Strain sensor for full-scale motion monitoring based on self-assembled PDMS/MWCNTs layers

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Abstract
The combination of strain sensors and wearable devices is an important topic in the field of human–machine interface. We describe a stretchable, flexible, ultrasensitive, simple and low-cost strain sensor based on the PDMS/MWCNTs/PDMS sandwich structure. The sensitive film was prepared by the layer-by-layer self-assembly method. The sensor exhibited the stable mechanical properties in the high measurement range (0.1%–75%) with the gauge factor more than 100. We demonstrate a proof of concept to detect the full-scale change of the human motions, including large movements of human limbs and subtle deformations on human skin. Moreover, the sensor was attached to the throat and face to monitor the human expression during speaking, crying, smiling and swallowing. Due to its excellent characteristics, it could open up a new way for the development of the next generation of high-tech applications, like intelligent devices, wearable electronics and human–machine interface systems.
Funding Information
  • National Natural Science Foundation of China (61574086, 61871281)
  • Tai’shan Scholar Engineering Construction Fund of Shandong Province of China and the Key Laboratory for Robot and Intelligent Technology of Shandong Province (KLRIT2018003)

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