Capacitive Pressure Sensor with Wide-Range, Bendable, and High Sensitivity Based on the Bionic Komochi Konbu Structure and Cu/Ni Nanofiber Network

Wang, Jian; Suzuki, Ryuki; Shao, Marine; Gillot, F; Shiratori, Seimei

doi:10.1021/acsami.9b00941

Cited by 123 publications

(87 citation statements)

References 43 publications

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“…Further, simple molds can be made using commercially available materials, such as salt and instant sugar. [ 93 ] Wang et al used this method to design a bionic komochi konbu dielectric structure (Figure 4B). To fabricate this structure, they poured a mixture of instant sugar powder, salt grains, and water onto a surface and then dried it to make a template for the PDMS elastomer (Figure 5D).…”

Section: Capacitive Pressure Sensorsmentioning

confidence: 99%

“…Once the templated elastomer was fully cured on the template, the sugar and salt crystals could be removed by dissolution with the aid of an ultrasonic bath. [ 93 ] This provides a more cost‐ and time‐effective method of creating a mold for micropatterning, but the mold must be remade for each sample. Moreover, the pattern is less defined than the techniques that employ lithography.…”

Section: Capacitive Pressure Sensorsmentioning

confidence: 99%

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Microengineering Pressure Sensor Active Layers for Improved Performance

Ruth

Feig

Tran

et al. 2020

Adv Funct Materials

379

277

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Pressure sensors play an integral role in a wide range of applications, such as soft robotics and health monitoring. In order to meet this demand, many groups microengineer the active layer-the layer that deforms under pressure and dictates changes in the output signal-of capacitive, resistive/piezoresistive, piezoelectric, and triboelectric pressure sensors in order to improve sensor performance. Geometric microengineering of the active layer has been shown to improve performance parameters such as sensitivity, dynamic range, limit of detection, and response and relaxation times. There are a wide range of implemented designs, including microdomes, micropyramids, lines or microridges, papillae, microspheres, micropores, and microcylinders, each offering different advantages for a particular application. It is important to compare the techniques by which the microengineered active layers are designed and fabricated as they may provide additional insights on compatibility and sensing range limits. To evaluate each fabrication method, it is critical to take into account the active layer uniformity, ease of fabrication, shape and size versatility and tunability, and scalability of both the device and the fabrication process. By better understanding how microengineering techniques and design compares, pressure sensors can be targetedly designed and implemented.

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Section: Capacitive Pressure Sensorsmentioning

confidence: 99%

Section: Capacitive Pressure Sensorsmentioning

confidence: 99%

Microengineering Pressure Sensor Active Layers for Improved Performance

Ruth

Feig

Tran

et al. 2020

Adv Funct Materials

379

277

View full text Add to dashboard Cite

show abstract

“…The structural design of dielectric layers is important to control the sensing performance of such sensors. These designs include wrinkled structures, [ 22,123,127 ] pyramid shapes, [ 45,134,135 ] air gaps, [ 122,129 ] conformal structures, [ 114,120 ] micropillars/microtower patterns, [ 128,131 ] bionic komochi konbu structures, [ 132 ] parallel lines, [ 57 ] nanofibers, [ 126 ] microporous structures, [ 133 ] and ecoflex layers. [ 136,137 ] The materials and designs of capacitive pressure sensors are chosen to achieve high stretchability, high sensitivity, wide pressure range, low detectable pressure limit, and high linearity.…”

Section: Capacitive Stretchable Sensorsmentioning

confidence: 99%

Advances in Rational Design and Materials of High‐Performance Stretchable Electromechanical Sensors

