Ultra-highly sensitive, low hysteretic and flexible pressure sensor based on porous MWCNTs/Ecoflex elastomer composites

Wen, Zheng; Yang, Jiahao; Ding, Huizhen; Zhang, Wule; Wu, Di; Xu, Junmin; Shi, Zhifeng; Xu, Tingting; Tian, Yongzhi; Li, Xinjian

doi:10.1007/s10854-018-0242-3

Cited by 33 publications

(25 citation statements)

References 31 publications

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“…The Young's modulus of GelMA hydrogels is two orders of magnitude lower (Figure 2e), and their electrical permittivity is three times higher ( Figure 2f) than those of their elastomeric competitors. [37][38][39][40][41][42] These outstanding properties indicate the great potential of GelMA hydrogels in developing high-performance capacitive pressure sensors.…”

Section: Mechanical Properties and Relative Permittivity Characterizamentioning

confidence: 99%

Gelatin Methacryloyl‐Based Tactile Sensors for Medical Wearables

Zhang

Chen

et al. 2020

Adv Funct Materials

123

106

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Gelatin methacryloyl (GelMA) is a widely used hydrogel with skin-derived gelatin acting as the main constituent. However, GelMA has not been used in the development of wearable biosensors, which are emerging devices that enable personalized healthcare monitoring. This work highlights the potential of GelMA for wearable biosensing applications by demonstrating a fully solution-processable and transparent capacitive tactile sensor with microstructured GelMA as the core dielectric layer. A robust chemical bonding and a reliable encapsulation approach are introduced to overcome detachment and water-evaporation issues in hydrogel biosensors. The resultant GelMA tactile sensor shows a highpressure sensitivity of 0.19 kPa −1 and one order of magnitude lower limit of detection (0.1 Pa) compared to previous hydrogel pressure sensors owing to its excellent mechanical and electrical properties (dielectric constant). Furthermore, it shows durability up to 3000 test cycles because of tough chemical bonding, and long-term stability of 3 days due to the inclusion of an encapsulation layer, which prevents water evaporation (80% water content). Successful monitoring of various human physiological and motion signals demonstrates the potential of these GelMA tactile sensors for wearable biosensing applications.

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Section: Mechanical Properties and Relative Permittivity Characterizamentioning

confidence: 99%

Gelatin Methacryloyl‐Based Tactile Sensors for Medical Wearables

Zhang

Chen

et al. 2020

Adv Funct Materials

123

106

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“… Production of porous films through freeze-drying [ 137 , 224 , 225 , 226 , 227 , 228 , 229 , 230 ] or using sacrificial templates made of sugar [ 138 , 231 , 232 , 233 , 234 ], salt [ 233 , 234 , 235 , 236 , 237 ], or polystyrene spheres [ 73 , 238 , 239 , 240 ]. The most explored materials in these techniques are PDMS [ 73 , 138 , 231 , 232 , 234 , 235 , 237 , 238 , 240 ], graphene oxide [ 224 , 225 , 226 ], and ecoflex [ 233 , 236 ]. Despite their low-cost, all these techniques also have a limited level of design tailoring.…”

Section: Pressure Sensorsmentioning

confidence: 99%

Transduction Mechanisms, Micro-Structuring Techniques, and Applications of Electronic Skin Pressure Sensors: A Review of Recent Advances

Santos

Fortunato

Martins

et al. 2020

Sensors

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Electronic skin (e-skin), which is an electronic surrogate of human skin, aims to recreate the multifunctionality of skin by using sensing units to detect multiple stimuli, while keeping key features of skin such as low thickness, stretchability, flexibility, and conformability. One of the most important stimuli to be detected is pressure due to its relevance in a plethora of applications, from health monitoring to functional prosthesis, robotics, and human-machine-interfaces (HMI). The performance of these e-skin pressure sensors is tailored, typically through micro-structuring techniques (such as photolithography, unconventional molds, incorporation of naturally micro-structured materials, laser engraving, amongst others) to achieve high sensitivities (commonly above 1 kPa−1), which is mostly relevant for health monitoring applications, or to extend the linearity of the behavior over a larger pressure range (from few Pa to 100 kPa), an important feature for functional prosthesis. Hence, this review intends to give a generalized view over the most relevant highlights in the development and micro-structuring of e-skin pressure sensors, while contributing to update the field with the most recent research. A special emphasis is devoted to the most employed pressure transduction mechanisms, namely capacitance, piezoelectricity, piezoresistivity, and triboelectricity, as well as to materials and novel techniques more recently explored to innovate the field and bring it a step closer to general adoption by society.

