Flexible Strain Sensors Based on Bionic Parallel Vein-like Structures for Human Motion Monitoring

In recent years, strain sensors have penetrated various fields. The capability of sensors to convert physical signals into electrical signals is of great importance in healthcare. However, it is still challenging to obtain sensors with high sensitivity, large operating range and low cost. In this pa...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2024-01, Vol.24 (2), p.468
Main Authors: Yin, Boshuo, Liu, Furong, Chen, Qingyuan, Liu, Ming, Wang, Feiying
Format: Article
Language:English
Subjects:
Biomimetics
Bionics
Carbon
Composite materials
flexible strain sensors
Graphene
Graphite
human motion
Humans
Microstructure
Morphology
Motion
Movement
Nanowires
Physiology
pressure-sensitive sensors
Sensors
Silicones
stretching
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Summary:In recent years, strain sensors have penetrated various fields. The capability of sensors to convert physical signals into electrical signals is of great importance in healthcare. However, it is still challenging to obtain sensors with high sensitivity, large operating range and low cost. In this paper, a stretchable strain sensor made of a double-layer conductive network, including a biomimetic multilayer graphene-Ecoflex (MLG-Ecoflex) substrate and a multilayer graphene-carbon nanotube (MLG-CNT) composite up-layer was developed. The combined action of the two layers led to an excellent performance with an operating range of up to 580% as well as a high sensitivity (gauge factor (GF ) of 1517.94). In addition, a pressure sensor was further designed using the bionic vein-like structure with a multi-layer stacking of MLG-Ecoflex/MLG-CNT/MLG-Ecoflex to obtain a relatively high deformation along the direction of thickness. The device presented a high sensing performance (up to a sensitivity of 0.344 kPa ) capable of monitoring small movements of the human body such as vocalizations and gestures. The good performance of the sensors together with a simple fabrication procedure (flip-molding) make it of potential use for some applications, for example human health monitoring and other areas of human interaction.
ISSN:1424-8220
1424-8220
DOI:10.3390/s24020468