Catfish Effect Induced by Anion Sequential Doping for Microwave Absorption

Jiaqi Tao, Linling Xu, Changbao Pei, Yansong Gu, Yanru He, Xianfei Zhang, Xuewei Tao, Jintang Zhou, Zhengjun Yao, Shifei Tao, Hongjing Wu

Research output: Contribution to journalArticlepeer-review

137 Scopus citations

Abstract

Heteroatom doping engineering is desirable in tuning crystal structures and electrical properties, which is considered an opportunity to further develop microwave absorption materials. However, the competition mechanism and priority among doped atoms have not been revealed, which are insufficient to guide the most reasonable dielectric coupling model and design high-performance absorbers. In this work, based on in situ N and O, ex situ S is introduced through external thermal driving, leading to fierce competition among anions. Specifically, S atoms replace pyrrole N, drive out lattice O, and create O vacancies, bringing more extensive local charge redistribution and stronger electron interaction, thus activating the defect-induced polarization (3–6 times higher than conduction loss) in the middle/high-frequency region. Therefore, the effective absorption bandwidth (EAB) of 9.03 GHz and the minimum reflection loss (RLmin) of −64.05 dB at a filling rate of 10 wt.% are obtained, which improves the record of carbon absorbers as reported. Through macro-designs, i.e., multi-layer gradient metamaterial, or utilizing other advantages, e.g., cost-effective, stable chemical properties and wide-angle absorption, porous carbon may possess a great application prospect in the naval field.

Original languageEnglish
Article number2211996
JournalAdvanced Functional Materials
Volume33
Issue number8
DOIs
StatePublished - 16 Feb 2023

Keywords

  • anion competitions
  • catfish effects
  • heteroatom doping
  • microwave absorption
  • porous carbon

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