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February 12, 2026CrystalsOpen Access

Enhanced Dielectric Response and Electric Field-Sensing Properties of PDMS Composites by Graphene/Nitride Heterojunctions: Insights from Experiment and DFT

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Experimental insights reveal improved electric field-sensing properties in flexible PDMS composites, indicating potential in power systems.

To investigate the dielectric response and electric field-sensing properties of PDMS composites integrated with graphene/nitride heterojunctions.
Prepared graphene/nitride heterojunction powders using AlN, BN, and Si3N4 and embedded in PDMS
Analyzed the microstructure using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS)
Conducted dielectric spectroscopy across a frequency range of 50 Hz to 50 kHz
Performed density functional theory (DFT) calculations to study the graphene/nitride interface
The induced voltage amplitude under a 50 Hz electric field increased by approximately 7% for G/PDMS and up to 7.45% for nitride composites
Dielectric constant showed typical dispersive behavior and decreased with increased frequency
Stable interface structure confirmed with negative binding energies from DFT calculations
Mulliken charge transfer indicated significant charge redistribution at the heterojunctions

Li et al. (2026) studied this question.

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Experimental insights reveal improved electric field-sensing properties in flexible PDMS composites, indicating potential in power systems.