Electrospun PVdF with enhanced piezoelectric behavior

This paper deals with electromechanical response of piezoelectric nanofibrous materials based on PVdF-TrFe co-polymer obtained by means of electrospinning. This technique, providing electrical poling and mechanical stretching during material processing, should increase the beta crystalline phase and thus piezoelectric effect. Two fiber patterns were analyzed, i.e. aligned and random. Experimental results showed that the electric response to mechanical vibrations, in the frequency range from 30 Hz to 200 Hz, is significantly larger for samples with aligned fiber pattern with respect to both commercial films and random fiber specimens. These latters, in fact, show lower beta phase with respect to the aligned-fiber samples.