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Lightweight Co3O4/CC Composites with High Microwave Absorption Performance.

Bing An1,2, Mei Wu1, Xinhuang Yang1

  • 1Hangzhou Dianzi University, Hangzhou 310018, China.

Nanomaterials (Basel, Switzerland)
|July 14, 2023
PubMed
Summary

Flexible cobalt oxide/carbon cloth composites were developed for advanced microwave absorption. These materials offer excellent performance at low frequencies, demonstrating significant potential for military radar applications.

Keywords:
Co-MOFs/CCCo3O4/CClow frequencythinner thickness

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electromagnetics

Background:

  • Growing demand for thin, low-frequency microwave-absorbing materials in military radar technology.
  • Need for flexible and high-performance electromagnetic wave attenuation solutions.
  • Limitations of existing materials in terms of thickness and absorption bandwidth.

Purpose of the Study:

  • To synthesize flexible Co3O4/CC composites from Co-MOFs and carbon cloth (CC) for microwave absorption.
  • To investigate the effect of calcination temperature on material properties and microwave absorption.
  • To evaluate the microwave absorption performance, including reflection loss and effective absorption bandwidth.

Main Methods:

  • Hydrothermal and thermal treatment processes for composite synthesis.
  • Calcination of Co-MOFs/CC precursors at varying temperatures.
  • Characterization of material structure and dielectric properties.
  • Measurement of microwave absorption performance (Reflection Loss, bandwidth).

Main Results:

  • Calcination temperature influences the structure, dielectric properties, and microwave absorption of Co3O4/CC composites.
  • Minimum reflection loss shifts to lower frequencies with increased calcination temperature and reduced thickness.
  • Achieved minimum reflection loss of -46.59 dB at 6.24 GHz with 4.2 mm thickness for 25 wt% filler loading.
  • Obtained an effective absorption bandwidth of 3.04 GHz (5.84–8.88 GHz) at a thickness of 3.70 mm.

Conclusions:

  • Co3O4/CC composites derived from Co-MOFs are effective and flexible microwave-absorbing materials.
  • The study provides insights for developing wideband microwave absorbers below 10 GHz.
  • Optimized calcination conditions and filler loading enhance low-frequency microwave absorption capabilities.