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<p>Functional core–shell heterostructures serve as key components of electromagnetic wave absorbers, enabling the effective integration of advantageous properties from multiple materials. Through synergistic interactions among their components, these structures significantly enhance overall absorption performance. A ZnS@CoNi composite with a core–shell structure was successfully synthesized via a straightforward two-step hydrothermal method. Subsequently, the effects of CoNi addition on the microstructure, phase composition, and absorption properties of the composite were systematically investigated. Research results indicate that with a CoNi loading of 75%, the ZnS@CoNi composite (CN-3) achieves a minimum reflection loss of − 54.62&#xa0;dB at a matching thickness of 2.5&#xa0;mm, along with a maximum effective absorption bandwidth of 4.75&#xa0;GHz at a matching thickness of 1.8&#xa0;mm. The excellent absorption performance of the CN-3 sample is mainly attributed to its unique core–shell structure and the well-matched magnetic and dielectric components. These findings demonstrate the significant potential of ZnS@CoNi composites for use as lightweight absorbers.</p>

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Preparation of ZnS@CoNi core–shell structured micron-sized spheres with impedance matching and electromagnetic wave absorption properties

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Xingyu Zhang,
  • Shasha Jiang,
  • Fangyu Gan,
  • QingRong Yao,
  • Yu Zhou,
  • Zhao Lu,
  • Jianqiu Deng,
  • Lichun Cheng

摘要

Functional core–shell heterostructures serve as key components of electromagnetic wave absorbers, enabling the effective integration of advantageous properties from multiple materials. Through synergistic interactions among their components, these structures significantly enhance overall absorption performance. A ZnS@CoNi composite with a core–shell structure was successfully synthesized via a straightforward two-step hydrothermal method. Subsequently, the effects of CoNi addition on the microstructure, phase composition, and absorption properties of the composite were systematically investigated. Research results indicate that with a CoNi loading of 75%, the ZnS@CoNi composite (CN-3) achieves a minimum reflection loss of − 54.62 dB at a matching thickness of 2.5 mm, along with a maximum effective absorption bandwidth of 4.75 GHz at a matching thickness of 1.8 mm. The excellent absorption performance of the CN-3 sample is mainly attributed to its unique core–shell structure and the well-matched magnetic and dielectric components. These findings demonstrate the significant potential of ZnS@CoNi composites for use as lightweight absorbers.