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Electrochemically Cation-Induced Three-Phase Conversion for Consecutively Tunable Electromagnetic Wave Response.

Yongbo Yu1, Qian Fei1, Kailing Zhou1,2

  • 1Key Laboratory for New Functional Materials of Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China.

Advanced Materials (Deerfield Beach, Fla.)
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Summary
This summary is machine-generated.

This study introduces a novel device for tunable electromagnetic wave shielding. The material exhibits controllable conductivity and dielectric properties, enhancing shielding effectiveness for advanced electronics.

Keywords:
cation insertiondynamic regulationelectromagnetic wavethree‐phase conversion

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electrical Engineering

Background:

  • Electromagnetic wave (EMW) shielding materials face limitations in modulation flexibility and reliability.
  • Integrated electronics demand advanced materials with tunable electromagnetic responses.

Purpose of the Study:

  • To design and demonstrate a device for dynamic and precise control of electromagnetic waves (EMWs).
  • To investigate the mechanism of tunable electromagnetic shielding through electrochemical control.

Main Methods:

  • Fabrication of a sandwich-structured device: metal mesh@HxWO3/H2SO4/hollow graphite.
  • In-situ characterizations and theoretical simulations.
  • Electrochemical cation intercalation and voltage management.

Main Results:

  • Reversible phase conversion of HxWO3 (monoclinic to tetragonal to cubic) induced by voltage.
  • Enhanced conductivity and dielectric properties due to cation intercalation and dipole formation.
  • Achieved outstanding modulation capability (Δ: 42.36 dB) and tunable shielding intensity (10.98–53.34 dB).

Conclusions:

  • The developed device offers a remarkable technology for dynamical regulation of EMWs.
  • The material's tunable properties provide enhanced electromagnetic shielding effectiveness for demanding applications.