An intrinsically stretchable humidity sensor based on anti-drying, self-healing and transparent organohydrogels

Wu, Jin; Wu, Zixuan; Xu, Huihua; Wu, Qian; Liu, Chuan; Yang, Bo‐Ru; Gui, Xuchun; Xie, Xi; Tao, Kai; Shen, Yi; Miao, Jianmin; Norford, Leslie K.

doi:10.1039/c8mh01160e

Cited by 332 publications

(326 citation statements)

References 46 publications

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“…The exchange of water with EG could be attributed to the water dynamics in the polymer matrix. There are three types of water in the hydrogel, including “free water,” “intermediate water” and “nonrotational bound water.” The free water molecules were not bound to the polymer networks and could exchange freely and rapidly with EG molecules. The intermediate water molecules and nonrotational bound water molecules were slowly exchanged due to the hydrogen bonds with polymer networks, which lead to the small weight increase after 2 h immersion.…”

Section: Resultsmentioning

confidence: 99%

Conductive MXene Nanocomposite Organohydrogel for Flexible, Healable, Low‐Temperature Tolerant Strain Sensors

Liao

Guo

Wan

et al. 2019

Adv Funct Materials

678

484

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Conductive hydrogels are attracting tremendous interest in the field of flexible and wearable soft strain sensors because of their great potential in electronic skins, and personalized healthcare monitoring. However, conventional conductive hydrogels using pure water as the dispersion medium will inevitably freeze at subzero temperatures, resulting in the diminishment of their conductivity and mechanical properties; meanwhile, even at room temperature, such hydrogels suffer from the inevitable loss of water due to evaporation, which leads to a poor shelf-life. Herein, an antifreezing, self-healing, and conductive MXene nanocomposite organohydrogel (MNOH) is developed by immersing MXene nanocomposite hydrogel (MNH) in ethylene glycol (EG) solution to replace a portion of the water molecules. The MNH is prepared from the incorporation of the conductive MXene nanosheet networks into hydrogel polymer networks. The as-prepared MNOH exhibits an outstanding antifreezing property (−40 °C), long-lasting moisture retention (8 d), excellent self-healing capability, and superior mechanical properties. Furthermore, this MNOH can be assembled as a wearable strain sensor to detect human biologic activities with a relatively broad strain range (up to 350% strain) and a high gauge factor of 44.85 under extremely low temperatures. This work paves the way for potential applications in electronic skins, human−machine interactions, and personalized healthcare monitoring.

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Section: Resultsmentioning

confidence: 99%

Conductive MXene Nanocomposite Organohydrogel for Flexible, Healable, Low‐Temperature Tolerant Strain Sensors

Liao

Guo

Wan

et al. 2019

Adv Funct Materials

678

484

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“…There are several types of humidity sensors that include resistive [244,[470][471][472][473][474][475][476][477][478][479][480][481][482], capacitive [339,[483][484][485], piezoelectric [486,487], TFT [36], and fibre optic [468,488]. Relative Humidity (RH) is the percentage amount of water vapour in air with regard to the amount needed for saturation at a given temperature and gas pressure, and is the most commonly used term to indicate humidity level in air.…”

Section: Humidity Sensorsmentioning

confidence: 99%

“…Resistive humidity sensors are the most commonly fabricated humidity sensors and are generally fabricated using CB [471], CNTs [472][473][474][475][476], graphene [477][478][479][480], PMMA/poly-[3-(methacrylamino)propyl] trimethyl ammonium cloride (PMAPTAC) [470], SnO 2 / PANI [481], and organohydrogel [482]. A resistive humidity sensor showing a sensitivity of 0.0327 log Z/%RH over a relative humidity range of 10-90% RH was demonstrated [470].…”

Section: Resistive Humidity Sensorsmentioning

confidence: 99%

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Flexible Sensors—From Materials to Applications

et al. 2019

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Flexible sensors have the potential to be seamlessly applied to soft and irregularly shaped surfaces such as the human skin or textile fabrics. This benefits conformability dependant applications including smart tattoos, artificial skins and soft robotics. Consequently, materials and structures for innovative flexible sensors, as well as their integration into systems, continue to be in the spotlight of research. This review outlines the current state of flexible sensor technologies and the impact of material developments on this field. Special attention is given to strain, temperature, chemical, light and electropotential sensors, as well as their respective applications.

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“…In this respect, some strategies were introduced as solutions to prevent the evaporation of water molecules. The use of hygroscopic materials such as ethylene glycol, glycerol, sugar, salts like lithium chloride and sodium chloride has imparted moisture holding capacity into the hydrogels. In addition, an elastomeric coating on the hydrogels can prohibit the evaporation of water …”

Section: Self‐healable Ionic Tactile Sensorsmentioning

confidence: 99%

Ionic Tactile Sensors for Emerging Human‐Interactive Technologies: A Review of Recent Progress

Amoli

Kim

et al. 2019

Adv Funct Materials

153

119

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Ionic tactile sensors (ITS) represent a new class of deformable sensory platforms that mimic not only the tactile functions and topological structures but also the mechanotransduction mechanism across the biological ion channels in human skin, which can demonstrate a more advanced biological interface for targeting emerging human-interactive technologies compared to conventional e-skin devices. Recently, flexible and even stretchable ITS have been developed using novel structural designs and strategies in materials and devices. These skin-like tactile sensors can effectively sense pressure, strain, shear, torsion, and other external stimuli with high sensitivity, high reliability, and rapid response beyond those of human perception. In this review, the recent developments of the ITS based on the novel concepts, structural designs, and strategies in materials innovation are entirely highlighted. In particular, biomimetic approaches have led to the development of the ITS that extend beyond the tactile sensory capabilities of human skin such as sensitivity, pressure detection range, and multimodality. Furthermore, the recent progress in self-powered and self-healable ITS, which should be strongly required to allow human-interactive artificial sensory platforms is reviewed. The applications of ITS in human-interactive technologies including artificial skin, wearable medical devices, and user-interactive interfaces are highlighted. Last, perspectives on the current challenges and the future directions of this field are presented.

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An intrinsically stretchable humidity sensor based on anti-drying, self-healing and transparent organohydrogels

Abstract:
A facile solvent-exchange strategy is devised to fabricate anti-drying, self-healing and transparent organohydrogels for stretchable humidity sensing applications.

Cited by 332 publications

References 46 publications

Conductive MXene Nanocomposite Organohydrogel for Flexible, Healable, Low‐Temperature Tolerant Strain Sensors

Conductive MXene Nanocomposite Organohydrogel for Flexible, Healable, Low‐Temperature Tolerant Strain Sensors

Flexible Sensors—From Materials to Applications

Ionic Tactile Sensors for Emerging Human‐Interactive Technologies: A Review of Recent Progress

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An intrinsically stretchable humidity sensor based on anti-drying, self-healing and transparent organohydrogels

Abstract: A facile solvent-exchange strategy is devised to fabricate anti-drying, self-healing and transparent organohydrogels for stretchable humidity sensing applications.

Cited by 332 publications

References 46 publications

Conductive MXene Nanocomposite Organohydrogel for Flexible, Healable, Low‐Temperature Tolerant Strain Sensors

Conductive MXene Nanocomposite Organohydrogel for Flexible, Healable, Low‐Temperature Tolerant Strain Sensors

Flexible Sensors—From Materials to Applications

Ionic Tactile Sensors for Emerging Human‐Interactive Technologies: A Review of Recent Progress

Contact Info

Product

Resources

About

Abstract:
A facile solvent-exchange strategy is devised to fabricate anti-drying, self-healing and transparent organohydrogels for stretchable humidity sensing applications.