Quinary High-Entropy-Alloy@Graphite Nanocapsules with Tunable Interfacial Impedance Matching for Optimizing Microwave...

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• Heterogeneous interfaces at the nanoscale optimize electromagnetic wave absorption and shielding.
• Precise control of nanostructure components via efficient synthesis remains a challenge.

Purpose of the Study:

• To propose an efficient synthesis approach for nanoscale heterogeneous components.
• To develop high-entropy alloy@graphite nanocapsules (HEA@C-NPs) for enhanced electromagnetic wave absorption.

Main Methods:

• Arc-discharged plasma method used to synthesize core@shell HEA@C-NPs.
• Methane decomposition encapsulates HEA nanoparticles within graphite layers.
• HEA cores designed with various transition elements for optimized impedance matching.

Main Results:

• FeCoNiTiMn HEA@C-NPs achieved a minimum reflection loss (RLmin) of -33.4 dB at 7.0 GHz.
• An efficient absorption bandwidth (≤-10 dB) of 5.45 GHz was observed from 12.55 to 18.00 GHz.
• Optimized interfacial impedance matching was achieved through HEA core design.

Conclusions:

• The arc-discharged plasma method provides precise control for synthesizing complex nanostructures.
• The developed HEA@C-NPs demonstrate excellent electromagnetic wave absorption properties.
• This approach is extendable to other carbon-coated complex component systems for diverse applications.