Highly stable pressure sensor based on carbonized melamine sponge using fully wrapped conductive path for flexible electronic skin

Liu, Caixia; Zhu, Wenjin; Li, Mengdi; Sun, Xuehu; Guo, Xiaohui; Liu, Jian; Liu, Ping; Zhang, Yangyang; Huang, Ying

doi:10.1016/j.orgel.2019.105447

Cited by 43 publications

(18 citation statements)

References 31 publications

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“…A comparison of the sensing performances of the PAPC- x based piezoresistive sensors is shown in Table S1. Such a sensitivity variation is typical for flexible piezoresistive sensors based on porous materials. , Figure c and Table S2 compare the sensing performances of the PAPC-based flexible piezoresistive sensor with other porous-based piezoresistive sensors reported in the previous literature, demonstrating the higher sensitivity and broader sensing range for the PAPC-based sensor simultaneously. ,− …”

Section: Resultsmentioning

confidence: 68%

Porous AgNWs/Poly(vinylidene fluoride) Composite-Based Flexible Piezoresistive Sensor with High Sensitivity and Wide Pressure Ranges

Jing

Zhou

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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Flexible piezoresistive sensors are highly desirable for tactile sensing and wearable electronics. However, the reported flexible piezoresistive sensors have the inherent trade-off effect between high sensitivity and wide pressure ranges. Herein, we report a flexible piezoresistive sensor with a three-dimensional (3D) porous microstructured sensing layer composed of silver nanowires (AgNWs) and a poly(vinylidene fluoride) (PVDF) matrix, exhibiting high sensitivity and wide pressure ranges. Benefiting from the conductive networks of AgNWs and the 3D porous structure of PVDF, the porous AgNWs/PVDF composite (PAPC)-based flexible piezoresistive sensor exhibits high sensitivities of 0.014 and 0.009 kPa–1 in the wide pressure ranges of 0–30 and 30–100 kPa, respectively. In addition, the fabricated sensor also shows a fast response time of 64 ms, a low detection limit of 25 Pa, and long-term durability over 10,000 continuous cycles. The PAPC-based flexible piezoresistive sensor can accurately monitor various human physiological activities (ranging from subtle deformations to vigorous body movements) by quantitatively measuring the tactile sensation on human skin. This work indicates that the proposed sensor can be potentially applicable to mobile healthcare monitoring devices as well as next-generation wearable electronics.

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Section: Resultsmentioning

confidence: 68%

Porous AgNWs/Poly(vinylidene fluoride) Composite-Based Flexible Piezoresistive Sensor with High Sensitivity and Wide Pressure Ranges

Jing

Zhou

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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“…These flexible pressure sensors have a reliable stability 10 000 cycles and stable signal waveform output, and a sensitivity value of 6.35 Â 10 À3 kPa À1 (Figure 2f ). [61] The supporting materials can considerably influence the flexible pressure sensors' performance. The numerous kinds of supporting materials for flexible pressure sensors have been investigated.…”

Section: Active Materialsmentioning

confidence: 99%

“…These ﬂexible pressure sensors have a reliable stability 10 000 cycles and stable signal waveform output, and a sensitivity value of 6.35 × 10 −3 kPa −1 (Figure 2f). [ 61 ]…”

Section: Piezoresistive Pressure Sensors Based On E‐skinmentioning

confidence: 99%

Recent Progress in Flexible Pressure Sensors Based Electronic Skin

2021

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In recent years, implantable electronics, electronic skin (e-skin), and flexible wearable devices have been developed due to their extensive applications in health monitoring, intelligent robots, and human disease treatment. Tactile sensors are the keys necessary to build skin-inspired electronics. This article reviews the latest progress of e-skin-based flexible pressure sensors, such as piezoresistivity, capacitance, triboelectricity, and piezoelectricity from 2018 up to now. The working principles, structure design, active materials, and performance of numerous flexible pressure sensors are covered in detail. Finally, insights are provided and challenges and future perspectives of flexible pressure sensors in practical applications are discussed.

