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Decoding Apparent Ferroelectricity in Perovskite Nanofibers.

Rajasekaran Ganeshkumar1, Suhas Somnath, Chin Wei Cheah1

  • 1Engineering Product Development, Singapore University of Technology and Design , 487372 Republic of Singapore.

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Summary

Piezoresponse force microscopy (PFM) of ferroelectric potassium niobate nanofibers is complicated by surface roughness. New scanning probe microscopy (SPM) methods clarify PFM signals, enabling accurate characterization of nanoscale ferroelectric materials.

Keywords:
PFMband excitation PFMcKPFMelectrospinningferroelectricitynanofiberspolarization switchingpotassium niobate

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Ferroelectric perovskites are crucial for electronic devices, but nanoscale characterization remains challenging.
  • Piezoresponse force microscopy (PFM) is widely used for studying ferroelectric properties, yet signal interpretation can be complex.
  • Potassium niobate (KNbO3) nanofibers are promising nanostructures for various applications.

Purpose of the Study:

  • To systematically investigate the ferroelectric behavior of electrospun KNbO3 nanofibers using advanced scanning probe microscopy (SPM) techniques.
  • To clarify the origins of PFM signals and address challenges in interpreting hysteresis data for nanoscale ferroelectrics.
  • To explore the influence of environmental factors like relative humidity on ferroelectric properties.

Main Methods:

  • Utilized a suite of SPM techniques, including Band Excitation (BE) SPM and contact mode Kelvin probe force microscopy (cKPFM).
  • Investigated bias-induced charge injection and electrostatic interactions affecting PFM response.
  • Examined the impact of relative humidity on piezoresponse, switching behavior, and tip-induced charges.

Main Results:

  • BE SPM scans demonstrated that PFM signals in KNbO3 nanofibers are primarily influenced by surface roughness affecting resonant frequency, not solely piezoelectric strength.
  • cKPFM revealed insights into charge injection and electrostatic interactions impacting the PFM response.
  • Relative humidity significantly affects the KNbO3 nanofiber's piezoresponse, switching dynamics, and tip-induced charge accumulation.
  • Piezoelectric constants were estimated using BE scan data.

Conclusions:

  • The study provides a clearer understanding of PFM signal interpretation for ferroelectric nanostructures, particularly KNbO3 nanofibers.
  • Accurate characterization of nanoscale ferroelectrics requires careful consideration of surface topography and environmental conditions.
  • These findings offer crucial guidance for researchers studying and utilizing ferroelectric nanomaterials.