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Intercalation-Induced Interlayer and Defect Engineering in Ti3C2T MXene for Ultralow-Reflection Electromagnetic

Ruosong Li1, Youpeng Huangfu2, Lulu Liu3

  • 1School of Chemical Engineering, Northwest University, Xi'an 710127, China.

ACS Nano
|January 8, 2025
PubMed
Summary

This study engineered MXene aerogels with tunable spacing and defects using amine intercalants. The P-phenylenediamine (PPD) enhanced material achieved superior absorption-dominated electromagnetic interference (EMI) shielding.

Keywords:
EMI shieldingTi3C2Tx MXeneamine intercalationdefectinterlayer spacing

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electromagnetics

Background:

  • Electrical conductivity and electromagnetic interference (EMI) shielding of Ti3C2T MXene are significantly influenced by interlayer and defect engineering.
  • Prior research has focused on intercalant size, neglecting chemical affinity, which hinders understanding of intercalation mechanisms and precise control over interlayer spacing (d-spacing).

Purpose of the Study:

  • To synthesize MXene aerogels with tunable d-spacing and defect density.
  • To investigate the impact of amine intercalants with varying sizes and chemical affinities on MXene properties.
  • To develop advanced materials for efficient EMI shielding.

Main Methods:

  • Synthesis of MXene aerogels using a series of amine molecules as intercalants and cross-linkers.
  • Tuning of d-spacing and defect density through controlled intercalation.
  • Characterization of structural and electrical properties.
  • Evaluation of EMI shielding performance, focusing on absorptivity and shielding effectiveness.

Main Results:

  • Intercalation with p-phenylenediamine (PPD) increased MXene d-spacing from 0.960 to 1.642 nm.
  • Increased d-spacing led to higher defect density within the Ti-Ti layer.
  • PPD@MXene aerogel demonstrated absorption-dominated EMI shielding with absorptivity of 0.92 and shielding effectiveness of 50.4 dB.
  • Reduced surface electric field intensity and increased internal polarization loss were observed.

Conclusions:

  • The study successfully engineered MXene aerogels with controlled d-spacing and defect density using amine intercalants.
  • The PPD@MXene aerogel exhibits exceptional EMI shielding performance, primarily through absorption.
  • This work provides a foundation for developing advanced, interlayer-engineered MXene shielding materials.