Influence of the pore size on the sensitivity of flexible and wearable pressure sensors based on porous Ecoflex dielectric layers

Ding, Huizhen; Wen, Zheng; Qin, Erqiang; Yang, Yi-Qi; Zhang, Wule; Yan, Bin; Wu, Di; Shi, Zhifeng; Tian, Yongtao; Li, Xinjian

doi:10.1088/2053-1591/ab091a

Cited by 28 publications

(12 citation statements)

References 22 publications

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“…In recent years, porous structures have attracted researchers in the field [13], [14], [15] for their intriguing characteristics. In particular, foams can experience very high compression strain without damaging, and they have been used as compressible materials for soft sensors.…”

Section: Introductionmentioning

confidence: 99%

Analysis and optimization of fully foam-based capacitive sensors

Totaro¹,

Bernardeschi²,

Wang³

et al. 2020

2020 3rd IEEE International Conference on Soft Robotics (RoboSoft)

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This paper presents the electromechanical analysis of ultra-light and highly compressible capacitive pressure sensors based on open-cell foams, with top and bottom surface electrodes built by PEDOT:PSS coating. Multiple samples of porous capacitive sensors were characterized, and experimental results were compared by means of both FEM simulations and theoretical analysis. The agreement between experiments and theoretical/numerical prediction is good, suggesting that this methodology can be a useful tool for fine tuning of the sensor performance (i.e. sensitivity, range) for specific applications. Finally, the proposed foam sensor provides a low-cost, easy-to-implement, robust sensing solution for real-world applications in robotics and wearable systems.

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Section: Introductionmentioning

confidence: 99%

Analysis and optimization of fully foam-based capacitive sensors

Totaro¹,

Bernardeschi²,

Wang³

et al. 2020

2020 3rd IEEE International Conference on Soft Robotics (RoboSoft)

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“…Considering this, the selection of dielectric material is crucial to achieve the desired dynamic range and sensitivity. Soft dielectric elastomers such as Ecoflex and silicone-based elastomeric polymers (e.g., polydimethylsiloxane (PDMS)) have been widely used as dielectric layers in capacitive pressure sensors [15]. PDMS is one of the most attractive dielectric layers due to its excellent mechanical strength, tunable elasticity, flexibility and conformability, and high dielectric properties [16].…”

Section: State Of the Artmentioning

confidence: 99%

Porous Elastomer Based Wide Range Flexible Pressure Sensor for Autonomous Underwater Vehicles

et al. 2022

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This work presents the design and implementation of a porous polydimethylsiloxane (PDMS)-based wide-range flexible pressure sensor for autonomous underwater vehicles. The capacitive sensor, with porous PDMS as dielectric, is encapsulated in bulk PDMS polymer. The fabricated sensor was evaluated over a wide pressure range (0-230 kPa), which is similar to pressures experienced up to approx. 24m below the sea level. The sensors showed linear response when tested in air and near-linear response (98%) when submerged in water. The sensor showed much higher sensitivity (0.375 kPa -1 ) in water than in the air environment. However, the sensor exhibited the performance and sensitivity similar to the air condition (0.005 kPa -1 ) when the readout electronics (encapsulated inside a watertight enclosure) was also submerged inside the water along with the sensor. The fabricated sensor also exhibited fast response and recovery time (190 ms), as well as excellent repeatability and stability (no drift) over tested range of 50 loading and unloading cycles. These results demonstrate the suitability of presented sensors for potential use in applications requiring a wide range of pressure, particularly the underwater robotics where real-time pressure monitoring is critical for autonomous operation.

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“…Conductive nanofillers mainly include metal nanomaterials (silver nanoparticles, [17] silver nanowires, [18] ), carbon nanomaterials (carbon black (CB), [19] carbon nanotubes (CNTs), [20,21] graphene [22,23] ), and intrinsically conductive polymers (polythiophene, [24] polyaniline, [25] polypyrrole [26] ). In addition to researching more new materials to improve the property of the sensor, microstructure designed such as porous structure, [27,28] hollow-sphere microstructure, [29] micropyramid array, [30] fractured microstructure, [31][32][33] and interlocked microstructures [34] are also considered as an effective strategy. Although these reported sensors have high sensitivity and good flexibility, generally majority can only effectively realize only one function (stretching or compressive strain).…”

Section: Multifunctional Light-weight Wearable Sensor Based On 3d Por...mentioning

confidence: 99%

Multifunctional, Light‐Weight Wearable Sensor Based on 3D Porous Polyurethane Sponge Coated with MXene and Carbon Nanotubes Composites

Wen

Nie

Wang

et al. 2021

Adv Materials Inter

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With the rapid development of wearable electronics, a resistive sensor with high performance and multifunctional monitoring abilities turns out to be a great challenge for industrial application fields. Herein, a wearable 3D porous polyurethane (PU) sponge sensor coated with MXene and carbon nanotubes (CNTs) composites is self‐assembled through a simple ultrasonic dip‐coating process. The alternate assembly and the synergistic effect of MXene and CNTs contribute to a tough and complete 1D/2D conductive network, which significantly extends the measurement ability of the proposed MXene/CNTs@PU sensor from a wide‐compressive strain range (−80%) to a wide‐stretching strain range (60%). Moreover, benefit from this unique tough multidimensional MXene/CNTs structure, the presented sensor is endowed with excellent electrical response and stability during the long‐term reproducibility test over 5000 cycles. This study also demonstrates the versatile applications (stretching and compression) of the MXene/CNTs@PU sensor, such as detecting subtle expressions, vocal vibrations, body actions of human motions, and lighting light emitting diode lamps. Thus, this advanced sensor indicates great potential for emerging applications in human–machine interaction, healthcare, and wearable devices.

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Influence of the pore size on the sensitivity of flexible and wearable pressure sensors based on porous Ecoflex dielectric layers

Cited by 28 publications

References 22 publications

Analysis and optimization of fully foam-based capacitive sensors

Analysis and optimization of fully foam-based capacitive sensors

Porous Elastomer Based Wide Range Flexible Pressure Sensor for Autonomous Underwater Vehicles

Multifunctional, Light‐Weight Wearable Sensor Based on 3D Porous Polyurethane Sponge Coated with MXene and Carbon Nanotubes Composites

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