Constructing multi-layer heterogeneous interfaces in liquid metal graphite hybrid powder: Towards microwave...

Area of Science:

• Materials Science
• Electromagnetics
• Nanotechnology

Background:

• Carbon-based materials are common for microwave absorption due to low density and high attenuation.
• High conductivity of carbon materials often results in high reflection loss, limiting their application.
• Need for improved impedance matching and attenuation in microwave absorbers.

Purpose of the Study:

• To reduce reflection loss and enhance microwave absorption performance.
• To construct multi-layer heterogeneous interfaces in liquid metal graphite hybrid powder.
• To improve impedance matching and attenuation constant using gallium oxide.

Main Methods:

• Fabrication of liquid metal graphite hybrid powder.
• Coating graphite powder with gallium (Ga).
• Annealing treatment to form gallium oxide (Ga2O3) layers and create heterogeneous interfaces.

Main Results:

• Hybrid particles with 50 wt% Ga annealed at 120°C for 2h showed a minimum reflection loss (RLmin) of -42.68 dB.
• Achieved a maximum effective absorption bandwidth (EAB) of 4.11 GHz at a thickness of 3.3 mm.
• Demonstrated multi-layer structures with varying electrical conductivity and heterojunctions enhancing polarization.

Conclusions:

• The developed hybrid particles effectively reduce reflection loss and improve microwave absorption.
• The multi-layer heterogeneous structure and heterojunctions are key to enhanced performance.
• This approach offers a promising strategy for designing advanced microwave absorption materials.