Performance of Flexible Strain Sensors With Different Transition Mechanisms: A Review

Ma, Shidong; Tang, Jian; Yan, Tao; Pan, Zhijuan

doi:10.1109/jsen.2022.3156286

Cited by 38 publications

(20 citation statements)

References 223 publications

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“…Compared with the traditional metal-foil strain gauges with poor stretchability and high hardness, piezoresistive strain sensors based on conductive polymer composites (CPCs) exhibit better flexibility and conformability; hence, CPCs are more suitable for application in wearable electronics . CPC is fabricated by integrating conductive nanomaterials into elastic polymer substrates through mixing and coating processes to establish stretchable conductive networks . The working principle of the CPC-based flexible strain sensors is that the deformation of the elastic polymer substrate causes destruction and reconstruction of the conductive network during applied loading and unloading, resulting in a change in electrical resistance .…”

Section: Introductionmentioning

confidence: 99%

Strain-Sensing Composite Nanofiber Filament and Regulation Mechanism of Shoulder Peaks Based on Carbon Nanomaterial Dispersion

Tang

et al. 2023

ACS Appl. Mater. Interfaces

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Conductive polymer composite-based strain sensors are essential components of flexible wearable devices. However, nonmonotonic responses with shoulder peaks limit their practical application. Herein, we innovatively optimized the shoulder-peak phenomenon in a strain-sensing composite nanofiber filament by regulating carbon nanomaterial dispersion. Further, the preparation methods, characteristics, and performances of the filament strain sensors were systematically introduced. On this basis, transmission electron microscopy, finite element analysis, and mathematic and structural evolution models were used to explore the origin of shoulder peaks and explain the sensing mechanism of conductive networks. Results confirmed that the beacon tower-shaped conductive network designed by constructing nanofiller agglomerates could cause strain concentration and resist the Poisson transverse contraction of nanofibers, considerably improving the monotonicity and sensitivity of the sensor. The strain-sensing performance was optimal when the nanofillers were dispersed using 2.5 wt % of an anionic dispersant. The sensor exhibited a maximum detective strain of 120%, an ultralow detection limit of 0.01%, and high sensitivity and linearity of 9.66 and 0.996 within 20% strain, respectively. Moreover, it showed the advantages of a fast response time (120 ms), excellent durability (3000 cycles), anti-interference, washability, and antibacterial capability. Finally, a smart Kinesio tape was developed for protecting/treating the human body and detecting joint/muscle movement via simple sewing.

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Section: Introductionmentioning

confidence: 99%

Strain-Sensing Composite Nanofiber Filament and Regulation Mechanism of Shoulder Peaks Based on Carbon Nanomaterial Dispersion

Tang

et al. 2023

ACS Appl. Mater. Interfaces

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“…Flexible strain sensors can convert various types of deformation into changes in electrical signals to detect the dynamic features of a physical state. According to the transition mechanism, they can be divided into resistance, capacitance, voltage, inductance, and magnetism types ( Ma et al., 2022 ). Resistance-type sensors have significant advantages because of their simple preparation process, easy signal reception, and stable signal output ( Liu et al., 2019a ).…”

Section: Introductionmentioning

confidence: 99%

“…The ideal electrical conductivity and mechanical properties are essential for a conductive nanomaterial/flexible matrix composite to be used as a sensing element. To obtain high-performance flexible strain sensors, researchers have mainly designed sensors based on two research directions: one is to design sensors with various kinds of geometric structures, such as one-dimensional (1D) fiber and yarn-like sensors, two-dimensional (2D) film and fabric-like sensors, and three-dimensional (3D) sponge, foam, and hydrogel-like sensors ( Ma et al., 2022 ). These strain sensors have shown distinct performance characteristics and applications.…”

Section: Introductionmentioning

confidence: 99%

Sensing mechanism of a flexible strain sensor developed directly using electrospun composite nanofiber yarn with ternary carbon nanomaterials

Tang¹,

Wu²,

Ma³

et al. 2022

iScience

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“…[39,42,43] Moreover, the porous material's dielectric properties and mechanical properties are tunable by adjusting its pore size and material type, so as to provide a way to obtain the desired dielectric layer and improve the sensor performance. [44,45] On the other hand, porous structure electrode leading to electric field leakage has been considered as the mechanism for proximity sensing. [46,47] The combination of hierarchical porous structure may present a novel design for the capacitive pressure/proximity sensor with both of high sensitivity and large detection range.…”

Section: Introductionmentioning

confidence: 99%

Bioinspired Hierarchical Structure for an Ultrawide‐Range Multifunctional Flexible Sensor Using Porous Expandable Polyethylene/Loofah‐Like Polyurethane Sponge Material

Zhao

Guo

Sun

et al. 2022

Advanced Intelligent Systems

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Capacitive sensors show promising applications for human–computer interface due to their potential capabilities of both pressure and proximity sensing. However, the sensitivity loss at large strain and the complicated process of fabrication technology limit related applications. Herein, inspired by gradient and hierarchical structures in biological systems and using porous materials with different stiffness, a capacitive flexible sensor with both proximity and pressure sensing abilities is proposed. Such hierarchical structures effectively reduce the attenuation of sensitivity as the pressure increases, realizing an ultrawide detection range with high sensitivity. A theoretical mathematical model is developed and the corresponding capacitive sensor is fabricated by using the high‐performance porous impregnated dust‐free paper as the electrode and expandable polyethylene (EPE)/loofah‐like polyurethane sponge (LPS) as double‐layer porous dielectric. This sensor has an ultrawide detection range up to 3000 kPa with a significantly low sensitivity loss of 0.0195% kPa−1 and the noncontact sensing mode reaches a sensing range up to 28 cm (0.122 cm−1). Notably, a strategy is provided to design the high sensitivity sensor over an ultrawide detection range from approaching to pressuring, and eventually its promising application is presented as human–computer interaction.

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Performance of Flexible Strain Sensors With Different Transition Mechanisms: A Review

Cited by 38 publications

References 223 publications

Strain-Sensing Composite Nanofiber Filament and Regulation Mechanism of Shoulder Peaks Based on Carbon Nanomaterial Dispersion

Strain-Sensing Composite Nanofiber Filament and Regulation Mechanism of Shoulder Peaks Based on Carbon Nanomaterial Dispersion

Sensing mechanism of a flexible strain sensor developed directly using electrospun composite nanofiber yarn with ternary carbon nanomaterials

Bioinspired Hierarchical Structure for an Ultrawide‐Range Multifunctional Flexible Sensor Using Porous Expandable Polyethylene/Loofah‐Like Polyurethane Sponge Material

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