Highly Sensitive and Stretchable Strain Sensor Based on Ag@CNTs

Zhang, Qiang; Liu, Lihua; Zhao, Dong; Duan, Qianqian; Ji, Jianlong; Jian, Aoqun; Zhang, Wendong; Sang, Shengbo

doi:10.3390/nano7120424

Cited by 52 publications

(41 citation statements)

References 29 publications

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“…In addition, an enhanced initial resistance and a non-linear response (sensitivity deviation) are always associated, increasing the need of the complicated calibration 28 . This may attributed to the release of strain energy via fracture of CNT junctions ensuing unsteady response [29][30][31][32] . The difficulty in fabrication of SWCNT based sensors of linear response emanated from ill contact between SWCNT owing to insufficient dispersion of SWCNT bundles in PDMS.…”

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confidence: 99%

A water-resilient carbon nanotube based strain sensor for monitoring structural integrity

et al. 2019

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Monitoring structural integrity during and after extreme events such as an earthquake or a tsunami is a mundane yet important task that still awaits a workable solution. Currently available stress sensors are not sufficiently robust and are affected by humidity. Insufficient information about crack formation preceding structural failure increases risk during rescue operations significantly. Designing durable stress sensors that are not affected by harsh and changing environment and do not fail under catastrophic conditions is a fundamental challenge. To address this problem, we developed a stress sensor based on creased singlewalled carbon nanotubes (SWCNTs) encapsulated in a non-fluorinated superhydrophobic coating. The creased SWCNT film was fabricated and integrated in polydimethylsiloxane (PDMS) to provide a highly linear response under elastic deformation. The non-fluorinated water-repellent coating was fabricated by spray-coating the film with nanosilica particles, providing water resistance during elastic deformation.The compact design and superior water resistance of the sensor, along with its appealing linearity and 1 large stretchability, demonstrates the scalability of this approach for fabricating efficient strain sensors for applications in infrastructure and robotic safety management as well as advanced wearable sensors.Monitoring structural integrity during and after extreme events such as an earthquake or a tsunami is a mundane yet important task that still awaits a workable solution. Additionally, the mechanical frame strength of transportation must be continuously monitored for sufficient safety. Currently available strain sensors are not sufficiently robust and are affected by humidity. A water-proof strain sensor would be applicable for infrastructure safety management in harsh environments. Such a harmless water-proof strain sensor could also be used as an advanced wearable sensor. Insufficient information about crack formation preceding structural failure increases risk during rescue operations significantly. To address this problem, we developed a strain sensor based on creased single-walled carbon nanotubes (SWCNTs) encapsulated in a non-fluorinated superhydrophobic coating. The SWCNT film was fabricated and integrated in polydimethylsiloxane (PDMS) to provide a highly linear response under elastic deformation.The non-fluorinated water-repellent coating was fabricated by spray-coating the film with nanosilica particles, providing water resistance during elastic deformation. The compact design and superior water resistance of the sensor, along with its appealing linearity and large stretchability, demonstrates the scalability of this approach for fabricating efficient strain sensors for applications in infrastructure and robotic safety management.Governments must guarantee safety and present environments to preserve life while maintaining a comfortable urban landscape with minimal economic burden. Particularly, numerous infrastructures, such as buildings, bridges, dams, and tunnels, in adva...

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confidence: 99%

A water-resilient carbon nanotube based strain sensor for monitoring structural integrity

et al. 2019

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“…For the special optical, thermal, catalytic, and electronic properties [1][2][3], one-dimensional (1D) metallic nanostructures have garnered a significant amount of research attention and found application in various devices [4,5]. For example, silver nanowires (AgNWs) have excellent electrical, transmittance, and flexible properties; also, the source of raw materials is wide and cheap [6,7].…”

Section: Introductionmentioning

confidence: 99%

High-Yield Synthesis of Long Silver Nanowires via Chromic Chloride and a Stable Reaction Environment

Zhang

Dang

Cao

et al. 2019

Journal of Nanomaterials

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The search for suitable synthesis methods and parameters capable of controlling the length, diameter, and yield of silver nanowires (AgNWs) is still an emerging strategy today. Therefore, a method for high-yield synthesis of long AgNWs via chromic chloride and a stable reaction environment was proposed. The results show that Cr3+ could restore the adsorbed atomic oxygen quickly and provide a high efficiency in the prevention of the oxidative etching, for the ion of Cr2+ oxidized to Cr3+ has a lower standard electrode potential, and a more stable reaction environment provided by the coupling method could avoid disturbing the growth of the {111} reactive sites of the wires; then, the yield and length of the AgNWs were improved. The length of the AgNWs was over 75 μm and even 160 μm; the yield of the AgNWs was over 90%, which provides the referable basis for the synthesis of ultralong AgNWs.

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“…Strains can be measured by sensors that rely on the piezoresistive effect [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ], the frequency shift of a resonator’s fundamental mode [ 34 , 35 , 36 ], the piezoelectric effect [ 37 , 38 ], the capacitance change [ 39 , 40 , 41 , 42 , 43 ], the optical properties changes [ 44 , 45 , 46 , 47 , 48 , 49 ], and other effects [ 50 , 51 , 52 ]. Piezoresistive effects consist of changes in the electrical resistance of a material when subjected to a mechanical strain.…”

Section: Introductionmentioning

confidence: 99%

“…Other strain sensors rely on the piezoresistive nature of carbon nanotubes that are dispersed in polymeric matrices, forming nanocomposites, and exhibiting a quasi-linear resistance change-strain response with gauge factors varying between −200 and 500 [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. More recently, strain gauges using carbon nanotubes, graphene and other carbon nanomaterials are being developed and offer the promise of high gauge factors [ 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Foil Strain Gauges Using Piezoresistive Carbon Nanotube Yarn: Fabrication and Calibration

Abot

Gongora-Rubio²,

Anike

et al. 2018

Sensors

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Carbon nanotube yarns are micron-scale fibers comprised by tens of thousands of carbon nanotubes in their cross section and exhibiting piezoresistive characteristics that can be tapped to sense strain. This paper presents the details of novel foil strain gauge sensor configurations comprising carbon nanotube yarn as the piezoresistive sensing element. The foil strain gauge sensors are designed using the results of parametric studies that maximize the sensitivity of the sensors to mechanical loading. The fabrication details of the strain gauge sensors that exhibit the highest sensitivity, based on the modeling results, are described including the materials and procedures used in the first prototypes. Details of the calibration of the foil strain gauge sensors are also provided and discussed in the context of their electromechanical characterization when bonded to metallic specimens. This characterization included studying their response under monotonic and cyclic mechanical loading. It was shown that these foil strain gauge sensors comprising carbon nanotube yarn are sensitive enough to capture strain and can replicate the loading and unloading cycles. It was also observed that the loading rate affects their piezoresistive response and that the gauge factors were all above one order of magnitude higher than those of typical metallic foil strain gauges. Based on these calibration results on the initial sensor configurations, new foil strain gauge configurations will be designed and fabricated, to increase the strain gauge factors even more.

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Highly Sensitive and Stretchable Strain Sensor Based on Ag@CNTs

Cited by 52 publications

References 29 publications

A water-resilient carbon nanotube based strain sensor for monitoring structural integrity

A water-resilient carbon nanotube based strain sensor for monitoring structural integrity

High-Yield Synthesis of Long Silver Nanowires via Chromic Chloride and a Stable Reaction Environment

Foil Strain Gauges Using Piezoresistive Carbon Nanotube Yarn: Fabrication and Calibration

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