Design of flexible strain sensor with both ultralow detection limit and wide sensing range via the multiple sensing mechanisms

Chen, Jianwen; Zhu, Guoxuan; Wang, Fei; Xu, Youquan; Wang, Chengbao; Zhu, Yutian; Jiang, Wei

doi:10.1016/j.compscitech.2021.108932

Cited by 55 publications

(35 citation statements)

References 34 publications

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“…Moreover, the V-IL/TPU sensor exhibits excellent stability for long-term service comparing with numerous previously reported resistance-type strain sensor. 5,8,9,15,36,37 The outputted ΔR/R 0 signal of the V-IL/TPU sensor has nearly no change after 1000 cycles of the loading− unloading process at a strain amplitude of 100% (Figure 4d), indicating that the sensor has superior durability and dynamic electromechanical reliability.…”

Section: Resultsmentioning

confidence: 99%

Breathable Strain/Temperature Sensor Based on Fibrous Networks of Ionogels Capable of Monitoring Human Motion, Respiration, and Proximity

Chen

Wang

Zhu

et al. 2021

ACS Appl. Mater. Interfaces

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113

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Wearable strain and temperature sensors are desired for human−machine interfaces, health monitoring, and human motion monitoring. Herein, the fibrous mat with aligned nanofibers of ionic liquid (IL)/thermoplastic polyurethane (TPU) ionogels is fabricated via an electrospinning technique. The resultant fibrous mat is cut into a rectangle specimen and electrodes are loaded along the direction perpendicular to the nanofiber orientation to design a high-performance multimodal sensor based on an ionic conducting mechanism. As a strain sensor, the obtained sensor exhibits a wide strain working range (0−200%), a fast response and recovery (119 ms), a low detection limit (0.1%), and good reproducibility because of the reversible and deformable ionic conductive pathways of the sensor. Moreover, the sensor also exhibits excellent temperature-sensing behaviors, including a monotonic thermal response, high sensitivity (2.75% °C−1 ), high accuracy (0.1 °C), a fast response time (2.46 s), and remarkable repeatability, attributable to the negative temperature coefficient behavior of the IL/TPU fibrous mat. More interestingly, the IL/TPU fibrous sensor possesses good breathability, which is desired for wearable electronics. Because of these excellent sensing capabilities in strain and temperature, the sensor can not only monitor tiny and large human motions but also detect respiration and proximity, exhibiting enormous potential in wearable electronics.

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Section: Resultsmentioning

confidence: 99%

Breathable Strain/Temperature Sensor Based on Fibrous Networks of Ionogels Capable of Monitoring Human Motion, Respiration, and Proximity

Chen

Wang

Zhu

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

113

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“…Applications of SWCNT networks in thin-film transistors and integrated circuits, as stretchable TCFs in various sensors and devices, and as stretchable electrode materials owing to new form factors such as flexibility and stretchability are already shown by various research groups. [64,180,[191][192][193][194] The key points for further research in this area are also to improve optoelectronic performance, deeper understand the microstructural origin of resistance-strain dependence, and integrate such stretchable SWCNT-based structures along with other compliant rigid interfaces. Developing a stretchable electrode that is transparent as well is especially important for prospective applications in the rapidly growing fields of wearable electronics and Internet of Things, which are shaping the function and view of future electronic devices.…”

Section: Beyond Existing Materials: Stretchable Swcnt-based Tcfsmentioning

confidence: 99%

Transparent Conducting Films Based on Carbon Nanotubes: Rational Design toward the Theoretical Limit

et al. 2022

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Electrically conductive thin-film materials possessing high transparency are essential components for many optoelectronic devices. The advancement in the transparent conductor applications requires a replacement of indium tin oxide (ITO), one of the key materials in electronics. ITO and other transparent conductive metal oxides have several drawbacks, including poor flexibility, high refractive index and haze, limited chemical stability, and depleted raw material supply. Single-walled carbon nanotubes (SWCNTs) are a promising alternative for transparent conducting films (TCFs) because of their unique and excellent chemical and physical properties. Here, the latest achievements in the optoelectronic performance of TCFs based on SWCNTs are analyzed.Various approaches to evaluate the performance of transparent electrodes are briefly reviewed. A roadmap for further research and development of the transparent conductors using "rational design," which breaks the deadlock for obtaining the TCFs with a performance close to the theoretical limit, is also described.

