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High-Precision Printing of Flexible MXene Patterns for Dynamically Tunable Electromagnetic Interference Shielding

Lulu Li1, Cheng-Zhang Qi1, Mengjie Chen1

  • 1State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.

ACS Applied Materials & Interfaces
|February 28, 2024
PubMed
Summary

Researchers developed smart electromagnetic interference (EMI) shielding materials using direct printing. This innovation offers tunable shielding effectiveness by altering subwavelength structures, addressing key challenges in electronic device protection.

Keywords:
MXene inksdynamically tunable performanceelectromagnetic interference shieldingprecision printingsubwavelength structure

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Area of Science:

  • Materials Science
  • Electromagnetics
  • Nanotechnology

Background:

  • Advanced electronic devices require effective electromagnetic interference (EMI) shielding.
  • Current smart EMI shielding materials face limitations like thickness, tunability, and reversibility.

Purpose of the Study:

  • To develop a novel method for controllable EMI shielding using subwavelength structure modulation.
  • To create high-performance, tunable EMI shielding materials via direct printing.

Main Methods:

  • Direct printing of MXene ink regulated with aluminum ions (Al³⁺) to achieve high conductivity without annealing.
  • Controllable modulation of subwavelength structures using stress to tune EMI shielding effectiveness.
  • Characterization of material conductivity and EMI shielding performance.

Main Results:

  • Achieved high metallic conductivity (∼5000 S cm⁻¹) in printed lines.
  • Demonstrated reversible tunability of EMI shielding effectiveness (SE) from 8.2 dB (off-state) to 34 dB (on-state).
  • Successfully regulated subwavelength structures via stress for tunable shielding.

Conclusions:

  • The developed method provides a feasible strategy for creating intelligent EMI shielding materials.
  • This approach offers a pathway to overcome existing challenges in smart EMI shielding.
  • The study paves the way for advanced, adaptable electromagnetic shielding devices.