Stretchable strain sensor with a hollow structure via molding for visual detection of 3D deformation

Xu, Liqiang; Sun, Quan; Tang, Chengli; Hu, Xuxiao; Lu, Yebo

doi:10.1016/j.matlet.2021.131268

Cited by 5 publications

(3 citation statements)

References 17 publications

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“…Meanwhile, their surface reflectance intensity exhibits a strong dependence on the applied strain, which can be used to quantitatively reveal the substrate deformation. [ 37 ] On the other hand, upon exposure to gaseous stimuli such as aqueous vapor (ethanol, acetone), a rapid shift in the structural color from purple to blue could be observed in 10 ms (Figure 1g); once the stimuli are removed, the COF coating rapidly (≈100 ms) reverts to its original color. This unique responsive behavior positions MS COF coatings as a strong contender for real‐time, naked‐eye detection of volatile and hazardous chemicals.…”

Section: Resultsmentioning

confidence: 99%

“…Such unique reflection intensitystrain correlation makes it possible for us to detect local strain simply by optical observation, which is of great interest in areas like structural materials or soft robots. [37,49] Intriguingly, although the initial strain disrupts the integration of the deposited COF coating, its apparent coloration features, both hue and lightness, fully recover when the applied strain is released. This superior angle-independent coloration and exceptional mechanical stability make MS COF coating an ideal material for colorationrelated applications in flexible devices where durability to complex deformation is required.…”

Section: Angle Independence and Mechanical Robustness Of Ms Cof Coatingmentioning

confidence: 99%

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Meta‐Structured Covalent Organic Framework Nanocoatings with Active and Angle‐Independent Structural Coloration

Jiang,

Chen,

Zhang

et al. 2024

Advanced Materials

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High‐performance multifunctional nanocoatings not only protect and enhance substrate materials, but also offer additional functionalities. This demands a sophisticated coordination of the coating's inherent properties and microstructural features. Here we present a multi‐functional active nanocoating via meta‐structural engineering of covalent organic framework (COF) deposition materials. Our COF nanocoating, characterized by well‐defined micropores (1‐2 nm), meta‐structured textures (30‐300 nm), tailored thickness (100‐300 nm), and good uniformness, showcases a unique combination of angle‐independent structural coloration and ultrafast responsiveness to gaseous stimuli. Remarkably, it demonstrates good compatibility with a wide range of inert substrate materials, from rigid ones like glass and metal to flexible elastomers and nanomaterial films of various shapes and sizes. This versatility enables the facile development of devices that can optically report information about their environments. Examples include chemically active coatings with ultrafast (∼ 10 ms) color‐changing behaviors and programmable actuation behaviors upon exposure to gaseous stimuli, and mechanically active coatings that can detect substrate strain up to 50% yet maintain structural robustness and consistent coloration hue. We believe that meta‐structural engineering of COF nanocoatings on inert substrates could enable them to respond to environmental stimuli, potentially indicating a new trend in developing multifunctional materials and smart devices.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%

Section: Angle Independence and Mechanical Robustness Of Ms Cof Coatingmentioning

confidence: 99%

Meta‐Structured Covalent Organic Framework Nanocoatings with Active and Angle‐Independent Structural Coloration

Jiang,

Chen,

Zhang

et al. 2024

Advanced Materials

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“…Despite these excellent achievements and ongoing efforts of viscoelastic polymer-based stretchable sensors, for the perspective of their commercialization, temperature. ,− It is also understood that these technical issues arise from the deviation of linear stress–strain behavior of viscoelastic stretchable polymers, particularly in large deformation states, while also benefiting from the same nature for stretchable sensors. , Environmental changes to stretchable sensors also aggravate the purpose and stability of accurate monitoring of physiological information from the human body. − So, it is necessary to take full advantage of the inherently stretchable nature of viscoelastic polymers while also eliminating or alleviating nonlinear stress–strain behavior. , However, current ion gel-based stretchable sensors may not fully compensate for nonlinear stress–strain mechanical behavior and accommodate environmental changes as well, often leading to inaccuracies in human body monitoring and gesture detection. To maximize the accuracy of gesture detection solely by the stand-alone wearable stretchable sensor, a highly nonlinear stress–strain stretchable device platform with an environmental compensation algorithm should be developed.…”

Section: Introductionmentioning

confidence: 99%

Machine Learning-Enabled Environmentally Adaptable Skin-Electronic Sensor for Human Gesture Recognition

Song,

Nguyen,

Lee

et al. 2024

ACS Appl. Mater. Interfaces

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Stretchable sensors have been widely investigated and developed for the purpose of human motion detection, touch sensors, and healthcare monitoring, typically converting mechanical/structural deformation into electrical signals. The viscoelastic strain of stretchable materials often results in nonlinear stress−strain characteristics over a broad range of strains, consequently making the stretchable sensors at the body joints less accurate in predicting and recognizing human gestures. Accurate recognition of human gestures can be further deteriorated by environmental changes such as temperature and humidity. Here, we demonstrated an environmentadaptable high stress−strain linearity (up to ε = 150%) and highdurability (>100,000 cycles) stretchable sensor conformally laminated onto the body joints for human gesture recognition. The serpentine configuration of our ionic liquid-based stretchable film enabled us to construct broad data sets of mechanical strain and temperature changes for machine learning-based gesture recognition. Signal recognition and training of distinct strains and environmental stimuli using a machine learning-based algorithm analysis successfully measured and predicted the joint motion in a temperature-changing environment with an accuracy of 92.86% (R-squared). Therefore, we believe that our serpentine-shaped ion gel-based stretchable sensor harmonized with machine-learning analysis will be a significant achievement toward environmentally adaptive and multianalyte sensing applications. Our proposed machine learning-enabled multisensor system may enable the development of future electronic devices such as wearable electronics, soft robotics, electronic skin, and human-machine interaction systems.

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Highly flexible and sensitive Ti3C2 MXene@polyurethane composites for piezoresistive pressure sensor

et al. 2022

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Stretchable strain sensor with a hollow structure via molding for visual detection of 3D deformation

Cited by 5 publications

References 17 publications

Meta‐Structured Covalent Organic Framework Nanocoatings with Active and Angle‐Independent Structural Coloration

Meta‐Structured Covalent Organic Framework Nanocoatings with Active and Angle‐Independent Structural Coloration

Machine Learning-Enabled Environmentally Adaptable Skin-Electronic Sensor for Human Gesture Recognition

Highly flexible and sensitive Ti3C2 MXene@polyurethane composites for piezoresistive pressure sensor

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