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“…The type of the strain sensor can be classified into piezoelectric [ 1 ], piezoresistive [ 7 , 9 , 12 ], and resistive [ 10 , 13 ]. To ensure flexibility, researchers compose flexible polymer substrates (e.g., polydimethylsiloxane (PDMS) [ 14 ], rubber [ 15 ], thermoplastic polyurethane [ 16 , 17 ], and hydrogel [ 18 , 19 , 20 , 21 ]) with conductive nanomaterials (e.g., graphene [ 22 , 23 ], carbon nanotubes (CNT) [ 24 , 25 ], and MXene [ 16 , 26 ]). The recombination mode can be classified as a filling type [ 27 ], sandwich type [ 24 ], or adsorption type [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

“…To ensure flexibility, researchers compose flexible polymer substrates (e.g., polydimethylsiloxane (PDMS) [ 14 ], rubber [ 15 ], thermoplastic polyurethane [ 16 , 17 ], and hydrogel [ 18 , 19 , 20 , 21 ]) with conductive nanomaterials (e.g., graphene [ 22 , 23 ], carbon nanotubes (CNT) [ 24 , 25 ], and MXene [ 16 , 26 ]). The recombination mode can be classified as a filling type [ 27 ], sandwich type [ 24 ], or adsorption type [ 28 ]. The response of flexible electronic materials to strain is known to depend on the material properties, and strain sensors require maximum deformation response and sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Wrinkles for Tunable Strain Sensing Based on Programmable, Anisotropic, and Patterned Graphene Hybrids

Chu

Gong

et al. 2022

Polymers

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Flexible, stretchable, wearable, and stable electronic materials are widely studied, owing to their applications in wearable devices and the Internet of Things. Because of the demands for both strain-insensitive resistors and high gauge factor (GF) strain-sensitive materials, anisotropic strain sensitivity has been an important aspect of electronic materials. In addition, the materials should have adjustable strain sensitivities. In this work, such properties are demonstrated in reduced graphene oxide (RGO) with hierarchical oriented wrinkle microstructures, generated using the two-step shrinkage of a rubber substrate. The GF values range from 0.15 to 28.32 at 100% strain. For device demonstrations, macrostructure patterns are designed to prepare patterned wrinkling graphene at rubber substrate (PWG@R). Serpentiform curves can be used for the constant-value resistor, combined with the first-grade wrinkles. Strip lines can increase the strain-sensing property, along with the second-grade wrinkles. The patterned sensor exhibits improved GF values range from 0.05 to 49.5. The assembled sensor shows an excellent stability (>99% retention after 600 cycles) with a high GF (49.5). It can monitor the vital signs of the throat and wrist and sense large motions of fingers. Thus, PWG@R-based strain sensors have great potential in various health or motion monitoring fields.

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Design of flexible strain sensor with both ultralow detection limit and wide sensing range via the multiple sensing mechanisms

Cited by 55 publications

References 34 publications

Breathable Strain/Temperature Sensor Based on Fibrous Networks of Ionogels Capable of Monitoring Human Motion, Respiration, and Proximity

Breathable Strain/Temperature Sensor Based on Fibrous Networks of Ionogels Capable of Monitoring Human Motion, Respiration, and Proximity

Transparent Conducting Films Based on Carbon Nanotubes: Rational Design toward the Theoretical Limit

Hierarchical Wrinkles for Tunable Strain Sensing Based on Programmable, Anisotropic, and Patterned Graphene Hybrids

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