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Published on: September 19, 2020
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Electro-thermal actuation in percolative ferroelectric polymer nanocomposites
Yang Liu1,2, Yao Zhou3, Hancheng Qin4
1State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, China. yliu1319@hust.edu.cn.
Nature Materials
|May 25, 2023
Summary
Ferroelectric polymer nanocomposites achieve high strain (>8%) and energy density (11.3 J cm⁻³) via electro-thermal phase transitions. This breakthrough enables advanced soft actuators, surpassing conventional piezoelectric materials.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Ferroelectric materials interconvert electrical and mechanical energy, crucial for transducers, actuators, and sensors.
- Ferroelectric polymers offer giant electric-field-induced strain (>4.0%), exceeding piezoelectric ceramics and crystals.
- However, their low normalized elastic energy densities limit practical applications in soft actuators.
Purpose of the Study:
- To develop high-performance ferroelectric actuators using novel polymer nanocomposites.
- To overcome the limitations of conventional piezoelectric polymer composites regarding strain and energy density.
Main Methods:
- Utilized percolative ferroelectric polymer nanocomposites.
- Employed electro-thermally induced ferroelectric phase transitions.
- Investigated electric-field-driven actuation performance.
Main Results:
- Achieved a strain exceeding 8% in the composite material.
- Demonstrated an output mechanical energy density of 11.3 J cm⁻³ at 40 MV m⁻¹.
- Outperformed benchmark relaxor single-crystal ferroelectrics in actuation performance.
Conclusions:
- The electro-thermal phase transition approach in ferroelectric polymer nanocomposites enables high strain and energy density.
- This method overcomes the modulus-strain trade-off in conventional piezoelectric polymer composites.
- Opens new avenues for developing high-performance soft ferroelectric actuators.
