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Microwave-Driven Dielectric-Magnetic Regulation of Graphite@α-MnO₂ Toward Enhanced Electromagnetic Wave Absorption.

Junyu Lu^1,2, Lei Xu^1,2,3, Cheng Xie^1,2

¹Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, PR China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|June 20, 2025

Summary

Researchers developed an advanced electromagnetic wave-absorbing material using expanded graphite and manganese dioxide nanowires. This novel composite offers superior shielding for wireless communication technologies.

Keywords:

electromagnetic wave absorption functional structure impedance matching microwave activation microwave hydrothermal nanowire

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Area of Science:

Materials Science
Nanotechnology
Electromagnetics

Background:

Wireless communication advancements require effective electromagnetic wave absorption and interference shielding materials.
Existing materials often struggle to balance dielectric and magnetic properties for optimal performance.

Purpose of the Study:

To develop a novel material with synergistic dielectric and magnetic properties for electromagnetic wave absorption.
To engineer a composite structure integrating expanded graphite and manganese dioxide nanowires.

Main Methods:

In situ synthesis of manganese oxide nanowires on expanded graphite via microwave-assisted hydrothermal methods.
Microwave activation to convert manganese oxide-hydroxide to magnetic α-MnO2.
Fabrication of a nanowire fabric/multilayer composite structure (EG@MO).

Main Results:

The EG@MO composite achieved exceptional electromagnetic wave absorption with a reflection loss of -75.56 dB.
High performance was observed at a low filler ratio (7 wt.%) and ultrathin thickness (1.48 mm).
The material demonstrated synergistic regulation of dielectric and magnetic properties.

Conclusions:

The developed EG@MO material offers high-performance electromagnetic wave absorption and shielding.
The integration of magnetic manganese dioxide nanowires with expanded graphite is effective.
This material shows significant potential for widespread applications in advanced wireless communication.