Flexible Capacitive Pressure Sensor with High Sensitivity and Wide Range Based on a Cheetah Leg Structure via 3D Printing

Hong, Weiqiang; Guo, Xiaohui; Zhang, Tianxu; Zhang, Anqi; Yan, Zihao; Zhang, Xinyi; Li, Xianghui; Guan, Yuxin; Liao, Dongzhi; Lu, Haochen; Liu, Hanyu; Hu, Jiangtao; Niu, Yongzheng; Hong, Qi; Zhao, Yunong

doi:10.1021/acsami.3c09841

Cited by 34 publications

(8 citation statements)

References 54 publications

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“…However, this strategy is only effective in the low-pressure range and has a small detection range. In addition, Hong et al designed a capacitive pressure sensor based on the microstructure of biomimetic cheetah legs, verifying the advantages of biomimetic microstructure design and optimizing the structural feature parameters using 3D printing technology. The pressure sensor inspired by the shape of cheetah legs has high sensitivity (0.75 kPa –1 ) and a wide linear sensing range (0–280 kPa).…”

Section: Introductionmentioning

confidence: 98%

A Flexible Capacitive Pressure Sensor with Adjustable Detection Range Based on the Inflatable Dielectric Layer for Human–Computer Interaction

Li,

Chen,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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As an essential component in wearable electronic devices and intelligent robots, flexible pressure sensors have enormous application value in fields such as healthcare, human−computer interaction, and intelligent perception. However, due to the complex and ever-changing pressure loads borne by sensors in different application scenarios, this also puts great demands on the flexible response and adjustment ability of a sensor's detection range. Therefore, developing a flexible pressure sensor with a wide and adjustable detection range, which can be applied flexibly under different pressure loads, is also a major challenge in current research. In this paper, we propose a flexible pressure sensor with a wide and adjustable detection range based on an inflatable adjustable safety airbag as the dielectric layer. This sensor uses inflatable airbags prepared using 3D printing technology and silicone reverse molding technology as the dielectric layer and achieves high sensitivity (0.6 kPa −1 to 1.19 kPa −1 ), wide detection range (220−1500 kPa), and flexible performance applicability by adjusting the air pressure inside the dielectric layer. At the same time, its simple production process, convenient production, fast response time (100 ms), and good stability provide the possibility for the flexible application of sensors in different pressure detection. The experimental results indicate that the sensor has enormous potential for applications in wearable devices, healthcare, human−computer interaction, and intelligent perception recognition.

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Section: Introductionmentioning

confidence: 98%

A Flexible Capacitive Pressure Sensor with Adjustable Detection Range Based on the Inflatable Dielectric Layer for Human–Computer Interaction

Li,

Chen,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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show abstract

“…Recently, many studies have explored wearable electronic devices and electronic skins capable of measuring temperature [1][2][3][4], pressure [5][6][7][8][9], humidity [10][11][12], and strain [13][14][15], and accurately sensing external stimuli, functional devices corresponding to external stimuli are required for signal * Authors to whom any correspondence should be addressed. acquisition, while researchers are developing higher performance sensors for complex real-world application scenarios.…”

Section: Introductionmentioning

confidence: 99%

Simple fabrication of high-sensitivity capacitive tactile sensor based on a polydimethylsiloxane dielectric layer using a biomimetic gray kangaroo leg structure

Hou,

Hong,

Chen

et al. 2024

J. Phys. D: Appl. Phys.

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Design of the capacitive tactile sensor with ultra-high sensitivity and fast response/recovery times is critical to the advancement of wearable devices. However, achieving both fast response/recovery time and ultra-high sensitivity simultaneously is a huge challenge. In this work a simple and easy-to-prepare flexible capacitive tactile sensor is presented, using a biomimetic grey kangaroo structured dielectric layer of polydimethylsiloxane. By using finite element analysis to study the influences of various structures, the test result of the experimentally optimized tactile sensor showed ultra-high sensitivity (1.202 kPa-1), outstanding response and recovery time (60/85 ms), wide pressure range (0-220 kPa), and excellent stability. Finally, the tactile sensors are tested for practical applications, including robot tactile, human motion monitoring, and Morse code detection.

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“…Inspired by human skin, more and more researchers are working to prepare flexible tactile arrays with skin-like functionality to meet the needs of robotic mechanical claw grip state sensing − and have achieved perception capabilities far beyond skin. − Over the past decade, tactile array sensors have been extensively developed by utilizing different sensing mechanisms, such as resistive-, − capacitive-, − and piezoelectric-type mechanisms. − Among them, piezoresistive tactile sensors have become a focus of research due to their high load capacity, low mass production cost, low noise, and high tactile sensitivity. − Recently, advances in various functional materials, − structural designs, ,− fabrication methods, − and signal processing technologies − have further accelerated the development of tactile array sensors, which now enable pressure detection beyond the limits of the skin and ultrawide pressure monitoring ranges. However, some inherent characteristics of array-type tactile sensors limit their application in practical applications.…”

Section: Introductionmentioning

confidence: 99%

Improving the Resolution of Flexible Large-Area Tactile Sensors through Machine-Learning Perception

Zhang,

Zhao,

Zhai

et al. 2024

ACS Appl. Mater. Interfaces

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Industrial robots are the main piece of equipment of intelligent manufacturing, and array-type tactile sensors are considered to be the core devices for their active sensing and understanding of the production environment. A great challenge for existing array-type tactile sensors is the wiring of sensing units in a limited area, the contradiction between a small number of sensing units and high resolution, and the deviation of the overall output pattern due to the difference in the performance of each sensing unit itself. Inspired by the human somatosensory processing hierarchy, we combine tactile sensors with artificial intelligence algorithms to simplify the sensor architecture while achieving tactile resolution capabilities far greater than the number of signal channels. The prepared 8-electrode carbon-based conductive network achieves high-precision identification of 32 regions with 97% classification accuracy assisted by a quadratic discriminant analysis algorithm. Notably, the output of the sensor remains unchanged after 13,000 cycles at 60 kPa, indicating its excellent durability performance. Moreover, the large-area skin-like continuous conductive network is simple to fabricate, cost-effective, and can be easily scaled up/down depending on the application. This work may address the increasing need for simple fabrication, rapid integration, and adaptable geometry tactile sensors for use in industrial robots.

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Flexible Capacitive Pressure Sensor with High Sensitivity and Wide Range Based on a Cheetah Leg Structure via 3D Printing

Cited by 34 publications

References 54 publications

A Flexible Capacitive Pressure Sensor with Adjustable Detection Range Based on the Inflatable Dielectric Layer for Human–Computer Interaction

A Flexible Capacitive Pressure Sensor with Adjustable Detection Range Based on the Inflatable Dielectric Layer for Human–Computer Interaction

Simple fabrication of high-sensitivity capacitive tactile sensor based on a polydimethylsiloxane dielectric layer using a biomimetic gray kangaroo leg structure

Improving the Resolution of Flexible Large-Area Tactile Sensors through Machine-Learning Perception

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