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Anionic high-entropy doping engineering for electromagnetic wave absorption.

Jiaqi Tao1, Yi Yan1, Jintang Zhou2

  • 1College of Materials Science and Technology, Key Laboratory of Material Preparation and Protection for Harsh Environment, Nanjing University of Aeronautics and Astronautics, Nanjing, 211100, China.

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Summary
This summary is machine-generated.

High-entropy doping (HED) engineering advances electromagnetic wave absorbing (EWA) materials. Anionic HED in graphite enhances EWA by balancing charges and optimizing dielectric loss, achieving superior performance with minimal material.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electromagnetics

Background:

  • High-entropy doping (HED) is a novel strategy for advanced material design.
  • Conventional HED primarily focuses on cationic doping, leaving anionic HED unexplored for electromagnetic wave absorbing (EWA) applications.
  • Tailoring EWA mechanisms requires precise control over material's electronic and atomic structures.

Purpose of the Study:

  • To explore the potential of anionic HED engineering for optimizing EWA materials.
  • To investigate the role of anion multibody interactions in enhancing EWA properties.
  • To develop a novel method for inducing and controlling anionic HED in a graphite framework.

Main Methods:

  • In situ pyrolysis combined with a three-stage solvent thermal doping procedure.
  • Systematic induction of anion multibody interactions within a graphite framework.
  • Characterization of electronic structures and charge balancing effects.

Main Results:

  • Anionic HED precisely balances free charges and creates localized charge imbalance via the 'directional cocktail effect'.
  • This effect optimizes dielectric loss mechanisms, significantly enhancing EWA performance.
  • Achieved an effective absorption bandwidth of 7.05 GHz and a minimum reflection loss of -60 dB with only 7.5 wt% filling.

Conclusions:

  • Anionic HED engineering is a viable strategy for developing high-performance EWA materials.
  • The developed method provides a new pathway for electromagnetic modulation of 2D van der Waals materials.
  • This approach offers a conceptually extendable framework for designing advanced electromagnetic materials.