Ultra-stretchable and anti-freezing conductive organohydrogel reinforced with ionic clusters for wearable strain sensors

Guo, Chuanluan; Zhu, Aoqi; Wang, Xiaohong; Dai, Juguo; Xu, Yiting; Zeng, Birong; Chen, Guorong; Dai, Lizong

doi:10.1016/j.snb.2022.131796

Cited by 16 publications

(13 citation statements)

References 43 publications

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Section: Resultsmentioning

confidence: 99%

“…[21] The absorption peak at 1052 cm −1 was associated with the stretching of the S=O bonds [22] and the peak at 1440, 1406, 1320, and 955 cm −1 could be attributed to the reinforcement of C-H bending, which further confirmed the presence of DMSO. [23] The effects of I.L.s' proportion on the stability, adhesion, and conductivity of OIGs were then investigated. As shown in Figure S7 (Supporting Information), the control gel without I.L.…”

Section: Design Optimization and Characterization Of The Oigmentioning

confidence: 99%

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Environmentally Adaptable Organo–Ionic Gel‐Based Electrodes for Real‐Time On‐Skin Electrocardiography Monitoring

Tang

Sha

et al. 2023

Adv Healthcare Materials

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On‐skin personal electrocardiography (ECG) devices, which can monitor real‐time cardiac autonomic changes, have been widely applied to predict cardiac diseases and save lives. However, current interface electrodes fail to be unconditionally and universally applicable, often losing their efficiency and functionality under harsh atmospheric conditions (e.g., underwater, abnormal temperature, and humidity). Herein, an environmentally adaptable organo–ionic gel‐based electrode (OIGE) is developed with a facile one‐pot synthesis of highly conductive choline‐based ionic liquid ([DMAEA‐Q] [TFSI], I.L.) and monomers (2,2,2‐trifluoroethyl acrylate (TFEA) and N‐hydroxyethyl acrylamide (HEAA). In virtue of inherent conductivity, self‐responsive hydrophobic barriers, dual‐solvent effect, and multiple interfacial interactions, this OIGE features distinct sweat and water‐resistance, anti‐freezing and anti‐dehydration properties with strong adhesiveness and electrical stability under all kinds of circumstances. In contrast to the dysfunction of commercial gel electrodes (CGEs), this OIGE with stronger adhesion as well as skin tolerability can realize a real‐time and accurate collection of ECG signals under multiple extreme conditions, including aquatic environments (sweat and underwater), cryogenic (<−20°C) and arid (dehydration) environments. Therefore, the OIGE shows great prospects in diagnosing cardiovascular diseases and paves new horizons for multi‐harsh environmental personalized healthcare.

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Section: Resultsmentioning

confidence: 99%

Section: Design Optimization and Characterization Of The Oigmentioning

confidence: 99%

Environmentally Adaptable Organo–Ionic Gel‐Based Electrodes for Real‐Time On‐Skin Electrocardiography Monitoring

Tang

Sha

et al. 2023

Adv Healthcare Materials

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“…25 An alternative approach is to add low-weightmolecule alcohols such as glycerol and ethylene glycol (EG) to compete with the hydrogen bonding system of water molecules, thus generating stable molecular clusters with water to reduce the freezing temperature of water. [26][27][28][29][30] Jing Xin's team used an EG/ H 2 O binary system to prepare a freeze-resistant conducting organogel, which was stable at À20 1C and had a wide working temperature range (À20 to 60 1C) and strain sensing capabilities (0-250%). 31 Alternatively, the introduction of dynamic chemical bonds in the polymer backbone to build dynamic cross-linking networks can trigger self-healing in response to appropriate external stimuli.…”

Section: Introductionmentioning

confidence: 99%

Self-healable and freeze-resistant polyelectrolyte based on an EG anchor chain and dual dynamic reversible interaction as highly sensitive ionic skin

et al. 2023

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“…The poor freezing tolerance of hydrogels in extremely cold environments is another concern to be addressed. Antifreezing agents, including alcohols (glycerol (GL) and ethylene glycol), salts (calcium chloride and sodium chloride), and zwitterionic osmolytes (proline and betaine), were heavily doped into hydrogels to prevent freezing. ,− Among these methods, organohydrogels have been developed by introducing alcohols to avoid freezing and drying. − However, these additions can significantly increase the viscosity of aqueous solution in hydrogels and reduce the ionic conductivity as both alcohols and zwitterionic osmolytes are nonelectrolytes. In comparison, salts not only work as electrolytes to provide conductive ions but also serve as antifreezing agents to depress the water-freezing point.…”

Section: Introductionmentioning

confidence: 99%

3D Printable Organohydrogel with Long-Lasting Moisture and Extreme-Temperature Tolerance for Flexible Electronics

Li,

Zhou

2023

ACS Appl. Mater. Interfaces

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Hydrogels with high electrical conductivity and mechanical stretchability are promising materials for flexible electronics. However, traditional hydrogels are applied in short-term usage at room temperature or low temperature due to their poor water-retention ability and freezing-tolerance property. Here, a dually cross-linked glycerol–organohydrogel (GL–organohydrogel) based on GL and acrylic acid was synthesized in a GL–water binary solvent. Fe3+ ions working as an electrolyte were added to improve the conductivity of the organohydrogel and form coordination interactions between Fe3+ ions and carboxyl groups of acrylic acid. The strong hydrogen bonding between GL and water molecules firmly lock water in the organohydrogel network, thereby endowing the GL–organohydrogel with the antifreezing property, long-term stability, and moisture lock-in capability. Our organohydrogel could endure extremely low temperature (−80 °C) over 30 days without freezing and retain its water content (almost 100% of its initial state) after being stored at room temperature (25 °C, 54% humidity) for 30 days. It also demonstrated desired stretchable properties, conductivity, three-dimensional (3D) printability, and self-healing ability. A wearable data glove was constructed by using the GL–organohydrogel and digital light processing technology. This work opens a new avenue for developing hydrogels with long-term stability, moisture lock-in capability, and extreme-temperature tolerance for stretchable electronics.

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Ultra-stretchable and anti-freezing conductive organohydrogel reinforced with ionic clusters for wearable strain sensors

Cited by 16 publications

References 43 publications

Environmentally Adaptable Organo–Ionic Gel‐Based Electrodes for Real‐Time On‐Skin Electrocardiography Monitoring

Environmentally Adaptable Organo–Ionic Gel‐Based Electrodes for Real‐Time On‐Skin Electrocardiography Monitoring

Self-healable and freeze-resistant polyelectrolyte based on an EG anchor chain and dual dynamic reversible interaction as highly sensitive ionic skin

3D Printable Organohydrogel with Long-Lasting Moisture and Extreme-Temperature Tolerance for Flexible Electronics

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