Related Experiment Video
Updated: Jun 27, 2026

A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
Published on: April 8, 2018
Surface energy-driven perpendicular gradient structure in flexible composite dielectrics for high-temperature
Minhao Yang1,2,3, Huarui Yan4, Shiang Zhao4
1Institute of Energy Power Innovation, North China Electric Power University, Beijing, China. minhao.yang@ncepu.edu.cn.
Abstract:
Flexible dielectrics are urgently needed in advanced electrical systems and modern power electronics. Nevertheless, conventional polymer dielectrics suffer from low discharged energy density and charge-discharge efficiency at elevated temperatures due to severe conduction loss. Here, we report a perpendicular gradient structured polymer composite dielectric with an inorganic hybrid crosslinking network of Si-O-Ti. Driven by surface energy difference, SiO2 accumulates on the film surface to block the charge injection, while bulk TiO2 boosts the dielectric constant. The hybrid crosslinking network of Si-O-Ti also enhances the thermal stability, mechanical modulus and insulation strength by reducing free volume. Ultimately, the obtained composite delivers a discharged energy density of 6.04 J/cm3 above 90% efficiency at 200 °C, exhibiting a 364.62% enhancement over the pristine polymer. This strategy effectively modulates surface and bulk properties, accordingly contributing to improving high-temperature capacitive energy storage performance.
Related Concept Videos
Dielectric Polarization in a Capacitor
Capacitor With A Dielectric
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Electrostatic Boundary Conditions in Dielectrics
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
MOS Capacitor
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
Energy Stored in a Capacitor
Energy Stored in Capacitors
By integrating the equation that relates voltage and current in a capacitor, one can derive an equation for the voltage across the capacitor at any given time. This equation is crucial in understanding and predicting the behavior of capacitors in...

