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<p>The escalating electromagnetic (EM) pollution necessitates the development of high-performance microwave absorbers (MAs) with integrated functionalities. However, it is still a difficult problem to integrate more related high performances into the designed MAs. Herein, a sustainable strategy was reported for fabricating three-dimensional (3D) porous magnetic Ni@C-anchored carbon foams (Ni@C/CFs) with abundant heterointerfaces and magnetic Ni@C nanoparticles using 3D porous chitosan foams and Ni-nitrilotriacetic acid chelate (Ni-NAC) as precursors. The modulation of carbonization temperature and concentration of Ni-NAC solution contributed to the tunable carbon graphitization, Ni crystallinity and magnetic Ni@C nanoparticles loading, which effectively improved their EM properties and EM wave absorption performances (EMWAPs). The optimized 3D porous magnetic Ni@C/CFs not only exhibited exceptional EMWAPs with a minimum reflection loss (RL<sub>min</sub>) of −27.58 dB and an ultra-wide effective absorption bandwidth (EAB) of 7.20 GHz, but also presented efficient thermal insulation and strong antibacterial activity (&gt;95% inhibition against <i>E. coli</i>), which mainly originated from their excellent magnetic-dielectric synergies and unique 3D hierarchical porous structures. Consequently, this work delivers a coherent design strategy for next-generation multifunctional absorbers with potential applications in EM protection, thermal management, and adaptive stealth technologies.</p>

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Constructing porous magnetic Ni@C-anchored carbon foams for excellent magnetic-dielectric synergy to develop integrated microwave absorbers with efficient thermal insulation and antibacterial properties

  • 期刊论文

  • 发表日期：

    2026年5月6日

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  • Jiayu Wei,
  • Qiqin Liang,
  • Xucai Kan,
  • Zhiyun Tan,
  • Beibei Zhan,
  • Junfei Ding,
  • Yunpeng Qu,
  • Qiong Peng,
  • Jingliang Yang,
  • Xiaosi Qi

摘要

The escalating electromagnetic (EM) pollution necessitates the development of high-performance microwave absorbers (MAs) with integrated functionalities. However, it is still a difficult problem to integrate more related high performances into the designed MAs. Herein, a sustainable strategy was reported for fabricating three-dimensional (3D) porous magnetic Ni@C-anchored carbon foams (Ni@C/CFs) with abundant heterointerfaces and magnetic Ni@C nanoparticles using 3D porous chitosan foams and Ni-nitrilotriacetic acid chelate (Ni-NAC) as precursors. The modulation of carbonization temperature and concentration of Ni-NAC solution contributed to the tunable carbon graphitization, Ni crystallinity and magnetic Ni@C nanoparticles loading, which effectively improved their EM properties and EM wave absorption performances (EMWAPs). The optimized 3D porous magnetic Ni@C/CFs not only exhibited exceptional EMWAPs with a minimum reflection loss (RLmin) of −27.58 dB and an ultra-wide effective absorption bandwidth (EAB) of 7.20 GHz, but also presented efficient thermal insulation and strong antibacterial activity (>95% inhibition against E. coli), which mainly originated from their excellent magnetic-dielectric synergies and unique 3D hierarchical porous structures. Consequently, this work delivers a coherent design strategy for next-generation multifunctional absorbers with potential applications in EM protection, thermal management, and adaptive stealth technologies.