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<p>Microwave-absorbing materials are the need of the hour, given the escalating challenges posed by electromagnetic interference (EMI) in modern electronic and communication systems. This work reports the development of thin, flexible electromagnetic absorbers based on activated carbon derived from banana leaves, offering a sustainable approach to high-performance EMI shielding. Activated carbon was produced via controlled carbonization and was comprehensively characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA), confirming its porous structure and thermal stability. The activated carbon was subsequently incorporated into flexible films of various thicknesses, which exhibited uniform morphology and mechanical flexibility. Electromagnetic shielding measurements in the X-band (8.2–12.4&#xa0;GHz) revealed that the optimized films achieved a total shielding efficiency of –22.09&#xa0;dB, with absorption loss (SEA) accounting for –19.81&#xa0;dB, representing 90% of the overall attenuation with a thickness of 0.8&#xa0;mm. Furthermore, the films demonstrated a broad effective absorption bandwidth (EAB) of 4.2&#xa0;GHz, ensuring efficient EMI suppression across a wide frequency range. These findings underscore the promise of banana leaf-derived activated carbon as a green, flexible, and highly effective material for next-generation electromagnetic shielding technologies.</p>

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Sustainable microwave absorption using banana leaf-derived activated carbon composites

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • Geetika Verma,
  • Saurabh Parmar,
  • Suwarna Datar,
  • Kamla Prasan Ray

摘要

Microwave-absorbing materials are the need of the hour, given the escalating challenges posed by electromagnetic interference (EMI) in modern electronic and communication systems. This work reports the development of thin, flexible electromagnetic absorbers based on activated carbon derived from banana leaves, offering a sustainable approach to high-performance EMI shielding. Activated carbon was produced via controlled carbonization and was comprehensively characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA), confirming its porous structure and thermal stability. The activated carbon was subsequently incorporated into flexible films of various thicknesses, which exhibited uniform morphology and mechanical flexibility. Electromagnetic shielding measurements in the X-band (8.2–12.4 GHz) revealed that the optimized films achieved a total shielding efficiency of –22.09 dB, with absorption loss (SEA) accounting for –19.81 dB, representing 90% of the overall attenuation with a thickness of 0.8 mm. Furthermore, the films demonstrated a broad effective absorption bandwidth (EAB) of 4.2 GHz, ensuring efficient EMI suppression across a wide frequency range. These findings underscore the promise of banana leaf-derived activated carbon as a green, flexible, and highly effective material for next-generation electromagnetic shielding technologies.