Fig. 5: Evaluating the piezoelectric performance of PVDF film by extracting the piezoelectric charge transfer from the hybrid output. | Nature Communications

Fig. 5: Evaluating the piezoelectric performance of PVDF film by extracting the piezoelectric charge transfer from the hybrid output.

From: A method for quantitatively separating the piezoelectric component from the as-received “Piezoelectric” signal

Fig. 5

a The electrostatic balance is achieved when the Al plate and the PVDF-based device are contacted. I represent the positive polarization, II represents the negative polarization, \({Q}_{2}\) is the total charge in the Al plate, \(-{Q}_{1}\) is the total charge in the Kapton layer, \(q\) is the charge transfer between electrodes in the positive polarization, \({Q}_{p}\) is the induced piezoelectric charge, \(-q^{\prime}\) is the charge transfer between electrodes in the negative polarization. The transferred charges between electrodes are measured from the b positive and c negative polarization sides of PVDF-based device, and the applied force is 60 N. d The charge–force curves of PVDF-based device are obtained by three methods including outside shielding (OS), compressed balance analysis (CBA), and directly extracting (DE). The effective \({d}_{33}\) of OS is 33.20 pC/N, that of CBA is 33.74 pC/N, and that of DE is 32.64 pC/N. e The piezoelectric charge transfer under different forces is obtained by three methods including OS, CBA, and DE. They are almost equal.

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