Abstract
Flexible strain sensors have attracted extensive research all over the world for their great potential applications in wearable electronics, man-machine interaction system, and flexible human health monitoring system. Nevertheless, there still remains some problems such as low stretchability and poor durability. In this study, a highly flexible, stretchable and sensitive strain sensor has been fabricated with a low-cost strategy. The strain sensor was manufactured by graphene-coated polyurethane sponge and packaged by PDMS. The obtained strain sensor could be stretched up to 100% of its original length, showing excellent flexibility and stretchability. In addition, the gauge factor of 2 indicates high sensitivity of the sensor. Besides, the strain sensor exhibited high durability and reliability after 300 stretching-releasing cycles. The facile fabrication process, low-cost materials, and good performance of graphene-sponge based flexible strain sensor shows a good prospect for the application to flexible wearable devices.
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