Multi-Field Synergy for Orchestrating Filler Angles in Polyimide Aerogels with Switchable Electromagnetic...

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetism

Background:

• The IT sector requires advanced electromagnetic interference (EMI) shielding materials with real-time responsiveness.
• Current mechanical strain-based methods for dynamic EMI shielding have limitations in tuning range and stability.

Purpose of the Study:

• To develop intelligent EMI shielding materials with wide-range, reversible tuning capabilities.
• To address the limitations of existing EMI shielding technologies through a novel synergistic regulation strategy.

Main Methods:

• Utilized synergistic electric/magnetic field regulation to control the alignment of reduced graphene oxide (rGO) and nickel nanowires (NiNWs).
• Fabricated 3D ordered rGO@NiNWs/polyimide aerogels with tunable network structures.
• Investigated EMI shielding performance across gigahertz and terahertz bands using physical rotation for tuning.

Main Results:

• Achieved reversible, wide-range tuning of EMI shielding performance via physical rotation, enabling "on/off" switching.
• Demonstrated excellent ultra-wideband EMI shielding with an average of 85 dB in the terahertz band at 80 wt.% rGO@NiNWs and 90° inter-phase angle.
• Confirmed material stability in extreme environments and elucidated the shielding mechanism through finite element simulations.

Conclusions:

• The proposed electric/magnetic field synergistic regulation strategy enables precise control over material architecture for intelligent EMI shielding.
• The developed rGO@NiNWs/polyimide aerogels show significant potential for next-generation electromagnetic protection in aerospace and wearable applications.