Carbon nanotube yarn strain sensors

Zhao, Haibo; Zhang, Yingying; Bradford, Philip D.; Zhou, Qian; Jia, Q. X.; Fang, Yuan; Zhu, Yuntian

doi:10.1088/0957-4484/21/30/305502

Cited by 222 publications

(148 citation statements)

References 22 publications

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“…Nevertheless, the GF value for our CNT-coated fibers is approximately 6 times larger than for a reported CNT based strain sensor. [16] In Figure 4(e), the different mechanisms that affect the changing resistivity are shown during its deformation. A CNT/B bundle consists of many fibers with a tetrahedral cross-section, and each fiber has a slight twist, resulted in its curly morphology, as is shown in the SEM images in Figure 1.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, as carbon nanotube (CNT) networks are increasingly utilized as highly sensitive sensors for detecting the onset, nature, and evolution of damage in composites, [15] more and more CNT-based sensor materials have been proposed, such as carbon nanotube yarn strain sensors. [16] In the example of human-motion detection, a thin film of aligned single-walled carbon nanotubes were used in wearable and stretchable devices to monitor the deformation of clothing worn over the skin. [17] The CNT-based stretchable electronics can be fabricated, since they are based on the intertwining and curvilinear nature of CNTs, which makes CNTs intrinsically stretchable.…”

Section: Introductionmentioning

confidence: 99%

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Self-monitoring and self-correcting polymer fibers coated with carbon nanotubes

Tai

Liu

Dou

2016

Carbon

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Bandaging, which has been used either to support a medical device such as a dressing or splint, or on its own to provide support to the body or restrict the motion of a part of the body, is further studied in our work in the form of multifunctional materials for self-monitoring and self-correcting by integration with carbon nanotubes (CNTs). Here, modified polymer fibers for bandages can be fabricated from fibers of commercially available bandages with carbon nanotubes uniformly adhering to the fibers, via a simple solution process to produce tough, flexible, and electrically conducting fibers. The conductivity of the coated bandage fibers is reversibly sensitive to strain, and strain in the coated bandage fibers also can be generated by electrical heating, leading to proof-of-concept sensor and actuator demonstrations. Disciplines Engineering | Physical Sciences and Mathematics AbstractBandaging, which has been used either to support a medical device such as a dressing or splint, or on its own to provide support to the body or restrict the motion of a part of the body, is further studied in our work in the form of multifunctional materials for self-monitoring and self-correcting by integration with carbon nanotubes (CNTs).Here, modified polymer fibers for bandages can be fabricated from fibers of commercially available bandages with carbon nanotubes uniformly adhering to the fibers, via a simple solution process to produce tough, flexible, and electrically conducting fibers. The conductivity of the coated bandage fibers is reversibly sensitive to strain, and strain in the coated bandage fibers also can be generated by electrical heating, leading to proof-of-concept sensor and actuator demonstrations.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self-monitoring and self-correcting polymer fibers coated with carbon nanotubes

Tai

Liu

Dou

2016

Carbon

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“…The GF of our asmade CNT yarn, found approximately 0.15, is the smallest value among the CNT yarn GFs in the literature to date [16]- [20]. The improvements in the synthesis of the CNT yarn including the use of a capstan rods system and heat treatment are considered to be the decisive factors for the electrical stability of the CNT yarn.…”

Section: Introductionmentioning

confidence: 85%

Electrically Stable Carbon Nanotube Yarn Under Tensile Strain

Nguyen

Dinh

Phan

et al. 2017

IEEE Electron Device Lett.

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Abstract-We report a highly stable electrical conductance of a compact and well-oriented carbon nanotube yarn under tensile strain. The gauge factor of the yarn was found to be extremely small of approximately 0.15 thanks to the improvements in the dry spinning process, including multi-web spinning and heat treatment. The threshold strain εs, below which the yarn retains its electrical conductance stability, has been also determined to be approximately 15×10 3 ppm. Owing to its highly stable resistance under mechanical strain, the yarn has a good potential as a wiring material for niche applications, where light weight and resistance stability are required.

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“…After fabrication, the CNT yarn is spun around a spool for storing and handling purposes. Piezoresistivity is a unique and the most important property of the CNT yarns for their application as sensors [11][12][13][14][15][16][17][18]. From a microstructural perspective, for low strain levels (< 2 %), metallic nanotubes play a vital role in the change of the electrical resistance [1,11].…”

Section: Introductionmentioning

confidence: 99%

“…It is said that the bundles of carbon nanotubes untwist during loading and contact length decreases (the density of CNT yarns per unit length decreases), which leads to the increase in resistance. In contrast, the electrical resistance decreases during the unloading segments [12,14,15]. In addition, a decrease in resistance due to inter-tube/inter-bundle slippage (inelastic shear motion) caused by yarn's relaxation and structural reformation during the loading segments, and a continuous decrease in resistance during unloading as the yarn recovers its (conductive) structure [16].…”

Section: Introductionmentioning

confidence: 99%

Piezoresistive Response of Integrated CNT Yarns under Compression and Tension: The Effect of Lateral Constraint

Anike¹,

Le²,

Brodeur³

et al. 2017

Preprint

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Carbon nanotube (CNT) yarns are fiber-like materials that exhibit excellent mechanical, electrical and thermal properties. More importantly, they exhibit a piezoresistive response that can be tapped for sensing purposes. The objective of this study is to determine experimentally the piezoresistive response of CNT yarns that are embedded in a polymeric medium while subjected to either compression or tension, and compare it with that of the free or unconstrained CNT yarns. The rationale for this study is the need to know the piezoresistive response of the CNT yarn while in a medium, which provides a lateral constraint to the CNT yarn thus mimicking the response of integrated CNT yarn sensors. The experimental program includes the fabrication of samples and their electromechanical characterization. The CNT yarns are integrated in polymeric beams and subjected to four-point bending allowing the determination of their response under tension and compression. The electromechanical data from a combined Inductance-Capacitance-Resistance (LCR) device and a mechanical testing system were used to determine the piezoresistive response of the CNT yarns. At a strain rate of 0.006 min -1 , the gauge factors obtained under tension for a maximum strain of 0.1 % is ~ 29.3 which is higher than ~ 21.2 obtained under compression. The CNT yarn sensor exhibited strain rate dependence with a gauge factor of approximately 23.0 at 0.006 min -1 , in comparison to 19.0 and 1.3, which were obtained at 0.0005 min -1 and 0.003 min -1 , respectively. There is a difference of up to two orders of magnitude in the sensitivity of the constrained CNT yarn under bending with respect to that of the free CNT yarn under uniaxial tension. However, the difference becomes smaller when the constrained CNT yarn was tested under uniaxial tension. This data and information will be used for future modeling efforts and to study the phenomena that occur when CNT yarns are integrated in polymeric and composite materials and structures.

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Carbon nanotube yarn strain sensors

Cited by 222 publications

References 22 publications

Self-monitoring and self-correcting polymer fibers coated with carbon nanotubes

Self-monitoring and self-correcting polymer fibers coated with carbon nanotubes

Electrically Stable Carbon Nanotube Yarn Under Tensile Strain

Piezoresistive Response of Integrated CNT Yarns under Compression and Tension: The Effect of Lateral Constraint

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