Table 4.

Piezoelectric coefficient evaluated by averaging the PFM signal over 4 areas with dimensions of 20 $\times$ 20 μm in comparison with other published results.

Current Study		Literature Overview
Sample	|d33eff|, pm/V	Sample	|d33eff|, pm/V (pC/N)
[PVDF]impr	64	Corona poled β-phase PVDF film [51]	28
[PVDF]q	86	Drawn PVDF film (stretching ratio = 5) [44]	34
[PVDF_0.1rGO]q	87	Poled PVDF film (E = 400 kV/cm) [50]	17.5
[PVDF_0.1rGO]p	75	Quenched at −20 °C PVDF film [16]	49.6
[PVDF_0.4rGO]q	79	γ-phase PVDF single nanoribbon [52]	58.5
[PVDF_0.4rGO]p	66	Simulated data for P(VDF-TrFE)/GO composite [53]	29.8