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<p>The development of high-performance, eco-friendly, and multifunctional electromagnetic interference (EMI) shielding nanocomposites is highly desirable. Recently, transition metal/nitrides (MXenes) have showcased great potential in constructing EMI shields, but are restricted by low yield, limited utilization efficiency, and cost-ineffective preparation for practical applications. This work introduces a novel nanocomposite film comprising “waste” MXene sediments (MS) and sustainable cellulose nanofibers (CNFs), fabricated through a simple, straightforward casting approach. The nanocomposites not only enhance the utilization of MXene layers but also deliver exceptional EMI shielding effectiveness (SE), with the 80 wt.% MS/CNF nanocomposite film achieving 52.3 dB X-band SE at just 0.57 mm thickness. Notably, the EMI SE can be precisely tuned over a broad frequency range, including the X-, Ku-, K-, and Ka-bands, where the nanocomposite consistently exceeds 53.9 dB at 0.50 mm thickness. In addition, the nanocomposite film exhibits remarkable photothermal responses, reaching 100 °C within 80 s under 100 mW/cm<sup>2</sup> light exposure. With its outstanding mechanical strength, electrical conductivity, and environmental sustainability, the MS/CNF nanocomposite shows immense potential for applications in wearable electronics, EMI shielding, and thermal therapy, offering a versatile and scalable solution for next-generation electronic and energy-efficient technologies.</p>

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Valorization of “waste” MXene through multifunctional green composites with high-efficiency EMI shielding

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Zihan Liu,
  • Jiaxin Song,
  • Sen Jiao,
  • Na Wu,
  • Yue Zhang,
  • Zhuyin Sui,
  • Jiurong Liu,
  • Sinan Zheng,
  • Zhihui Zeng

摘要

The development of high-performance, eco-friendly, and multifunctional electromagnetic interference (EMI) shielding nanocomposites is highly desirable. Recently, transition metal/nitrides (MXenes) have showcased great potential in constructing EMI shields, but are restricted by low yield, limited utilization efficiency, and cost-ineffective preparation for practical applications. This work introduces a novel nanocomposite film comprising “waste” MXene sediments (MS) and sustainable cellulose nanofibers (CNFs), fabricated through a simple, straightforward casting approach. The nanocomposites not only enhance the utilization of MXene layers but also deliver exceptional EMI shielding effectiveness (SE), with the 80 wt.% MS/CNF nanocomposite film achieving 52.3 dB X-band SE at just 0.57 mm thickness. Notably, the EMI SE can be precisely tuned over a broad frequency range, including the X-, Ku-, K-, and Ka-bands, where the nanocomposite consistently exceeds 53.9 dB at 0.50 mm thickness. In addition, the nanocomposite film exhibits remarkable photothermal responses, reaching 100 °C within 80 s under 100 mW/cm2 light exposure. With its outstanding mechanical strength, electrical conductivity, and environmental sustainability, the MS/CNF nanocomposite shows immense potential for applications in wearable electronics, EMI shielding, and thermal therapy, offering a versatile and scalable solution for next-generation electronic and energy-efficient technologies.