| 초록 |
Vibrations, particularly those in the low-frequency range of 3 to 300 Hz, not only disrupt the process's consistent control but also cause disease in industrial employees. Although the vibration sensor is critical for research, to the best of our knowledge, there has been no report on the vibration sensor made by aligned nanofiber for low-frequency vibrations. Aligned piezoelectric nanofibers demonstrated superior conversion capabilities when mechanical force was converted to electrical energy. In our research, electrospinning was employed to prepare an aligned nanofiber using polyvinylidene fluoride (PVDF) as a piezoelectric polymer. Then heat annealing treatment of PVDF nanofiber was carried out in order to enhance the piezoelectricity of PVDF nanofibers. Finally, vibration sensor was prepared by attaching two copper electrodes on each side of heat-treated PVDF nanofiber. This sensor device was capable of detecting vibrations in the low-frequency region with a sensitivity of around 234 mV/N. It was capable of detecting multiple frequencies of vibration. Additionally, detecting performace of our sensor was matained after 1,500-cycle repetitions without any noticeable change. |
