Characteristic of single-fiber PVDF nanoharvester via new hollow cylindrical near-field electrospining process

This study presented the NFES on the glass tube process to fabricate permanent piezoelectricity of PVDF piezoelectric nanofibers. Under high in-situ electric poling and strong mechanical stretching effect during the NFES on the glass tube process, large PVDF nanofiber array with high piezoelectric β-phase crystallisation was demonstrated. A single PVDF fiber under a repeated mechanical straining test, peak voltage of -45 mV has been collected with a peak current of -3.9 nA. With the same internal resistance of the single-fiber PVDF nanoharvester, a load resistor of 6.8 MΩ was selected. The maximum load voltage of 11.2 mV and the maximum power of 18.45 pW/cm² were obtained, respectively. These pre-strained piezoelectric PVDF nanofibers fabricated by the NFES on the glass tube with high process flexibility at low cost, availability in ultra-long lengths, various thicknesses and shapes can be applied at power scavenge, sensing and actuation.