An additive, 1,4-butadiene sulfone (BDS), which generates H2SO3 by in situ thermal retro-Diels-Alder decompositions, is used for preparing high β-phase polyvinylidene fluoride (PVDF) films. Because of preferential multiple non-covalent interactions of H2SO3 with all-trans configuration of PVDF, β-phase PVDF is spontaneously induced without mechanical drawing and/or extensive thermal annealing process. PVDF films cast from PVDF/BDS/water solutions exhibit high β-phase content (fβ = 95%) when the BDS concentration is only cBDS = 1.0 wt%, which is confirmed by polarized optical microscopy (POM), SEM, Fourier transform infrared spectroscopy (FT-IR), differential scan calorimetry (DSC), and 2D grazing incidence wide-angle X-ray scattering (GIWAXS). Because of the high β-phase content, PVDF films prepared by using BDS exhibit excellent ferroelectric and piezoelectric properties (Ec = 50 MV/m, Pr = 5 µC/cm2, and d33 = ≈-25 pm/V). Furthermore, a triboelectric nanogenerator (TENG) developed with high β-phase PVDF film exhibits enhanced performance as 2.5 times higher than neat PVDF film in output charge density, allowing reliable operation of conventional electronic devices.
|Journal||Advanced Electronic Materials|
|Publication status||Published - 2023 Jan|
Bibliographical noteFunding Information:
J.C., K.L., and M.L. contributed equally to this work. This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (2020R1A2C2100802). X‐ray experiments were conducted at 9A beamlines at Pohang Accelerator Laboratory (PAL), Korea. J.C., S.E., and J.H. conducted experiments including POM, FT‐IR, DSC, and X‐ray measurements. M.L. conducted theoretical calculations. K.L. and T.K. assisted PFM, MFM, and TENG experiments. W.B.L., Y.K., and C.P helped to analyze the data and revise the manuscript. Y.K. conceived and supervised the project.
© 2022 The Authors. Advanced Electronic Materials published by Wiley-VCH GmbH.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials