Core-Shell Structured SiO₂@NiFe LDH Composite for Broadband Electromagnetic Wave Absorption.

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• Electromagnetic wave contamination poses environmental and technological challenges.
• Developing efficient and cost-effective microwave absorbers is crucial.
• Layered double hydroxides (LDHs) show potential for microwave absorption applications.

Purpose of the Study:

• To synthesize and characterize a novel core-shell material, SiO2@NiFe LDH, for microwave absorption.
• To investigate the influence of NiFe element ratios on the material's properties.
• To evaluate the microwave absorption performance of the synthesized nanocomposites.

Main Methods:

• One-step hydrothermal synthesis of SiO2@NiFe LDH core-shell nanocomposites.
• Systematic investigation of morphology, structure, and microwave absorption properties.
• Analysis of varying NiFe element ratios to optimize performance.

Main Results:

• The SiO2@NiFe LDH-3 nanocomposite demonstrated excellent microwave absorption properties.
• Achieved a broadband effective absorption bandwidth of 8.24 GHz (9.76–18.0 GHz).
• Recorded a reflection loss of -53.78 dB at a matched thickness of 6.95 mm.

Conclusions:

• The developed SiO2@NiFe LDH core-shell material exhibits superior microwave absorption capabilities.
• This material presents a promising non-precious, metal-based alternative for electromagnetic wave contamination mitigation.
• The findings pave the way for practical applications in electromagnetic shielding and stealth technologies.