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“…Flexible pressure sensors have received tremendous attention due to their potential in monitoring human health [ 1 , 2 , 3 ], human–machine interaction systems [ 4 , 5 ], and intelligent robotics [ 6 , 7 , 8 ]. Thus far, numerous strategies have been proposed to develop pressure sensors with excellent sensing performance based on various sensing mechanisms, including piezoresistive [ 9 , 10 ], capacitive [ 11 , 12 , 13 , 14 ], piezoelectric [ 15 , 16 ], and triboelectric effects [ 17 ]. Among these approaches, a capacitive-type pressure sensor has attracted the most interest owing to its fast response, high reversibility, temperature insensitivity, simple structure and fabrication process, and low power consumption [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, in order to monitor human motions, a pressure sensor needs to be sensitive over a working range up to 100 kPa [ 26 ] to cover the overall tactile pressures. It has been frequently reported that pressure sensors fabricated by the particle–template strategy can work at the low-pressure (0−10 kPa) [ 25 ] and medium-pressure regimes (10−100 kPa) [ 11 , 12 ] and broader ranges (130 kPa [ 26 ], 400 kPa [ 1 ]).…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the design of electrodes of a capacitive pressure sensor has been less considered owing to its less apparent relationships with sensitivity. Electrodes are mainly fabricated by mixing conductive nanomaterials, such as Ag nanowires [ 13 , 19 ], graphene [ 18 ], and carbon nanotubes [ 12 , 30 ], with flexible substrates or polymer matrices [ 21 ]. These nanomaterials are widely known to possess excellent mechanical and electrical properties.…”

Section: Introductionmentioning

confidence: 99%

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Carbonized Cotton Fabric-Based Flexible Capacitive Pressure Sensor Using a Porous Dielectric Layer with Tilted Air Gaps

Kim

2021

Sensors

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Flexible and wearable pressure sensors have attracted significant attention owing to their roles in healthcare monitoring and human–machine interfaces. In this study, we introduce a wide-range, highly sensitive, stable, reversible, and biocompatible pressure sensor based on a porous Ecoflex with tilted air-gap-structured and carbonized cotton fabric (CCF) electrodes. The knitted structure of electrodes demonstrated the effectiveness of the proposed sensor in enhancing the pressure-sensing performance in comparison to a woven structure due to the inherent properties of naturally generated space. In addition, the presence of tilted air gaps in the porous elastomer provided high deformability, thereby significantly improving the sensor sensitivity compared to other dielectric structures that have no or vertical air gaps. The combination of knitted CCF electrodes and the porous dielectric with tilted air gaps achieved a sensitivity of 24.5 × 10−3 kPa−1 at 100 kPa, along with a wide detection range (1 MPa). It is also noteworthy that this novel method is low-cost, facile, scalable, and ecofriendly. Finally, the proposed sensor integrated into a smart glove detected human motions of grasping water cups, thus demonstrating its potential applications in wearable electronics.

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Ultra-highly sensitive, low hysteretic and flexible pressure sensor based on porous MWCNTs/Ecoflex elastomer composites

Cited by 33 publications

References 31 publications

Gelatin Methacryloyl‐Based Tactile Sensors for Medical Wearables

Gelatin Methacryloyl‐Based Tactile Sensors for Medical Wearables

Transduction Mechanisms, Micro-Structuring Techniques, and Applications of Electronic Skin Pressure Sensors: A Review of Recent Advances

Carbonized Cotton Fabric-Based Flexible Capacitive Pressure Sensor Using a Porous Dielectric Layer with Tilted Air Gaps

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