Construction of 1D Heterogeneous Co/C@Ag Nws With Tunable Electromagnetic Wave Absorption And Shielding Performance

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• Developing advanced materials for electromagnetic wave prevention is crucial for modern electronics and defense.
• Existing materials often struggle to balance absorption and shielding capabilities.
• Nanostructured materials offer unique properties for electromagnetic wave management.

Purpose of the Study:

• To synthesize and characterize 1D heterogeneous Co/C@Ag NWs with tunable microstructures.
• To investigate the electromagnetic wave prevention performance (absorption and shielding) of these novel composites.
• To understand the structure-property relationships governing their electromagnetic wave management.

Main Methods:

• Synthesis of silver nanowires (Ag NWs).
• In situ growth of ZIF-67 on Ag NWs followed by calcination to form Co/C@Ag NWs with kebab- and popsicle-like structures.
• Evaluation of electromagnetic wave absorption and shielding effectiveness in paraffin composites.

Main Results:

• Co/C@Ag NWs with popsicle-like structures and high Co/C loading achieved excellent absorption (RLmin of -44.5 dB at 30 wt.%).
• Co/C@Ag NWs with kebab-like structures and low Co/C loading demonstrated effective EMI shielding (SE T of 30.2 dB at 30 wt.%).
• Performance is linked to Co/C loading and microstructure, with multiple dissipation mechanisms contributing to absorption and Ag NW conductivity enhancing shielding.

Conclusions:

• The Co/C@Ag NWs exhibit tunable electromagnetic wave absorption and shielding properties based on microstructure and loading.
• Synergistic effects of dielectric, magnetic, polarization, eddy-current, and multiple reflection losses contribute to absorption.
• High conductivity of Ag NWs is key for electromagnetic interference shielding effectiveness.