Highly compatible ZIF-11 MOF-embedded carbon foam nanocomposites for efficient electromagnetic wave absorption.

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• Effective electromagnetic wave (EMW) absorption is vital for mitigating high-frequency electromagnetic radiation exposure.
• Developing lightweight, high-performance materials is crucial for advanced applications.

Purpose of the Study:

• To create a novel hybrid composite for wide-range EMW attenuation in the radar range (X-band).
• To investigate the EMW absorption properties of ZIF-11 MOF incorporated into carbon foam (CF).

Main Methods:

• Synthesized ZIF-11/CF hybrid composites with controlled MOF loadings.
• Characterized structural features and composition using XRD, SEM, FTIR, and TGA.
• Evaluated EMW absorption performance, including reflection loss and effective absorption bandwidth.

Main Results:

• The 12% ZIF-11/CF composite demonstrated optimal EMW absorption.
• Achieved a reflection loss of -49.12 dB and a broad effective absorption bandwidth of 4.2 GHz at 2 mm thickness.
• Attained 99.99% absorption, covering nearly the entire X-band with improved impedance matching and dielectric loss.

Conclusions:

• The ZIF-11/carbon foam composite offers excellent EMW absorption properties.
• The lightweight, porous structure enhances multiple scattering and dielectric loss for superior performance.
• This material presents a scalable pathway for advanced applications in electronics, healthcare, and defense through effective EMI reduction.