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Improving ferroelectricity and ferromagnetism of PVDF‐CoFe 2 O 4 thick films: Effect of Ethyl acetate and Temperature
Author(s) -
Wang Libo,
Su Yuchang,
Zhang Jing,
Zhang Hongzhi,
Dong Qiaoqiao
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.48345
Subject(s) - ferroelectricity , materials science , ferromagnetism , membrane , solvent , casting , phase (matter) , atmospheric temperature range , polymer chemistry , ethyl acetate , analytical chemistry (journal) , mass fraction , ferromagnetic material properties , chemical engineering , dielectric , composite material , organic chemistry , chemistry , magnetization , condensed matter physics , thermodynamics , magnetic field , physics , biochemistry , quantum mechanics , optoelectronics , engineering
PVDF‐CoFe 2 O 4 (CFO) thick membranes were synthesized by solvent casting method. The mixed organic solvents consist of N‐methyl‐2‐pyrrolidone (NMP) and Ethyl acetate (EA), in which the mass ratios of NMP and EA (NMP:EA = 1:0, 1:1, and 1:2) and the temperature of solvent evaporation (range from 50 to 80 °C) has been considered. The phase structure, β‐PVDF phase content, and electrical and magnetic properties of these membranes were investigated to reveal the effect of EA addition and temperature on these properties. Results manifest that all samples showed coexistence of ferroelectric and ferromagnetic properties at room temperature. EA addition makes film more compact, which may be responsible for the differences in ferromagnetic properties. Adding EA and enhancing temperature resulted in phase transition of PVDF from α and γ to β, which contributed to membranes’ ferroelectric performances. In all samples, NMP:EA = 1:2 treated at 80 °C exhibits the maximum β‐phase fraction and polarization (Pmax) of 87.2% and 2.398 μC cm −2 , respectively. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48345.