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Yangjiang Wu1,2,3, Xiaohui Li1,2,3, Alain M Jonas4

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Hierarchical structures in ferroelectric polymers influence polarization switching. Anisotropic films show unique domain behavior, suggesting domain wall motion and amorphous phase interactions control reversal dynamics.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Condensed Matter Physics

Background:

  • Ferroelectric polymers like poly(vinylidene fluoride-ran-trifluoroethylene) exhibit unique polarization switching behaviors.
  • Understanding the relationship between nanoscale structure and ferroelectric properties is crucial for device applications.

Purpose of the Study:

  • To investigate the correlation between hierarchical structures and polarization switching in ferroelectric poly(vinylidene fluoride-ran-trifluoroethylene) (PVDF-TrFE).
  • To differentiate the switching mechanisms in homogeneous versus anisotropic PVDF-TrFE thin films.

Main Methods:

  • Transmission Electron Microscopy (TEM) for structural analysis.
  • Piezoresponse Force Microscopy (PFM) for probing ferroelectric domain dynamics.
  • Comparative analysis of homogeneous and anisotropic thin films.

Main Results:

  • Anisotropic PVDF-TrFE films with oriented lamellae exhibit quadrangular domain shapes and double hysteresis loops.
  • Polarization switching in lamellae is primarily driven by domain wall motion.
  • Amorphous inter-lamellar regions hinder complete polarization switching.
  • Lamellar coupling is governed by a creep process.

Conclusions:

  • The proposed model explains previously reported contradictory polarization reversal dynamics.
  • Tailoring ferroelectric polymer nanostructures offers a pathway to control domain reversal speed.
  • Insights gained can guide the design of advanced ferroelectric polymer materials.