journal article·2021-08

Passive Particle Jamming Variable Stiffness Material‐Based Flexible Capacitive Stress Sensor with High Sensitivity and Large Measurement Limit

Dongguang Zhang, Xinxin Wang, Yali Wu, Honglie Song, Zhen Ma, Xunying Zhang, Xiaofeng Yang, Ruizhe Xing, Yang Li, Jiayi Yang

Advanced Materials Technologies· Volume 6· Issue 8
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Abstract

Abstract Flexible capacitive stress sensors are important for robotics, human–machine interactions, and electronic skin due to their temperature independence, low power consumption, and high stability. Pressing the soft dielectric material brings the electrodes closer together and thereby increases capacitance. However, the invariance of the elastic modulus of dielectric materials contradicts the sensitivity and measurement limit of capacitive stress sensors. To solve this problem, a passive particle jamming variable stiffness material‐based flexible capacitive stress sensor with high sensitivity, large measurement limit is proposed. Applying small stress does not jam the particles, leading to a low elastic modulus (5.2 kPa). As the stress increases, the particles begin to jam and squeeze the elastic cavity, resulting in a jamming phenomenon that gradually increases the elastic modulus (up to 132.4 kPa). Based on this mechanism, a sensor with high sensitivity (0.023 kPa−1) and large measurement limit (320 kPa) is demonstrated. In addition, several demonstrations prove the potential applications of the sensor.
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Research context

OpenAlex topics: Advanced Sensor and Energy Harvesting Materials · Dielectric materials and actuators · Conducting polymers and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

College of Mechanical and Vehicle Engineering Taiyuan University of Technology Taiyuan 030024 P. R. China

Applied Mechanics Laboratory Department of Engineering Mechanics Tsinghua University Beijing 100084 P. R. China

Shanghai Institute of Space Power‐sources Shanghai 200245 P. R. China

Unmanned System Research Institute Northwestern Polytechnical University Xi'an 710072 P. R. China

Xi'an University of Posts & Telecommunications Xi'an 710121 P. R. China

State Key Laboratory of Chemical Engineering School of Chemical Engineering and Technology Tianjin University Tianjin 300072 P. R. China

Key Laboratory for Wide Bandgap Semi‐Conductor Materials and Devices School of Microelectronics Xidian University Xi'an 710071 P. R. China

College of Computer Science and Technology Xi'an University of Science and Technology Xi'an 710054 P. R. China

Funding

National Natural Science Foundation of China · Natural Science Foundation of Beijing Municipality

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