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Open AccessArticle

A Wrinkled Ag/CNTs-PDMS Composite Film for a High-Performance Flexible Sensor and Its Applications in Human-Body Single Monitoring

1
Shenzhen Research Institute, Wuhan University, Shenzhen 518057, China
2
School of Physics and Technology, and MOE Key Laboratory of Artificial Micro- and Nano-Structures, Wuhan University, Wuhan 430072, China
3
School of Electronic and Computer Engineering, Peking University, Shenzhen 518005, China
4
Center for Theoretical Physics, Wuhan University, Wuhan 430072, China
5
Mechanical and Electrical Engineering College, Shenzhen Institute of Information Technology, Shenzhen 518172, China
6
Center for Electron Microscopy, Wuhan University, Wuhan 430072, China
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(6), 850; https://doi.org/10.3390/nano9060850
Received: 6 May 2019 / Revised: 26 May 2019 / Accepted: 27 May 2019 / Published: 3 June 2019
In this paper, a flexible Ag/CNTs-PDMS (polydimethylsi-loxane) composite film sensor based on the novel design philosophy was prepared. Its force-electric effect mechanism is based on the generation of micro-cracks in the Ag film during external forcing, leading to resistance variation. Experimental results find that Ag film thickness has a strong influence on the sensor’s sensitivity, which exhibits a tendency of first increasing and then decreasing the Ag film thickness, and also has an optimal thickness of 4.9 μm for the maximum sensitivity around 30. The sensitive mechanism can be theoretically explained by using the quantum tunneling effect. Due to the use of the wrinkled carbon nanotubes (CNTs) film, this sensor has advantages, such as high sensitivity, large strain range, good stability and durability, cheap price, and suitability for large-scale production. Preliminary applications on human-body monitoring reveal that the sensor can detect weak tremors and breathe depth and rate, and the corresponding heartbeat response. It provides possibilities to diagnose early Parkinson’s disease and exploit an early warning system for sudden infant death syndrome and sleep apnea in adults. In addition, as a force-electric effect sensor, it is expected to have broad application areas, such as a man-machine cooperation, and a robotic system. View Full-Text
Keywords: sensor; CNTs; Ag film; force-electric effect; human health monitoring sensor; CNTs; Ag film; force-electric effect; human health monitoring
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Yang, Y.; Luo, C.; Jia, J.; Sun, Y.; Fu, Q.; Pan, C. A Wrinkled Ag/CNTs-PDMS Composite Film for a High-Performance Flexible Sensor and Its Applications in Human-Body Single Monitoring. Nanomaterials 2019, 9, 850.

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