Lightweight and High-Performance Microwave Absorber Based on 2D WS₂-RGO Heterostructures

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• Two-dimensional (2D) nanomaterials offer unique properties for microwave absorption (MA).
• High specific surface area and electronic characteristics are key to MA performance.
• Graphene oxide and transition metal dichalcogenides are promising MA components.

Purpose of the Study:

• To synthesize and characterize 2D WS2-reduced graphene oxide (WS2-rGO) heterostructure nanosheets.
• To investigate the dielectric and microwave absorption properties of WS2-rGO.
• To explore the synergistic mechanisms behind enhanced microwave absorption in WS2-rGO.

Main Methods:

• Facile hydrothermal synthesis of WS2-rGO heterostructure nanosheets.
• Preparation of sample-wax composites for microwave absorption testing.
• Characterization of dielectric properties and reflection loss (RL).

Main Results:

• WS2-rGO nanosheets were successfully synthesized.
• Maximum reflection loss (RL) reached -41.5 dB at 2.7 mm thickness for 40 wt% WS2-rGO.
• Effective absorption bandwidth (RL < -10 dB) extended to 13.62 GHz (4.38-18 GHz).

Conclusions:

• The WS2-rGO heterostructure exhibits significantly enhanced microwave absorption performance.
• Synergistic effects from interfacial dielectric coupling and multiple-interface scattering contribute to MA.
• These lightweight WS2-rGO nanosheets are promising for practical electromagnetic wave-absorbing applications.