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<p>Reduced graphene oxide (rGO) demonstrates significant potential as an electromagnetic wave (EM) absorbent due to its tunable dielectric properties, yet its practical performance is constrained by excessive conductivity and insufficient magnetic loss. To address these limitations, we developed a core–shell Ni@NiO/rGO heterojunction architecture through magnetic component hybridization. This design enables synergistic enhancement of magnetic-dielectric loss mechanisms by optimizing multi-domain magnetic resonance and impedance matching. The resulting aerogel achieves exceptional EM absorption performance with a strong reflection loss (RL<sub>min</sub>) of −&#xa0;49.39&#xa0;dB at 2.5&#xa0;mm thickness and an ultra-wide effective absorption bandwidth (EAB) of 8.02&#xa0;GHz at 3.0&#xa0;mm. Through systematic investigation, we quantitatively established a critical microstructure-property linkage between calcination time and electromagnetic parameters. Finally, this work presents a heterocomponent magnetic synergy strategy that advances the development of high-performance and broadband rGO-based EM absorbers.</p>

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Enhanced dielectric-magnetic synergy in hybrid Ni@NiO/rGO aerogel enables high-performance electromagnetic wave absorption

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • Xueting Liu,
  • Yujing Zhang,
  • Rui Liu,
  • Liang Yan,
  • Yilin Zhang,
  • Xiaopeng Li,
  • Chuyang Liu,
  • Jun Liu,
  • Feng Xu

摘要

Reduced graphene oxide (rGO) demonstrates significant potential as an electromagnetic wave (EM) absorbent due to its tunable dielectric properties, yet its practical performance is constrained by excessive conductivity and insufficient magnetic loss. To address these limitations, we developed a core–shell Ni@NiO/rGO heterojunction architecture through magnetic component hybridization. This design enables synergistic enhancement of magnetic-dielectric loss mechanisms by optimizing multi-domain magnetic resonance and impedance matching. The resulting aerogel achieves exceptional EM absorption performance with a strong reflection loss (RLmin) of − 49.39 dB at 2.5 mm thickness and an ultra-wide effective absorption bandwidth (EAB) of 8.02 GHz at 3.0 mm. Through systematic investigation, we quantitatively established a critical microstructure-property linkage between calcination time and electromagnetic parameters. Finally, this work presents a heterocomponent magnetic synergy strategy that advances the development of high-performance and broadband rGO-based EM absorbers.