PANI-Promoted Controlled Synthesis of CoO/Co/Hollow C Fibres: Microstructural Regulation and Electromagnetic Wave...

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetism

Background:

• Developing high-performance electromagnetic wave (EMW) absorbing materials is crucial for next-generation technologies.
• Biomass microstructures offer unique templates for advanced material design.
• Controllable magnetic nanoparticle synthesis is key for precise electromagnetic parameter modulation.

Purpose of the Study:

• To investigate the dielectric loss (tanδ_ε) design principle of hollow carbon composite fibers for EMW absorption.
• To explore the use of biomass fibers as carbon templates modified with polyaniline (PANI) and ZIF-67 particles.
• To establish a magnetic nanoparticle loading strategy for optimizing EMW absorption properties.

Main Methods:

• Utilized hollow biomass fibers as carbon templates.
• Modified fibers with polyaniline (PANI) for ZIF-67 particle growth.
• Systematically regulated carbonization temperature to tune material properties.
• Analyzed electromagnetic parameters and EMW absorption performance.

Main Results:

• Achieved minimum reflection loss (RL_min) of -55 dB for CoO/Co/CP@TCF and -53 dB for CP@TCF.
• Obtained maximum effective absorption bandwidth (EAB_max) of 6.5 GHz and 5.4 GHz, respectively.
• Maintained ultra-thin material thicknesses (2.38 mm and 2.18 mm).
• Confirmed significant charge carrier separation and interfacial polarization via electron hologram analysis.

Conclusions:

• Demonstrated a viable strategy for developing high-performance biomass-derived carbon/magnetic composites for EMW absorption.
• The proposed magnetic nanoparticle loading strategy is broadly applicable to various biomass-derived materials.
• Established a mechanism for modulating electromagnetic parameters and EMW absorption properties.