Bioinspired Crocodile Skin-based Flexible Piezoelectric Sensor for Three-dimensional Force Detection

The demand for flexible pressure sensors is increasing with the rapid development of wearable smart devices, dexterous manipulators, and human-machine application interfaces. Despite the development of flexible sensors capable of effectively sensing multidimensional forces, the challenge of directly...

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Bibliographic Details
Published in:IEEE sensors journal 2023-09, Vol.23 (18), p.1-1
Main Authors: Zhang, Chunyan, Zhang, Rui, Ji, Chao, Pei, Zhen, Fu, Zhiyuan, Liu, Yan, Sang, Shengbo, Hao, Runfang, Zhang, Qiang
Format: Article
Language:English
Subjects:
3D force detection
Barium titanates
bionic
Crocodiles
Difluorides
Directional sensitivity
Elastomers
flexible
Flexible components
Force
piezoelectric effect
Piezoelectricity
Polyvinylidene fluorides
Pressure sensors
Robot sensing systems
Sensitivity
Sensors
Shear forces
Voltage measurement
Wearable sensors
Wearable technology
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Summary:The demand for flexible pressure sensors is increasing with the rapid development of wearable smart devices, dexterous manipulators, and human-machine application interfaces. Despite the development of flexible sensors capable of effectively sensing multidimensional forces, the challenge of directly restoring information from objects in contact remains significant. Inspired by the tactile sensory organ of crocodile skin, this study reports a three-dimensional force sensing sensor, mainly composed of barium titanate Polyvinylidene difluoride and silicone, to form a piezoelectric elastomer layer. Under normal and shear loads, the sensing mechanism relies on the change in output voltage between the semi-spherical electrodes and the piezo elastomer. An interlocking structure detects different directions of shear force. The sensor exhibits excellent directional resolution, with a normal force sensitivity of 20.42±2mvN -1 in the pressure range of 0.1N-1.5N, and directional sensing sensitivity of 4.40mvN -1 , 5.29 mVN -1 , 4.44 mVN -1 , and 4.84mVN -1 for the four faces, respectively. The sensor also exhibits high linearity. Further demonstrations included testing the sensor in molds over various rough surfaces. The sensor provided timely feedback to distinguish between different surface roughnesses and force directions-expected to be a self-powered wearable device for future human-computer interaction or personalized identification applications.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2023.3301014