Abstract
For more comprehensive monitoring human state of motion, it is necessary to sense multidimensional stimulus information. In this paper, we reported a supersensitive flexible sensor based on Ag/PDMS composites with sensing abilities of strain and force. The fabrication method is simple and rapid, which only need physically grinding the silver particles and mixing with liquid PDMS. The flexible sensor has excellent performances in multidimensional detection. The strain gauge factor can reach as high as 939 when it was stretched to 36%, and the minimum resolution for force detection is 0.02 N. The sensing characteristic of the sensors with different filling fraction and thickness were analyzed from the microscopic point of view. Multidimensional sensing abilities of flexible sensor have greatly expands its applications. We experimentally verified the Ag/PDMS based sensor in human body dynamic monitoring and sound detecting in real-time, which has shown great potential in motion recognition, haptic perception and soft robotics.
Highlights
In recent years, traditional electronic devices have been expanded the range of applications by introducing wearable sensors
The soft glove system used in finger rehabilitation robot needs to simultaneously detect the tactile force of the fingertip and the bending angle of the knuckle, which requires the flexible sensor have both strain and force sensing capacities to monitor of applied force and tension[29,30,31,32]
The flexible sensors have an extremely high tensile sensitivity, whose gauge factor (GF) can reach as high as 939 when it was stretched to 36%
Summary
Traditional electronic devices have been expanded the range of applications by introducing wearable sensors. Chengkuo Lee et al reported various functional sensors based on the triboelectric mechanism; the wearable devices are self-powered and safe, which expand the range of application in outdoor activities[27,28]. Those sensors could only monitor single stimulus, the collection of multidimensional of people’s information surrounding environment has been continuously required. We developed a high sensitive flexible sensor by uniform mixing silver particles and liquid PDMS, capable of detecting applied strain and contact force. The experimental results showed that the resistance change rate of the flexible sensor can reach 300% within the flexibility angle range of the finger, and the minimum sound intensity can be detected was 49.44 dB
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