Flexible Pressure Sensors Based on Bionic Microstructures: From Plants to Animals

Tan, Yuewu; Xuehong, Liu; Tang, Wei; Chen, Jing; Zhu, Zheng; Li, Lin; Zhou, Nian; Kang, Xiaoyang; Xu, D.‐X.; Wang, Lei; Wang, Guixue; Tan, Hui; Li, Hui

doi:10.1002/admi.202101312

Cited by 46 publications

(36 citation statements)

References 123 publications

(288 reference statements)

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“…To address the balance between linear sensing range and sensitivity, goal-directed design strategies, such as unique microstructures and the use of highly compressive elastic materials, have been used to expand the sensing range of tactile sensors for practical applications and sensitivity. Specifically, bionic structures, ,− pyramids, − hemispheres, − and micropillars − of the sensor microstructure have been developed to demonstrate that the microstructures are beneficial for improving sensor performance. The suction cup structure used in the medium layer of the sensor is based on an octopus suction cup, which has excellent adhesion and elasticity. − The air inside the suction cup gradually increases the difficulty under compression, resulting in an increase in the sensor range.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive and Wide-Range Flexible Bionic Tactile Sensors Inspired by the Octopus Sucker Structure

Guo

Hong

Liu

et al. 2022

ACS Appl. Nano Mater.

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Recently, flexible tactile sensors have been widely concerned in many fields, including healthcare monitoring devices and wearable electronics. However, the fabrication of capacitive bionic tactile sensors with a wide linear sensing range and high sensitivity is a major difficulty. A flexible bionic sensor based on the octopus sucker microstructure that improves sensing performance by constructing a biomimetic body with a good microstructure was proposed in this study. The effect of the characteristic parameters of the sensor structure on the sensitivity is studied by simulations and experiments, and the sensor structure is optimized. Experimental results demonstrate that the proposed octopus-inspired tactile sensor has a high sensitivity of 0.636 kPa −1 and a wide linear sensing range (8 Pa-500 kPa). Moreover, the tactile sensor has a rapid response time (∼40 ms), excellent repeatability, and outstanding durability (>6000 cycles), making it a reliable platform for monitoring human movements and bionic manipulator grasping objects. This study provides bionic tactile sensors with significant potential for innovative applications in future intelligent robotics and electronic skins.

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Section: Introductionmentioning

confidence: 99%

Highly Sensitive and Wide-Range Flexible Bionic Tactile Sensors Inspired by the Octopus Sucker Structure

Guo

Hong

Liu

et al. 2022

ACS Appl. Nano Mater.

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“…21 However, because these sensors are difficult to fabricate and have a limited pressure detection range, their large-scale fabrication and practical application are limited. 22 Therefore, the development of flexible pressure sensors with excellent sensitivity, large detection range, and low cost remains a challenge.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, piezoresistive flexible pressure sensors are considered as ideal candidates for next-generation sensors due to their advantages of simple fabrication, easy signal reading, low energy consumption, and excellent static pressure detection capability. , To improve sensitivity, various sensor microstructures are designed and reported, such as pyramids, domes pillars, and fibers . However, because these sensors are difficult to fabricate and have a limited pressure detection range, their large-scale fabrication and practical application are limited . Therefore, the development of flexible pressure sensors with excellent sensitivity, large detection range, and low cost remains a challenge.…”

Section: Introductionmentioning

confidence: 99%

Flexible Pressure Sensors Based on Molybdenum Disulfide/Hydroxyethyl Cellulose/Polyurethane Sponge for Motion Detection and Speech Recognition Using Machine Learning

Chen

Zhang

Luan

et al. 2022

ACS Appl. Mater. Interfaces

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Flexible pressure sensors with excellent performance have broad application potential in wearable devices, motion monitoring, and human−computer interaction. In this paper, a flexible pressure sensor with a porous structure is proposed by coating molybdenum disulfide (MoS 2 ) and hydroxyethyl cellulose (HEC) on a polyurethane (PU) sponge skeleton. The obtained sensor has excellent sensitivity (0.746 kPa −1 ), a wide detection range (250 kPa), fast response (120 ms), and outstanding repeatability over 2000 cycles. It is proven that the sensor can realize human motion detection and distinguish the touch of varying strength. In addition, a pressure sensing array was fabricated to reflect the pressure distribution and recognize the writing of Arabic numerals. Finally, the sensor performs speech detection through throat muscle movements, and high-accuracy (97.14%) speech recognition for seven words was achieved by a machine learning algorithm based on the support vector machine (SVM). This work provides an opportunity to fabricate simple flexible pressure sensors with potential applications in next-generation electronic skin, health detection, and intelligent robotics.

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“…Compared with a rigid pressure sensor, a flexible pressure sensor is more suitable for medical monitoring, human–computer interaction, wearable electronics, and soft robotics owing to its unique bendability and flexibility. − The piezoresistive sensor has a wide application prospect in flexible electronics owing to its uncomplicated structure and convenient signal reading. High sensitivity, wide range, and simple manufacturing process are very important for flexible piezoresistive sensors.…”

Section: Introductionmentioning

confidence: 99%

High-Performance Porous PDMS-Based Piezoresistive Sensor Prepared by a Modified Microwave Irradiation Process

Zhao

Xiao

et al. 2022

ACS Appl. Electron. Mater.

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The flexible pressure sensor based on a porous structure has excellent sensing performance. It is critical to develop a large-scale and lowcost manufacturing method for realizing high-performance flexible sensors with porous structures. Herein, a porous polydimethylsiloxane (PDMS) was prepared by a modified microwave irradiation process, and an ultrahigh sensitive flexible piezoresistive sensor with wide sensing range was obtained by coating carbon nanotubes (CNTs)/graphene on the porous PDMS surface. Due to the uniform macroporous structure in PDMS and the synergistic conductive effect of graphene and CNTs, the sensitivity of the flexible sensor is up to 300.31 kPa −1 in 0−50 kPa and 52.51 kPa −1 in 50−200 kPa. Moreover, the flexible device has good reversibility, rapid response speed, good stability, and a certain anti-electromagnetic interference ability. The application in the monitoring of physiological signals demonstrates that the porous PDMS-based sensor prepared by the convenient and environmental microwave irradiation process has remarkable ability in monitoring human health. In addition, the modified microwave irradiation method also provides a way for the preparation of porous materials for other applications such as electromagnetic shielding materials.

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Flexible Pressure Sensors Based on Bionic Microstructures: From Plants to Animals

Cited by 46 publications

References 123 publications

Highly Sensitive and Wide-Range Flexible Bionic Tactile Sensors Inspired by the Octopus Sucker Structure

Highly Sensitive and Wide-Range Flexible Bionic Tactile Sensors Inspired by the Octopus Sucker Structure

Flexible Pressure Sensors Based on Molybdenum Disulfide/Hydroxyethyl Cellulose/Polyurethane Sponge for Motion Detection and Speech Recognition Using Machine Learning

High-Performance Porous PDMS-Based Piezoresistive Sensor Prepared by a Modified Microwave Irradiation Process

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