Abstract:

In order to systematically analyze the effect of design methods and material types of electrospun nanofiber strain sensors on the sensing performance, and further clarify the sensing mechanism thereof, the preparation methods of strain sensors based on carbon nanofibers, polyvinylidene fluoride and polyurethane were described, and the advantages and defects of these strain sensors were compared in terms of gauge factor, strain range, stability, and so on. The research status and development trend of electrospun nanofiber strain sensors in human body movement and health monitoring were introduced. The results indicate that the strain capacity and recovery of the sensor matrix greatly influence the strain range and stability of the sensor. The structure of conductive network formed by the conductive matrix is prone to structural damage during the strain process, and the smaller the initial resistance, the larger the effective strain range of the matrix and the conductive network, and the better the performance of the sensor. The development of electrospun nanofiber strain sensors with high strain range, sensitivity and stability is an important goal in the future.

Key words: electrospinning, nanofiber, strain sensor, carbon nanofiber, polyvinylidene fluoride nanofiber, polyurethane nanofiber