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<p>To address the growing issue of electromagnetic radiation pollution, developing efficient electromagnetic wave-absorbing materials is both urgent and challenging. Transition metal carbides/nitrides (MXenes) are excellent conductors of electricity and possess various surface groups and imperfections, making them valuable for studying their microwave absorption capabilities. However, the complex preparation process and limited loss mechanisms of MXenes do not meet the essential requirements for wave-absorbing materials. A mild co-solvent thermal method creates a novel multi-heterostructure wave-absorbing material made of 2D monolayer MXene nanosheets and NiFe<sub>2</sub>O<sub>4</sub> nanoparticles. The MXene@NiFe<sub>2</sub>O<sub>4</sub> heterostructured material demonstrates effective impedance matching, electromagnetic coupling, polarization loss due to heterogeneous interfaces and defects, along with multiple reflections and scattering, resulting in excellent electromagnetic wave absorption performance. Notably, the final electromagnetic wave absorption performance of the MXene@NiFe<sub>2</sub>O<sub>4</sub> hybridized materials is closely linked to their electromagnetic parameters, which can be adjusted by varying the composition ratio of NiFe<sub>2</sub>O<sub>4</sub> nanoparticles. The findings suggest that by using a molar ratio of 1:0.5 of Fe in NiFe<sub>2</sub>O<sub>4</sub> nanoparticles and a loading of 30 wt% of MNF, the MNF hybrids achieve a minimal reflection loss (RL<sub>min</sub>) of − 43.9&#xa0;dB at 12.39&#xa0;GHz (99.994% absorption of the electromagnetic wave); the effective absorption bandwidth (EAB, RL &lt;  − 10&#xa0;dB) is 5.78&#xa0;GHz, encompassing the whole X-band. This endeavor can provide significant insights into the potential applications of few-layer MXene-based composites in highly effective electromagnetic wave absorption.</p>

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Synergistic self-assembly of MXene monolayer dispersions doped with NiFe2O4 nanoparticles for high-performance microwave absorbers

  • 期刊论文

  • 发表日期：

    2025年4月14日

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  • Yizhi Ma,
  • Luning Sun,
  • Wei Wang,
  • Yunxiang Yuan,
  • Hongchao Zhang,
  • Sainan Wei,
  • Bao Shi

摘要

To address the growing issue of electromagnetic radiation pollution, developing efficient electromagnetic wave-absorbing materials is both urgent and challenging. Transition metal carbides/nitrides (MXenes) are excellent conductors of electricity and possess various surface groups and imperfections, making them valuable for studying their microwave absorption capabilities. However, the complex preparation process and limited loss mechanisms of MXenes do not meet the essential requirements for wave-absorbing materials. A mild co-solvent thermal method creates a novel multi-heterostructure wave-absorbing material made of 2D monolayer MXene nanosheets and NiFe2O4 nanoparticles. The MXene@NiFe2O4 heterostructured material demonstrates effective impedance matching, electromagnetic coupling, polarization loss due to heterogeneous interfaces and defects, along with multiple reflections and scattering, resulting in excellent electromagnetic wave absorption performance. Notably, the final electromagnetic wave absorption performance of the MXene@NiFe2O4 hybridized materials is closely linked to their electromagnetic parameters, which can be adjusted by varying the composition ratio of NiFe2O4 nanoparticles. The findings suggest that by using a molar ratio of 1:0.5 of Fe in NiFe2O4 nanoparticles and a loading of 30 wt% of MNF, the MNF hybrids achieve a minimal reflection loss (RLmin) of − 43.9 dB at 12.39 GHz (99.994% absorption of the electromagnetic wave); the effective absorption bandwidth (EAB, RL <  − 10 dB) is 5.78 GHz, encompassing the whole X-band. This endeavor can provide significant insights into the potential applications of few-layer MXene-based composites in highly effective electromagnetic wave absorption.