Temperature-sensitive and solvent-resistance hydrogel sensor for ambulatory signal acquisition in “moist/hot environment”

Qu, Xinyu; Sun, Hanjun; Kan, Xiaolong; Lei, Bing; Shao, Jinjun; Wang, Qian; Wang, Wenjun; Ni, Zhenhua; Dong, Xiaochen

doi:10.1007/s12274-023-5730-y

Cited by 13 publications

(3 citation statements)

References 39 publications

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“…The decreasing electrical resistance with temperature is primarily ascribed to stretching of the two-dimensional rGO nanosheets by the action of polymer chains during the heating process, producing more efficient conductive pathways that facilitate electron transmission. Moreover, the calculated TCR values are −4.2 and −0.04 °C –1 in the range of −40 to 10 °C and 10–60 °C, respectively, which are superior to those of most reported counterparts (Figure S7), ,− manifesting a favorable thermal response performance. Meanwhile, stable temperature sensing behaviors in cyclic testing through switching the temperature from 25 °C to −20, −30, and −40 °C (Figure b) as well as 40, 50, and 60 °C (Figure c) can be detected, proving the satisfactory temperature sensing reliability and replicability of the MSCG-OH.…”

Section: Resultsmentioning

confidence: 70%

Temperature-Tolerant Versatile Conductive Zwitterionic Nanocomposite Organohydrogel toward Multisensory Applications

Han,

Wang,

Sun

et al. 2024

ACS Appl. Mater. Interfaces

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Conductive hydrogels (CHs) are emerging materials for next generation sensing systems in flexible electronics. However, the fabrication of competent CHs with excellent stretchability, adhesion, self-healing, photothermal conversion, multisensing, and environmental stability remains a huge challenge. Herein, a nanocomposite organohydrogel with the above features is constructed by in situ copolymerization of zwitterionic monomer and acrylamide in the existence of carboxylic cellulose nanofiber-carrying reduced graphene oxide (rGO) plus a solvent displacement strategy. The synergy of abundant dipole−dipole interactions and intermolecular hydrogen bonds enables the organohydrogel to exhibit high stretchability, strong adhesion, and good self-healing. The presence of glycerol weakens the formation of hydrogen bonds between water molecules, endowing the organohydrogel with excellent environmental stability (−40 to 60 °C) to adapt to different application scenarios. Importantly, the multimodal organohydrogel presents excellent sensing behavior, including a high gauge factor of 16.3 at strains of 400−1440% and a reliable thermal coefficient of resistance (−4.2 °C−1 ) over a wide temperature widow (−40 to 60 °C). Moreover, the organohydrogel displays a highly efficient and reliable photothermal conversion ability due to the favorable optical absorbing behavior of rGO. Notably, the organohydrogel can detect accurate human activities at ambient temperature, demonstrating potential applications in flexible intelligent electronics.

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Section: Resultsmentioning

confidence: 70%

Temperature-Tolerant Versatile Conductive Zwitterionic Nanocomposite Organohydrogel toward Multisensory Applications

Han,

Wang,

Sun

et al. 2024

ACS Appl. Mater. Interfaces

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“…The remarkable temperature-responsive properties of hydrogels enable their application in real-time temperature monitoring of both environmental conditions and liquid systems. Additionally, hydrogels serve as effective tools for controlling temperature during reactions or processing, facilitating precise control and enhancing product performance optimization ( Qu et al, 2023 ). Moreover, hydrogels can serve as temperature indicators, offering valuable insights through observations of shape changes.…”

Section: Chitosan Based Hydrogels In Food Applicationsmentioning

confidence: 99%

Chitosan-based hydrogels: From preparation to applications, a review

Hong,

Qiu,

Wang

et al. 2024

Food Chemistry: X

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“…With the rapid development of flexible electronics, smart equipment, and micro-nano processing technology, flexible wearable electronics have become the frontier of micro-nano electronics researches. − Flexible intelligent electronics, which integrate information on perception, response, and feedback, closely rely on the adaptability and reliability of integrated circuits and show outstanding advantages in the field of artificial intelligence, − human–computer interaction, , biomedicine, , and drug control release. , Based on various physical and chemical modifications, the multifunctional flexible strain sensors can achieve highly sensitive and rapid responses to different kinds of stimuli (e.g., stress, heat, and pH) through efficient conversion of electromechanical signals and profile wide application prospects in the area of wearable electronic devices. − …”

Section: Introductionmentioning

confidence: 99%

Ionic Liquid/Water Binary Solvent Anti-Freezing Hydrogel for Strain and Temperature Sensors

Liu,

Zhang,

Cui

et al. 2024

ACS Appl. Mater. Interfaces

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Hydrogels are widely applied in the flexible wearable electronic devices field owing to their skin-like stretchability, superb biocompatibility, and high conductivity retention under mechanical deformations. Nevertheless, hydrogels are prone to freezing at low temperatures and losing water at high temperatures, which seriously limits their practical applications. Herein, a binary solvent system of ionic liquid (1-ethyl-3-methylimidazolium chloride) and water was prepared to endow the ionic hydrogel high ionic conductivity (0.28 S m–1 at 25 °C), high transparency (94.26%), and superior freezing tolerance (−50 °C). The multiple hydrogen bonds formed among polymer chains, water, and ionic liquids significantly improved the mechanical properties of the ionic hydrogel, enabling excellent tensile properties (strain >1800%) and durability (1000 times at 100% strain). Moreover, the ionic hydrogel was further assembled into a dual-response sensor, which exhibited satisfactory sensitivity to both tension (gauge factor = 2.15 at 200% strain) and temperature (temperature coefficient of resistance = −1.845%/°C) and can be applied for human motion and body temperature monitoring. This study provides a versatile method for preparing multifunctional hydrogels with a wide range of applications and lays the groundwork for human movement detection and smart health care.

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Temperature-sensitive and solvent-resistance hydrogel sensor for ambulatory signal acquisition in “moist/hot environment”

Cited by 13 publications

References 39 publications

Temperature-Tolerant Versatile Conductive Zwitterionic Nanocomposite Organohydrogel toward Multisensory Applications

Temperature-Tolerant Versatile Conductive Zwitterionic Nanocomposite Organohydrogel toward Multisensory Applications

Chitosan-based hydrogels: From preparation to applications, a review

Ionic Liquid/Water Binary Solvent Anti-Freezing Hydrogel for Strain and Temperature Sensors

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