Voltage-induced infrared absorption from a spin-cast thin film of ferroelectric poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE))

Kenji Takashima*, Yukio Furukawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Voltage-induced infrared spectra of annealed spin-cast thin films of ferroelectric poly(vinylidene fluoride-cotrifluoroethylene) (P(VDF-TrFE)) (molar ratio, 3:1) were measured in a stepwise cyclic external electric field. Most of the observed infrared bands originated from the β ferroelectric crystalline phase. The voltage-induced spectral changes were decomposed into zeroth- (original), first-, and second-derivative spectra, and were attributed to the rotational motions of the polymer chains and the vibrational Stark effect. The values of the original spectral absorbance change ratios, ΔA/A, for the 849-cm -1 band (CF 2 symmetric stretching, a 1 ) and the 884-cm -1 band (CH 2 rocking, b 2 ) of the film exhibited double minimum and maximum peak hysteresis loops, respectively. The intensity of each band increased or decreased suddenly near a coercive field of ±0.6 MV/cm. These sudden intensity changes were attributed to the rotational inversion of the polymer chains that are associated with ferroelectricity.

Original languageEnglish
Pages (from-to)59-64
Number of pages6
JournalAnalytical Sciences
Volume33
Issue number1
DOIs
Publication statusPublished - 2017

Keywords

  • Ferroelectricity
  • Infrared spectroscopy
  • Poly(vinylidene fluoride-co-trifluoroethylene)
  • Thin film

ASJC Scopus subject areas

  • Analytical Chemistry

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