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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Charge collection kinetics on ferroelectric polymer surface using charge gradient microscopy.

Yoon-Young Choi1, Sheng Tong2, Stephen Ducharme3

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|May 4, 2016
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Summary
This summary is machine-generated.

Charge gradient microscopy (CGM) effectively mapped surface charges on poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] films. Mitigating degradation in this charge collection method could enable efficient energy harvesting with polymer ferroelectrics.

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Area of Science:

  • Materials Science
  • Surface Science
  • Polymer Science

Background:

  • Ferroelectric polymers like poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] exhibit spontaneous surface charges.
  • These charges are crucial for understanding and utilizing their electrical properties in devices.
  • Characterizing these surface charges in ambient conditions is essential for practical applications.

Purpose of the Study:

  • To investigate the use of charge gradient microscopy (CGM) for collecting and mapping surface screening charges on P(VDF-TrFE) thin films.
  • To analyze the factors influencing the collected electric current, such as domain polarity and area.
  • To evaluate the endurance of the charge collection process and identify degradation mechanisms.

Main Methods:

  • Utilized a charge gradient microscopy (CGM) probe to collect surface screening charges on P(VDF-TrFE) thin films.
  • Mapped local electric current originating from collected surface charges on poled ferroelectric domains.
  • Investigated the effect of changing polarity and area of poled domains on current direction and magnitude.

Main Results:

  • CGM successfully mapped surface screening charges on P(VDF-TrFE) films.
  • The direction and amount of collected current were controllable by adjusting domain polarity and area.
  • Charge collection endurance was limited to approximately 20 scan cycles due to degradation.

Conclusions:

  • The degradation in CGM charge collection is attributed to increased bonding between screening and polarization charges.
  • Mitigating this degradation mechanism is key to unlocking the potential of CGM for energy harvesting.
  • CGM shows promise for developing efficient energy harvesting devices utilizing polymer ferroelectrics.