Strain sensor based on a flexible polyimide ionogel for application in high- and low-temperature environments

Xiang, Shuangfei; Chen, Shuangshuang; Yao, Mengting; Zheng, Feng; Lu, Qinghua

doi:10.1039/c9tc02719j

Cited by 56 publications

(50 citation statements)

References 39 publications

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“…These can be attached to human skin for real‐time motion monitoring. Strain sensors can be fabricated using various electrical conductors (e.g., carbon nanotubes, [ 19–22 ] graphene, [ 23–25 ] metal nanowires, [ 26 ] and nanocomposites with elastomers [ 27,28 ] ) and ionic conductors (e.g., hydrogels, [ 29–32 ] ionic gels, [ 33–35 ] and ionic liquids (ILs) in an elastic container [ 36–38 ] ). Electrical conductors were employed in first generation strain sensors because of their considerably high gauge factors (in the range of 20–2000).…”

Section: Introductionmentioning

confidence: 99%

“…To address these limitations, strain sensors using rubbery ionic conductors, including hydrogels, organogels, and ionic gels, have been actively investigated for use in stretchable sensing devices. [ 27,30–32,35,36,38,50–53 ] In particular, hydrogels have been widely used in sensor applications, offering reliable device performance under large mechanical deformations of 100% or greater. [ 13,27,54,55 ] However, conventional hydrogel sensors showed significant variation in electrical and mechanical properties depending on the measurement conditions (e.g., atmospheric temperature and humidity), because water can easily evaporate from the hydrogel.…”

Section: Introductionmentioning

confidence: 99%

“…[ 59,60 ] However, organogels still suffer from a certain degree of evaporation. [ 35 ] Furthermore, organogel‐based sensors exhibited relatively low sensitivity and gauge factors. [ 61,62 ]…”

Section: Introductionmentioning

confidence: 99%

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Ultra‐Sensitive and Stretchable Ionic Skins for High‐Precision Motion Monitoring

Kim

Cho

et al. 2021

Adv Funct Materials

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Stretchability and sensitivity are essential properties of wearable electronics for effective motion monitoring. In general, increasing the sensitivity of strain sensors based on ionic conductors trades off elasticity, which results in low sensitivity of the strain sensors at large mechanical deformations. To address this, ion‐permeable conducting polymer electrodes with low contact resistance are utilized in ionic gel‐based strain sensors. Using a rectangular‐shaped ionic gel and ion‐permeable electrodes significantly increase the gauge factor of the strain sensor, similar to the theoretical value at a given strain. To further increase the sensitivity of the strain sensor, the ionic gel is patterned with zigzagged tracks that gap apart as the gel stretches, and the gaps close as the gel contracts, leading to a large variation in the relative resistance upon stretching. By combining the zigzagged ionic gel and the ion‐permeable electrodes, highly sensitive stretchable sensors are realized with a record‐high gauge factor of 173, compared to existing ionic conductor‐based stretchable strain sensors. The zigzag‐patterned ionic sensor can successfully monitor various motions when attached to the human body. These results are expected to afford promising strategies for developing highly sensitive, stretchable sensing systems for E‐skin sensors and soft robotics.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ultra‐Sensitive and Stretchable Ionic Skins for High‐Precision Motion Monitoring

Kim

Cho

et al. 2021

Adv Funct Materials

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“…As seen from the table, solution cast is the easiest forming process to synthesis ionogel material (Figure 3(a)). Hence, most of IFSS are thin film structure originated from the solution-casted synthesis process of ionogel [40,41,44,[46][47][48]54,56,57,60,61]. As a stretchable strain sensor, simple film is the optimum device structure.…”

Section: Manufacturing and Structure Of Ifssmentioning

confidence: 99%

Ionogel-based flexible stress and strain sensors

Zhao

Liu

Wang

et al. 2021

International Journal of Smart and Nano Materials

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Ionogels is a kind of hybrid materials composed of ionic liquids (ILs) and solid polymer network matrix, has been extensively investigated in the most recent decade. Due to the excellent mechanical properties and ionic conductivity, their promising applications in flexible stress and strain sensors have been proposed and explosively developed. In this review, we briefly summarize research progresses on ionogel based flexible stress and strain sensors (IFSSs) from five aspects, including material synthesis, device fabrication, working principles, characteristics and performances, and potential applications. Some outlooks and perspectives are also proposed at the end of review. The review is expected to provide reference and new insights into the research of IFSS.

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“…For the purpose of dissipating thermal heat from these devices, materials with enhanced thermal conductivity are strongly recommended 28 . There are publications of nanocomposites based on electrical conductive materials/polymer for thermal conduction [29][30][31][32] , yet the exposure of electrical conductive materials of electronics and electrical devices may cause the contamination and corrosion, and even the risk of electric shock. Hence, encapsulation with electrical insulating materials is the necessary prerequisite.…”

mentioning

confidence: 99%

A high performance wearable strain sensor with advanced thermal management for motion monitoring

et al. 2020

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Resistance change under mechanical stimuli arouses mass operational heat, damaging the performance, lifetime, and reliability of stretchable electronic devices, therefore rapid thermal heat dissipating is necessary. Here we report a stretchable strain sensor with outstanding thermal management. Besides a high stretchability and sensitivity testified by human motion monitoring, as well as long-term durability, an enhanced thermal conductivity from the casted thermoplastic polyurethane-boron nitride nanosheets layer helps rapid heat transmission to the environments, while the porous electrospun fibrous thermoplastic polyurethane membrane leads to thermal insulation. A 32% drop of the real time saturated temperature is achieved. For the first time we in-situ investigated the dynamic operational temperature fluctuation of stretchable electronics under repeating stretching-releasing processes. Finally, cytotoxicity test confirms that the nanofillers are tightly restricted in the nanocomposites, making it harmless to human health. All the results prove it an excellent candidate for the next-generation of wearable devices.

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Strain sensor based on a flexible polyimide ionogel for application in high- and low-temperature environments

Abstract: A flexible polyimide ionogel was prepared as a strain sensor which can not only be used as a conformal soft material for body motions but also provides an opportunity for controlling AI robots in extreme environments (−60 to 180 °C).

Cited by 56 publications

References 39 publications

Ultra‐Sensitive and Stretchable Ionic Skins for High‐Precision Motion Monitoring

Ultra‐Sensitive and Stretchable Ionic Skins for High‐Precision Motion Monitoring

Ionogel-based flexible stress and strain sensors

A high performance wearable strain sensor with advanced thermal management for motion monitoring

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