A highly stretchable carbon nanotubes/thermoplastic polyurethane fiber-shaped strain sensor with porous structure for human motion monitoring

Wang, Xiaozheng; Sun, Hongling; Yue, Xiaoyan; Yu, Yunfei; Zheng, Guoqiang; Dai, Kun; Liu, Chuntai; Shen, Changyu

doi:10.1016/j.compscitech.2018.09.006

Cited by 151 publications

(106 citation statements)

References 34 publications

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“…[ 32 ] Upon applying a higher tensile strain, the tunnel distance of Gr–Gr became larger and the conductive pathways experienced irreversible destruction, which resulted in the rapid and sharp change of Δ R/R 0 , as shown in Figure 7b,c (red dotted square). [ 5,20 ]…”

Section: Resultsmentioning

confidence: 99%

“…[ 1–3 ] Strain sensor, which can convert physical deformation into measurable signals, has a wide range of applications including software robots, human‐computer interaction, and human health monitoring. [ 4,5 ] Traditional strain sensors based on metal and semiconducting materials have several disadvantages of poor stretchability and unstable electrical conductivity during deformation. Flexible strain sensors in the form of fibers, yarns, fabrics, or films are regarded as the ideal solutions to overcome the problems.…”

Section: Introductionmentioning

confidence: 99%

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Highly Stretchable and Sensitive SBS/Graphene Composite Fiber for Strain Sensors

Zhou

Wang

et al. 2020

Macro Materials & Eng

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Flexible strain sensors have attracted tremendous interests due to the emergence of intelligent wearable technology. Electrically conductive fibers are desirable candidates for flexible strain sensors, but up til now, there still exist enormous challenges to obtain conductive fibers exhibiting simultaneously high stretchability and high strain sensitivity. This paper introduces a poly (styrene‐butadiene‐styrene) (SBS)/graphene (Gr) composite fiber‐based flexible strain sensor fabricated by a facile and highly scalable wet spinning method. The results demonstrate that the graphene content has significant influence on the morphology, mechanical properties, and electromechanical properties of the composite fibers. The fibers with 5 wt% graphene have a wide response range of up to 100% strain, a high electrical sensitivity with the gauge factor of 10083.98 at 100% strain, and meanwhile, a high level of stability for 2100 stretching–releasing cycles under an applied strain of 20%. Furthermore, the SBS‐5%Gr composite fibers display excellent sensing performance in detecting human upper limb movements at different joints including hand joints, wrist joints, elbow joints, and shoulder joints.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly Stretchable and Sensitive SBS/Graphene Composite Fiber for Strain Sensors

Zhou

Wang

et al. 2020

Macro Materials & Eng

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“…By virtue of the 1D structure, fiber‐shaped sensors can be implanted into the body with little injure or they can detect multiple signals simultaneously after integration into a tiny unit . Fiber‐shaped sensors generally work via physical processes on the basis of conducting fiber and optical fiber, and chemical processes based on chemical ligand . Thereinto, fiber optic sensors have already been used in petrochemical, electric power, medical, civil engineering, etc.…”

Section: Introductionmentioning

confidence: 99%

Application Challenges in Fiber and Textile Electronics

et al. 2019

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.201901971. (2 of 25)www.advmat.de www.advancedsciencenews.com energy and then deliver it to power other electronic devices whenever we want. The existing fiber-shaped energy storage devices include the supercapacitor, [15] the lithium (Li)-ion battery, [16] the lithium-sulfur battery, [17] the lithium-air battery, [18] the zinc-air battery, [19] the aluminum-air battery, [20] the sodiumion battery, [21] the zinc-ion battery, [22] and the silver-zinc battery. [23] Among them, the supercapacitor has been reported mostly due to the easy fabrication, and lithium-ion battery has laid the foundation for the development of other fiber-shaped batteries, which are thus discussed mainly in this review. 3) Light-emitting devices have been developed for various applications such as display, illumination, and photo therapy. According to the working mechanisms, there are electroluminescence, [24] mechanoluminescence, [25] photoluminescence, [26] thermoluminescence, [27] sonoluminescence, [28] and chemiluminescence. [29] Among these, fiber-shaped electroluminescent devices have been developed extensively due to their good controllability, driven by direct current (DC) [30] or alternating current (AC) [31] electrical method, which are expounded mainly later. 4) Fibershaped sensors have found great potentials in the field of wearable medical devices for fitness monitoring and medical diagnostics especially as aging populations grow. By virtue of the 1D structure, fiber-shaped sensors can be implanted into the body with little injure or they can detect multiple signals simultaneously after integration into a tiny unit. [32] Fiber-shaped sensors generally work via physical processes on the basis of conducting fiber [33] and optical fiber, [34] and chemical processes based on chemical ligand. [35] Thereinto, fiber optic sensors have already been used in petrochemical, electric power, medical, civil engineering, etc. The detailed discussions about the above three fiber-shaped sensors are presented in the later section.Despite the great progress made in fiber and textile electronics, we have to realize that most of the research results are far from practical applications due to several existing obstacles. The performances of fiber-shaped electronic devices are not good enough to attract investors. For instance, although fiber-shaped solar cells have achieved a record power conversion efficiency (PCE) of 10%, [36] this value falls far below the certified efficiency of 24.2% for planar solar cells. [37] Besides, fiber-shaped electronic devices often decay in performance further as their lengths increase. Apart from low performances, scalable fabrication is another hard nut to crack if fiber-shaped electronic devices are to be commercialized. For one thing, researchers usually can only realize fiber-shaped electronic devices with the lengths from several to hundreds of millimeters at present owing to the absence of appropr...

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“…Recently, various studies have been conducted on nanofiller composites for their application in sensors [ 1 , 2 , 3 ]. Some studies are associated with human motion-detecting sensors, which can detect extremely fine motions such as changes in voice, pulse, and facial expressions as well as large motions such as knee bending and elbow bending [ 4 , 5 , 6 , 7 , 8 , 9 ]. These sensors are utilized in artificial body parts or flexible robots that can imitate human motion, and in human fitness monitoring systems [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Bending Properties of Carbon Nanotube/Polymer Composites with Various Aspect Ratios and Filler Contents

2020

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The key characteristics of bending sensors are piezoresistive effect, hysteresis, and durability. In this study, to investigate the influence of the aspect ratio and contents of multi-walled nanotubes (MWNTs) on the properties of bending sensors, MWNT/polydimethylsiloxane (PDMS) composites were fabricated with various aspect ratios and filler contents. The MWNTs were uniformly dispersed in the composites using the three-roll milling method. By increasing the bending angle gradually, the sensitivity of each composite was analyzed. Furthermore, discontinuous cyclic bending tests were conducted to investigate the piezoresistive effect and hysteresis. In addition, stable repeatability of the composites was confirmed through continuous cyclic bending tests. As a result, optimal aspect ratios and filler contents have been presented for application in bending sensors of MWNT composites.

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A highly stretchable carbon nanotubes/thermoplastic polyurethane fiber-shaped strain sensor with porous structure for human motion monitoring

Cited by 151 publications

References 34 publications

Highly Stretchable and Sensitive SBS/Graphene Composite Fiber for Strain Sensors

Highly Stretchable and Sensitive SBS/Graphene Composite Fiber for Strain Sensors

Application Challenges in Fiber and Textile Electronics

Bending Properties of Carbon Nanotube/Polymer Composites with Various Aspect Ratios and Filler Contents

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