Flexible and Stretchable Capacitive Sensors with Different Microstructures

Qin, Jing; Yin, Li‐Juan; Hao, Yanan; Zhong, Shao‐Long; Zhang, Dongli; Bi, Ke; Zhang, Yongxin; Zhao, Yu; Dang, Zhi‐Min

doi:10.1002/adma.202008267

Cited by 333 publications

(188 citation statements)

References 234 publications

(473 reference statements)

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“…Among the various types of pressure sensors, piezoresistive sensors, which can directly convert the applied pressure into an electrical signal, have attracted tremendous attention because of their simple structure, feasible fabrication, high sensitivity, ability to detect both static and dynamic deformation, and ease of system integration and signal acquisition. [ 20–24 ] It has been demonstrated that the change in contact areas/points of conductive sensing materials under applied pressure significantly determines the electrical properties of the pressure sensing materials. Therefore, in recent years, much effort has been devoted to constructing materials into delicate microstructures with low modulus, enabling them to respond sensitively to subtle pressure stimuli.…”

Section: Introductionmentioning

confidence: 99%

Beyond Skin Pressure Sensing: 3D Printed Laminated Graphene Pressure Sensing Material Combines Extremely Low Detection Limits with Wide Detection Range

Cao

Bai

et al. 2022

Adv Funct Materials

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Artificial intelligence robots predicted in sci-fi movies have attracted increasing attention in recent years, and much effort has been devoted to improving the sensing and manipulation performance of robots. The development of robotic skins capable of handling complex external pressure environments is highly desired for intelligent robots. However, this remains a major challenge due to the lack of pressure sensing materials that can combine extremely low detection limits and wide detection ranges. Inspired by the synergistic strategy of dual mechanoreceptors in human skin, here, the design and 3D printing of laminated graphene pressure sensing materials consisting of both ultrathin-and thick-walled cellular microstructures are demonstrated. Based on such laminated graphene, the piezoresistive pressure sensor achieves a low detection limit of 1 Pa, a wide detection range (1 Pa-400 kPa), and high sensitivities of 3.1 and 0.22 kPa −1 in the pressure regions of 1 Pa-13 kPa and 13−400 kPa, respectively, and the laminated graphenebased skin enables quantitative pressure/weight detection. This laminated graphene can be easily integrated into flexible pressure sensing arrays that enable mapping the spatial distribution of pressure, showing great potential for applications such as electronic skin, physiological signal monitoring, and human-machine interfaces.

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Section: Introductionmentioning

confidence: 99%

Beyond Skin Pressure Sensing: 3D Printed Laminated Graphene Pressure Sensing Material Combines Extremely Low Detection Limits with Wide Detection Range

Cao

Bai

et al. 2022

Adv Funct Materials

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show abstract

“…Flexible sensors can convert external activity (such as mechanical deformation) into directly measurable electrical signals. Depending on their sensory mechanism, they can be divided into resistive [ 27 ], piezoelectric [ 28 ], capacitive [ 29 ], and other types of friction [ 30 ]. When the external pressure changes, the appropriate resistance value, capacitance value, or voltage value of the flexible sensor changes accordingly.…”

Section: Sensory Mechanisms Of Flexible Sensorsmentioning

confidence: 99%

The Progress of Research into Flexible Sensors in the Field of Smart Wearables

Yin

Guo

Hong

et al. 2022

Sensors

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In modern society, technology associated with smart sensors made from flexible materials is rapidly evolving. As a core component in the field of wearable smart devices (or ‘smart wearables’), flexible sensors have the advantages of excellent flexibility, ductility, free folding properties, and more. When choosing materials for the development of sensors, reduced weight, elasticity, and wearer’s convenience are considered as advantages, and are suitable for electronic skin, monitoring of health-related issues, biomedicine, human–computer interactions, and other fields of biotechnology. The idea behind wearable sensory devices is to enable their easy integration into everyday life. This review discusses the concepts of sensory mechanism, detected object, and contact form of flexible sensors, and expounds the preparation materials and their applicability. This is with the purpose of providing a reference for the further development of flexible sensors suitable for wearable devices.

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“…These complex manufacturing processes cause low yields and high costs. In [21], flexible capacitive strain sensors with different microstructures were developed. The different strain microstructures exhibited issues related to stretchability, a complicated manufacturing process, low yields, and high costs.…”

Section: Introductionmentioning

confidence: 99%

Batch Fabrication of a Polydimethylsiloxane Based Stretchable Capacitive Strain Gauge Sensor for Orthopedics

et al. 2022

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Polymer-based capacitive strain gauges are a novel and promising concept for measuring large displacements and strains in various applications. These novel sensors allow for high strain, well above the maximum values achieved with state-of-the-art strain gauges (Typ. 1%). In recent years, a lot of interest in this technology has existed in orthopedics, where the sensors have been used to measure knee laxity caused by a tear of the anterior cruciate ligament (ACL), and for other ligament injuries. The validation of this technology in the field has a very low level of maturity, as no fast, reproducible, and reliable manufacturing process which allows mass production of sensors with low cost exists. For this reason, in this paper, a new approach for the fabrication of polymer-based capacitive strain gauges is proposed, using polydimethylsiloxane (PDMS) as base material. It allows (1) the fast manufacturing of sensor batches with reproducible geometry, (2) includes a fabrication step for embedding rigid electrical contacts on the sensors, and (3) is designed to produce sensor batches in which the size, the number, and the position of the sensors can be adapted to the patient’s anatomy. In the paper, the process repeatability and the robustness of the design are successfully proven. After 1000 large-strain elongation cycles, in the form of accelerated testing caused much higher strains than in the above-mentioned clinical scenario, the sensor’s electrical contacts remained in place and the functionalities were unaltered. Moreover, the prototype of a patient customizable patch, embedding multiple sensors, was produced.

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Flexible and Stretchable Capacitive Sensors with Different Microstructures

Cited by 333 publications

References 234 publications

Beyond Skin Pressure Sensing: 3D Printed Laminated Graphene Pressure Sensing Material Combines Extremely Low Detection Limits with Wide Detection Range

Beyond Skin Pressure Sensing: 3D Printed Laminated Graphene Pressure Sensing Material Combines Extremely Low Detection Limits with Wide Detection Range

The Progress of Research into Flexible Sensors in the Field of Smart Wearables

Batch Fabrication of a Polydimethylsiloxane Based Stretchable Capacitive Strain Gauge Sensor for Orthopedics

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