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Tip-Induced In-Plane Ferroelectric Superstructure in Zigzag-Wrinkled BaTiO3 Thin Films
Yuqing Zhou1, Changqing Guo2, Guohua Dong3
1Center for Spintronics and Quantum Systems, State Key Laboratory for Mechanical Behavior of Materials, Department of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Nano Letters
|March 21, 2022
Summary
Researchers created wrinkled barium titanate (BaTiO3) ferroelectric films with a unique "braided" domain pattern. This breakthrough enables precise control over surface charges for advanced bioelectric and physiological applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Micro/nanoscale wrinkled morphologies in elastic polymers offer unique functionalities in various systems.
- Fabricating inorganic ferroelectric thin films with controlled wrinkle structures is challenging.
Purpose of the Study:
- To fabricate inorganic freestanding BaTiO3 ferroelectric thin films with zigzag wrinkle morphology.
- To modulate ferroelectric domains and create an in-plane superstructure with periodic surface charge distribution.
Main Methods:
- Fabrication of inorganic freestanding BaTiO3 ferroelectric thin films.
- Piezoresponse force microscopy (PFM) measurements.
- Phase-field simulation.
Main Results:
- Zigzag wrinkle morphology in BaTiO3 films induces a self-organized strain/stress field.
- This field generates a pristine domain structure that can be switched.
- A robust "braided" in-plane domain pattern and periodic surface potential were achieved.
Conclusions:
- The study presents an effective method for creating microscopic ferroelectric superstructures.
- The unique domain pattern and surface potential offer new possibilities for regulating cells and polar molecules.
- This work advances applications in physiological and bioelectric systems.