Dinh

Nguyen

Phan

et al. 2020

Small

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curved surfaces and deformed objects. [5,6] An effective solution is using stretchable intrinsic materials and stretchable structural designs to form mechanical sensors. [7,8] Compared to conventional rigid sensors, it is desirable for stretchable sensors to provide mechanical robustness, biocomparability, multifunctionality, as well as comfort of wearing such sensors. [9,10] Stretchable electromechanical sensors are capable of being comfortably attached on the human body and skin and perceiving mechanical stimuli. These sensors have huge potential applications in personal healthcare, including detection of human motion/gesture, breath, and pulse monitoring. Stretchable electromechanical sensors have recently attracted great interest due to their high sensitivity, stretchability, simplicity in design, and implementation. Compared with the other kinds of sensors, for example, stretchable piezoelectric/triboelectric sensors, electromechanical sensors usually require supply power or battery.A stretchable sensor typically consists of a sensing block embedded or integrated into a stretchable substrate that can be elongated under application of mechanical stimuli. [11,12] The sensing block acts as a mechanical sensing unit, which for instance converts stress/strain into a measurable electrical signal. The presence of nanomaterials and composites in the sensing block has been utilized as a preferable design for stretchable sensors. [11,13] Selection criteria of these materials include structural stretchability, suitable conductivity, and high mechanical strength. Designing the sensing structure aims for high sensitivity, fast response, linearity, and a wide working range. [14,15] The integration of nanomaterials and nanocomposites into stretchable sensors are currently an emerging trend of wearable sensors in their research, development, and commercialization. [10,11] The development of stretchable sensors with low power consumption for portable applications is also of great interest. [16,17] The conventional design method for "partly stretchable" sensing devices integrates "hard" sensors and "soft" interconnects to form "island-interconnect" configurations. [18,19] This approach deploys an isolated island to carry the rigid sensors and a stretchable network of interconnections. Geometric engineering structures including serpentine and fractal designs have been widely employed, to achieve stretchability Stretchable and wearable sensor technology has attracted significant interests and created high technological impact on portable healthcare and smart human-machine interfaces. Wearable electromechanical systems are an important part of this technology that has recently witnessed tremendous progress toward high-performance devices for commercialization. Over the past few years, great attention has been paid to simultaneously enhance the sensitivity and stretchability of the electromechanical sensors toward high sensitivity, ultra-stretchability, low power consumption or selfpower functionalities, miniaturisation as well a...

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“…Nonwoven nanofiber mats, called nanowebs, produced by electrospinning have the potential for wide applications owing to their ultrathin scale and high surface area . Notably, a dielectric layer with a porous three‐dimensional nonwoven nanoweb structure is more deformable than film layers, which may possibly furnish a highly sensitive response to mechanical stimuli.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of capacitive yarn torsion sensors based on an electrospinning coating method

Choi

Moon

Kim

et al. 2019

Polymer International

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A yarn‐based capacitive torsion sensor was produced using a simple electrospinning coating method. It was expected that nonwoven nanofiber mats, as a coating layer, would exhibit excellent performance owing to their high surface area and porous three‐dimensional nonwoven structure, which is more deformable than that of films. The electrospinning process was investigated by image analysis to generate a suitable structure of the nanofiber coating layer. The thickness of the layer was controlled by varying the electrospinning coating time (10, 20 and 30 min). Yarn sensors with coating layers of different thicknesses were manufactured by twisting two coated fibers, while simultaneously measuring the capacitance. The best sensitivity was observed with the 10 min coated yarn, due to the largest valid twist level range. It is proposed that the distance between the electrodes and the dielectric constant of the material play an important and complex role in the capacitive response of the twisted yarn, caused by the porous three‐dimensional nonwoven structure of the coated layer and the molecular mobility of the polymer. This simple coating method is expected to be useful in a wide range of applications, such as wearable devices, by facilitating convenient fabrication and repair of the flexible sensors. Moreover, high performance of the sensor could be realized due to the structural advantage of the sensing layer. © 2019 Society of Chemical Industry

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Capacitive Pressure Sensor with Wide-Range, Bendable, and High Sensitivity Based on the Bionic Komochi Konbu Structure and Cu/Ni Nanofiber Network

Cited by 123 publications

References 43 publications

Microengineering Pressure Sensor Active Layers for Improved Performance

Microengineering Pressure Sensor Active Layers for Improved Performance

Advances in Rational Design and Materials of High‐Performance Stretchable Electromechanical Sensors

Fabrication of capacitive yarn torsion sensors based on an electrospinning coating method

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