25 , 26 ], ethylene glycol (EG) [ 13 , 15 , 27 , 28 , 29 , 30 , 31 ], DMSO [ 32 , 33 ], and sorbitol [ 15 , 34 ] are widely used. There are two popular strategies to fabricate organohydrogels.…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, Lu and coworkers synthesized the adhesive and conductive organohydrogel with long-lasting liquid retention at the temperature range from −20 to 60 °C by in situ polymerization in the glycerol–water binary solvent [ 14 ]. Since then, various organohydrogels were prepared by in-situ gelling in the organic–water binary solvent [ 25 , 26 , 29 , 30 , 31 , 32 , 33 , 35 , 36 , 37 , 38 , 39 ]. The second synthesis strategy is to soak the preformed hydrogel in the organic or organic–water binary solvent for solvent displacement [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis Antifreezing and Antidehydration Organohydrogels: One-Step In-Situ Gelling versus Two-Step Solvent Displacement

Deng

Zhou

2020

Polymers

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Organohydrogels with distinct antifreezing and antidehydration properties have aroused great interest among researchers, and various organohydrogels and organohydrogel-based applications have emerged recently. There are two popular synthesis strategies to prepare these antifreezing and antidehydration organohydrogels: the in-situ gelling and the solvent displacement strategies. Although both strategies have been widely applied, there is a lack of comparative study of these two strategies. In this work, to elucidate the comparative advantages of the two synthesis strategies, we studied and compared the mechanical and environmental tolerant properties of the organohydrogels synthesized from both strategies. The glycerol-based and ethylene glycol-based chemical polyacrylamide (PAAm) organohydrogel and the glycerol-based physical gelatin organohydrogel were synthesized and studied. Through the comparative study, we have found that the organohydrogels from different strategies with the same dispersion medium showed similar antifreezing and antidehydration properties but different mechanical properties. The mechanical properties of these organohydrogels are influenced by two opposite factors for each strategy: the enhanced physical interactions induced strengthening and solvent effect or swelling induced weakening. We hope this study may provide a better understanding of the synthesis strategies of organohydrogels and provide a valuable guide to choose the suitable synthesis strategy for each application.

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An integrated transparent, UV-filtering organohydrogel sensor via molecular-level ion conductive channels

Abstract: Transparent, UV-filtered, anti-freezing, and moisture-retention organohydrogel-based sensors are prepared by incorporating ions/microparticles into a binary solvent system.

Cited by 151 publications

References 53 publications

An environment-stable hydrogel with skin-matchable performance for human-machine interface

An environment-stable hydrogel with skin-matchable performance for human-machine interface

Adhesive, Transparent Tannic Acid@ Sulfonated Lignin-PAM Ionic Conductive Hydrogel Electrode with Anti-UV, Antibacterial and Mild Antioxidant Function

Synthesis Antifreezing and Antidehydration Organohydrogels: One-Step In-Situ Gelling versus Two-Step Solvent Displacement

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