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“…The sensitivity of the composite with woodpile structure is calculated to be 15.04 MPa −1 at the pressures under 64.44 kPa, higher than the solid counterpart (Figure 2e), and comparable to the performances of other reported pressure sensors listed in Table S2, Supporting Information. [63][64][65][66][67][68][69][70] The enhanced performance of the composite with woodpile-structure could be ascribed to the existence of air cavities. First, the woodpile-structure has two conductive paths on the cross section at the original state, as shown in Figure 2i.…”

Section: Characterization and Performance Study Of The Mwcnt/ea Compo...mentioning

confidence: 99%

All Digital Light Processing‐3D Printing of Flexible Sensor

Xiao

Yang

et al. 2022

Adv Materials Technologies

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conductivity and immunity to deformations, as well as a robust interface between them for long-term usage. In addition, a facile, cost-effective, and eco-friendly fabrication method is highly desirable for the whole flexible sensor.Among a variety of fabrication methods reported so far, lithography, [16][17][18][19] screen printing, [20][21][22][23][24] inkjet printing, [25][26][27][28][29] and electroless deposition, [30,31] are widely used in flexible sensor fabrication. However these 2D fabrication methods only can fabricate flexible sensor on a flat plane. 3D printing, also called additive manufacturing, provides a rapid prototyping strategy for industrial design, architecture, aerospace, dental and medical industries, and other fields. [32] Due to the ability to fabricate components and structures rapidly, cost-efficiently, and environmentally, in recent years, 3D printing has been explored for the fabrication of flexible sensor for electronics. [33] Up to now, 3D printing technologies used in the fabrication of flexible sensor include fused deposition modeling (FDM), [34][35][36][37][38] direct ink writing (DIW), [39][40][41] and digital light processing (DLP). [42][43][44][45] Li et al. developed a FDM-3D printed flexible strain sensor based on carbon black/thermoplastic polyurethane, and periodic configurations were designed to improve the flexibility of sensing unit. [46] Hensleigh and coworkers fabricated a flexible 3D capacitive sensor based on multi-material DIW-3D printing, which can be integrated into prosthetic and soft robotic. [47] Despite of these successful studies, extrusion-based 3D printing techniques typically suffer from limited raw materials, easy clogging of the needles, and nonuniformity of the printed layers. [48] The stereolithography-based 3D printing technique, DLP-3D printing, relying on layer-by-layer curing of photocurable resin, has high resolution, simple process, and fast forming speed. Technically, DLP 3D printing of flexible sensor can be divided into two routes. The first one is to 3D printing of molds or substrates, then active components are filled into the molds or deposited on the substrates to form flexible sensors. For instance, Wu's group report a flexible pressure sensor with porous structure used DLP-3D printed hydrolysable scaffold as sacrificial mold which need to be dissolved to create the porous structure for sensing unit after curing the conductive polymer composites. [49] Xia and coworkers fabricated a flexible pressure sensor by 3D-printing of microstructured substrate with gold film spray-coated on it. [50] The second route for DLP-3D Flexible sensor with high sensitivity, high durability, and facile fabrication process has promising applications in structural health monitoring, humanmachine interface, and soft robotics areas. Digital light processing-3D (DLP-3D) printing can print flexible sensor in a scalable process. However, to achieve all DLP-3D printing of flexible sensor, there still exist challenges of how to print sensing units with high sensitivit...

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Highly stable pressure sensor based on carbonized melamine sponge using fully wrapped conductive path for flexible electronic skin

Cited by 43 publications

References 31 publications

Porous AgNWs/Poly(vinylidene fluoride) Composite-Based Flexible Piezoresistive Sensor with High Sensitivity and Wide Pressure Ranges

Porous AgNWs/Poly(vinylidene fluoride) Composite-Based Flexible Piezoresistive Sensor with High Sensitivity and Wide Pressure Ranges

Recent Progress in Flexible Pressure Sensors Based Electronic Skin

All Digital Light Processing‐3D Printing of Flexible Sensor

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