Two-Dimensional Basalt/Ni Microflakes with Uniform and Compact Nanolayers for Optimized Microwave Absorption...

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• Uniform distribution of magnetic particles is known to benefit microwave absorption.
• The precise mechanism by which homogeneous magnetic particles on dielectric substrates enhance electromagnetic loss remains unclear.

Purpose of the Study:

• To investigate the impact of uniform versus scattered nickel nanolayers on basalt substrates for microwave absorption.
• To elucidate the relationship between nanostructure uniformity and electromagnetic loss mechanisms.

Main Methods:

• Pretreatment and electroless deposition were used to synthesize nickel nanoparticles, scattered Ni on basalt, and uniform Ni on basalt microflakes.
• Characterization of material properties and microwave absorption performance.

Main Results:

• Basalt/uniform Ni microflakes exhibited superior electromagnetic attenuation compared to Ni nanoparticles and basalt/scattered Ni.
• Uniform Ni nanolayers facilitated a conductive network, electron migration, multiple scattering, interfacial polarization, and magnetic resonance.
• Minimum reflection loss of -30 dB and an effective absorption bandwidth of 3 GHz at 1 mm were achieved.

Conclusions:

• Uniform and compact magnetic metal nanolayers are highly effective for high-performance microwave absorption.
• Simultaneous enhancement of dielectric and magnetic loss is achieved through optimized nanostructure.
• This study clarifies the importance of uniform nanolayer formation for electromagnetic wave attenuation.