Fig. 2: Characterization of the piezoelectric diaphragm.
From: Hyperpacked piezoelectric-powered capacitive sensor array for high-fidelity vibration detection
a, FT-IR spectra of PVDF-TrFE films fabricated using DMF and PA solvents. b, TrWAXS spectra of unpoled and poled PVDF-TrFE films. c, Measured d31 of unpoled and poled PVDF-TrFE films. d, Comparison of contact stability between the electret film (CYTOP, left) and the piezoelectric film (PVDF-TrFE, right). Stability was evaluated following direct contact with water, artificial sweat and human skin, with measurements taken 2 h after contact removal. The piezoelectric output voltage was measured at 300 Hz under the same vibrational amplitude. Each dot represents the relative surface potential or piezoelectric output voltage from an independent sample, and data are presented as mean ± s.d. (n = 5).
