Need suggestions on how to control the resonance frequency of PVDF films and fabricate films with very low resonant frequency (in the range 10 - 100 Hz or below).
The answer for your question can be found in the following article:
Xin, Y., Sun, H., Tian, H., Guo, C., Li, X., Wang, S. and Wang, C., 2016. The use of polyvinylidene fluoride (PVDF) films as sensors for vibration measurement: A brief review. Ferroelectrics, 502(1), pp.28-42.