Self-Templating Engineering of Hollow N-Doped Carbon Microspheres Anchored with Ternary FeCoNi Alloys for Low-Frequency Microwave Absorption

Luwei Li, Qingfu Ban, Yuejie Song, Jie Liu, Yusheng Qin, Tiantian Zhang, Jie Kong

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Rational design and precision fabrication of magnetic-dielectric composites have significant application potential for microwave absorption in the low-frequency range of 2–8 GHz. However, the composition and structure engineering of these composites in regulating their magnetic-dielectric balance to achieve high-performance low-frequency microwave absorption remains challenging. Herein, a self-templating engineering strategy is proposed to fabricate hollow N-doped carbon microspheres anchored with ternary FeCoNi alloys. The high-temperature pyrolysis of FeCoNi alloy precursors creates core-shell FeCoNi alloy-graphitic carbon nano-units that are confined in carbon shells. Moreover, the anchored FeCoNi alloys play a critical role in maintaining hollow structural stability. In conjunction with the additional contribution of multiple heterogeneous interfaces, graphitization, and N doping to the regulation of electromagnetic parameters, hollow FeCoNi@NCMs exhibit a minimum reflection loss (RLmin) of −53.5 dB and an effective absorption bandwidth (EAB) of 2.48 GHz in the low-frequency range of 2–8 GHz. Furthermore, a filler loading of 20 wt% can also be used to achieve a broader EAB of 5.34 GHz with a matching thickness of 1.7 mm. In brief, this work opens up new avenues for the self-templating engineering of magnetic-dielectric composites for low-frequency microwave absorption.

Original languageEnglish
Article number2406602
JournalSmall
Volume20
Issue number50
DOIs
StatePublished - 12 Dec 2024

Keywords

  • FeCoNi alloys
  • hollow carbon microspheres
  • impedance matching
  • magnetic-dielectric synergy
  • microwave absorption

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