Broad-Temperature Electrocaloric Effect in Multilayered Ferroelectric Polymer Nanocomposites.

Area of Science:

• Materials Science
• Solid-State Physics
• Nanotechnology

Background:

• The electrocaloric effect (ECE) is a promising solid-state cooling technology for electronic devices.
• Developing ferroelectric materials with high ECE at elevated temperatures is a key challenge for practical applications.

Purpose of the Study:

• To engineer multilayered ferroelectric polymer composites with enhanced ECE performance across a broad temperature range.
• To investigate the influence of nanofiller dispersion and electric field distribution on ECE properties.

Main Methods:

• Fabrication of multilayered ferroelectric polymer composites with controlled ferroelectric ceramic nanofiller dispersion.
• Phase-field modeling to understand and optimize electric field distribution and polarization behavior.
• Introduction of [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) to suppress electrical conduction.

Main Results:

• Achieved a giant electrocaloric effect with an adiabatic temperature change (ΔT) of 25.3 K and entropy change (ΔS) of 0.25 J cm⁻³ K⁻¹ at room temperature.
• Demonstrated ΔT > 20 K and ΔS > 0.18 J cm⁻³ K⁻¹ over a wide temperature range (0-80 °C).
• Successfully suppressed electrical conduction through PCBM incorporation.

Conclusions:

• The developed multilayered ferroelectric nanocomposites offer a viable strategy for high-performance electrocaloric materials.
• These materials show significant potential for advanced thermal management in microelectronic systems.
• The design approach provides a pathway for tailoring ECE properties in functional composites.