ZnO-decorated SiC@C hybrids with strong electromagnetic absorption

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetism

Background:

• Silicon carbide (SiC) nanomaterials are explored for electromagnetic wave absorption.
• Improving the absorption efficiency and bandwidth of SiC-based materials is crucial for practical applications.

Purpose of the Study:

• To develop a novel strategy for enhancing SiC nanomaterial absorption.
• To synthesize and characterize SiC@C-ZnO composites for electromagnetic wave absorption.

Main Methods:

• Surface carbonization of SiC nanowires and hydrolysis were employed.
• SiC@C-ZnO composites were synthesized with varying zinc nitrate hexahydrate dosages.
• Composition, microstructure, and electromagnetic properties were analyzed using TEM, XRD, and electromagnetic measurements.

Main Results:

• Crystalline ZnO particles were observed on amorphous carbon surfaces, with ZnO content increasing with precursor dosage.
• The SiC@C-ZnO hybrids demonstrated effective electromagnetic absorption due to synergistic dielectric loss.
• A minimum reflection loss of -65.4 dB at 11 GHz and an effective absorption bandwidth (EAB) of 7 GHz were achieved.
• Broadband absorption covering X and Ku bands was observed at small sample thicknesses (2.09-3.47 mm).

Conclusions:

• The developed SiC@C-ZnO composites exhibit superior electromagnetic absorption properties.
• The synergy between SiC, carbon, and ZnO contributes to enhanced dielectric loss.
• These materials show significant potential for use as high-performance electromagnetic absorbers.