Highly stretchable and durable fiber-shaped strain sensor with porous core-sheath structure for human motion monitoring

Yue, Xiaoyan; Jia, Yanyan; Wang, Xiaozheng; Zhou, Kangkang; Zhai, Wei; Zheng, Guoqiang; Dai, Kun; Mi, Liwei; Liu, Chuntai; Shen, Changyu

doi:10.1016/j.compscitech.2020.108038

Cited by 106 publications

(91 citation statements)

References 36 publications

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“…The core part of the fiber is surrounded by the CB/PU composite, which is shown as the black region in the figure. Compared with Yue's work23 in which the core region of the fiber is of a regular circular shape, it has been found that the core region of the fiber fabricated in this work exhibits an irregular shape (Figure3(a)) or a slightly scattered appearance (Figure3(b)). This is because the solution for the core (S2) is ejected out of the spinneret in the liquid state and is solidified later than the solution for the sheath (S1).…”

contrasting

confidence: 47%

“…Compared with Yue's work, 23 in which the CB/PU composites only occupy a thin layer in the vicinity of the surface of the fiber, the CB/PU composites occupy a large portion of the cross-section of the fiber fabricated in this work. This can result in different mechanical and electrical properties of the fibers.…”

Section: Resultsmentioning

confidence: 76%

“…This might be due to the high surface tension of the CB-polymer composite, which hinders the contraction of the sheath material during the fiber formation process at a high CB concentration. In contrast, the fiber in Yue's work 23 exhibits a very smooth surface. This might be due to the absence of the drafting process.…”

Section: Resultsmentioning

confidence: 86%

“…The fiber possesses high sensitivity, favorable durability, and a large strain range. 23 However, the diameter of the as-spun fiber is greater than 1.5 mm, which hinders its integration into textiles (yarns or fabrics). In addition, in the fabrication process, the fiber needs to be placed in the coagulation bath for a long time (30 min) in order to obtain a stable structure, which is less efficient for the mass production of the fiber.…”

mentioning

confidence: 99%

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Strain-sensing fiber with a core–sheath structure based on carbon black/polyurethane composites for smart textiles

Pei

2021

Textile Research Journal

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Fiber-shaped sensors have great potential for real-time monitoring of human physiological signals thanks to the merging of electronic and textile technologies. This work reports on the fabrication of a core–sheath structured strain-sensing fiber based on the wet-spinning method. The sensing fiber is composed of a core of non-conducting polyurethane and a conducting sheath of carbon black in a polyurethane matrix. Microscopic observation reveals the irregular shape or scattered appearance of the core as well as the porous structure of the fiber, the diameter of which is in the range 200–500 μm. The electro-mechanical properties and their dependence on carbon black concentration in the sheath and draw ratio between the spinneret and first drafting roller are experimentally investigated. It has been found that the percolation threshold of the fiber is in the range 15–16 wt%. The resistance of the fiber rises stably as the fiber is stretched up to a strain of 120% and increases with the increase of draw ratio between the spinneret and first drafting roller. In the cyclic tensile tests, the resistance of the fiber exhibits good repeatability in subsequent loading–unloading cycles after pre-stretching, despite partial recovery of the resistance in the first few cycles. The integration of the strain-sensing fiber into textiles is demonstrated by the core-spun yarn fabricated based on a modified vortex spinning method. The results of this study indicate the fiber could be a promising candidate for a sensor for smart textiles.

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contrasting

confidence: 47%

Section: Resultsmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 86%

mentioning

confidence: 99%

See 2 more Smart Citations

Strain-sensing fiber with a core–sheath structure based on carbon black/polyurethane composites for smart textiles

Pei

2021

Textile Research Journal

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“…With advances in soft electronic technologies, flexible and stretchable conductors are commonly considered as the key components for the next‐generation flexible devices. [ 1–3 ] With excellent ductility, fatigue durability, ultrasensitivity, and short response time, they have been widely used as sensors in various applications, such as human motion monitoring, [ 4–7 ] human–machine interface, [ 8–11 ] soft robotics, [ 12,13 ] etc. These advantages bring forth huge economic benefits and drastically improve the quality of human life.…”

Section: Introductionmentioning

confidence: 99%

Highly Conductive Silicone Elastomers via Environment‐Friendly Swelling and In Situ Synthesis of Silver Nanoparticles

Yang

Duan

Zhao

2021

Adv Materials Inter

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Flexible and stretchable conductors are crucial components for next‐generation flexible devices. Wrinkled structures often have been created on such conductors by depositing conductive materials on the pre‐stretched or organic solvent swollen samples. Herein, water swelling is first proposed to generate the wrinkled structures on silicone elastomers. By immersing silicone/sugar hybrid in water, a significant amount of swelling occurs as a result of osmosis and capillary interactions with the sugar and silicone matrix. Considering the drastic swelling effect and controllable swelling ratio, water swelling is used to replace the conventional pre‐stretching and organic solvent swelling to fabricate stretchable conductors. In situ growing of silver nanoparticles (AgNPs) is carried out on the swollen silicone elastomers. Wrinkled conductive silicone elastomers are successfully constructed after removing the residual water. The conductive elastomer has a sheet resistance of less than 1 Ω sq‐1 at zero strain and also shows high sensitivity when subjected to external deformation up to 100% strain. The silicone/sugar composite also possesses good 3D printability with the desired shear‐thinning property. Human motion detection is demonstrated using the 3D printed sensors. This work provides a facile and environment‐friendly strategy to fabricate superior flexible and stretchable sensing devices.

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Recent Progress in Essential Functions of Soft Electronic Skin

Chen

Zhu

Chang

et al. 2021

Adv Funct Materials

255

140

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Inspired by the human skin, electronic skins (e-skins) composed of various flexible sensors, such as strain sensor, pressure sensor, shear force sensor, temperature sensor, and humility sensor, and delicate circuits, are emerged to mimic the sensing functions of human skins. In this review, the strategies to realize the versatile functionalities of natural skin-like e-skins, including strain-, pressure-, shear force-, temperature-and humility-sensing abilities, as well as self-healing ability and other functions are summarized. Some representative examples of high-performance e-skins and their applications are outlined and discussed. Finally, the outlook of the future of e-skins is presented.

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Highly stretchable and durable fiber-shaped strain sensor with porous core-sheath structure for human motion monitoring

Cited by 106 publications

References 36 publications

Strain-sensing fiber with a core–sheath structure based on carbon black/polyurethane composites for smart textiles

Strain-sensing fiber with a core–sheath structure based on carbon black/polyurethane composites for smart textiles

Highly Conductive Silicone Elastomers via Environment‐Friendly Swelling and In Situ Synthesis of Silver Nanoparticles

Recent Progress in Essential Functions of Soft Electronic Skin

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