Tuning-fork-based piezoresponse force microscopy

Area of Science:

• Materials Science
• Nanotechnology
• Physics

Background:

• Piezoresponse force microscopy (PFM) detects picometer-scale surface displacements in piezoelectric materials.
• Conventional PFM methods face challenges in absolute displacement determination due to mechanical and electrostatic side-effects.
• Complex experimental or post-processing steps are often required for accurate piezoelectric coefficient measurements.

Purpose of the Study:

• To develop a PFM method that eliminates electrostatic side-effects for precise measurement of piezoelectric displacements.
• To enable absolute determination of piezoelectric coefficients without complex post-processing.
• To demonstrate the efficacy of a new PFM approach on various ferroelectric materials.

Main Methods:

• Utilizing quartz tuning-fork force sensors in an intermittent contact mode PFM setup.
• Implementing a scanning probe method to map electrically-induced surface displacements.
• Applying a DC electric potential to piezoelectric samples.

Main Results:

• The quartz tuning-fork PFM method successfully measured electrically-induced surface displacements.
• This approach proved immune to electrostatic side-effects common in cantilever-based PFM.
• Reliable piezoeffect mapping was achieved on lithium niobate, triglycine sulfate, and PVDF polymers.
• No influence from the applied DC electric potential was observed on the measurements.

Conclusions:

• Quartz tuning-fork force sensors offer a robust solution for accurate PFM measurements.
• This technique provides a simplified pathway to determine piezoelectric coefficients.
• The method is broadly applicable to diverse ferroelectric materials, enhancing nanoscale electromechanical characterization.