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Related Concept Videos

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

782
An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
782

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Scalable Solution-processed Fabrication Strategy for High-performance, Flexible, Transparent Electrodes with Embedded Metal Mesh
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Ultrahigh Conductive MXene Films for Broadband Electromagnetic Interference Shielding.

Ju-Hyoung Han1, Jaeeun Park1, Mincheal Kim2

  • 1Department of Materials Science and Engineering and Graduate School of Semiconductor Materials and Devices Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.

Advanced Materials (Deerfield Beach, Fla.)
|April 25, 2025
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Summary

New TiₓC<0xE1><0xB5><0xA7>Nₓ<0xE2><0x82><0x93>y<0xE2><0x82><0x93>₁T<0xE1><0xB5><0xA3> MXene films with nitrogen offer record electrical conductivity and broadband electromagnetic interference (EMI) shielding, advancing high-frequency electronics.

Keywords:
EMI shieldingMAX phaseMXeneX‐site solid solutionconductivitynitrogen

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrical Engineering

Background:

  • Advanced materials are essential for high-frequency data transmission in emerging technologies.
  • MXenes possess excellent electrical conductivity and electromagnetic interference (EMI) shielding properties.
  • Synthesizing nitrogen-substituted MXenes presents significant challenges.

Purpose of the Study:

  • To synthesize and characterize TiₓC<0xE1><0xB5><0xA7>Nₓ<0xE2><0x82><0x93>y<0xE2><0x82><0x93>₁T<0xE1><0xB5><0xA3> MXene films with optimized nitrogen content.
  • To investigate the impact of nitrogen substitution on MXene properties.
  • To achieve enhanced electrical conductivity and broadband EMI shielding.

Main Methods:

  • Synthesis of TiₓAlC<0xE1><0xB5><0xA7>Nₓ<0xE2><0x82><0x93>y<0xE2><0x82><0x93>₁ MAX phases.
  • Fabrication of TiₓC<0xE1><0xB5><0xA7>Nₓ<0xE2><0x82><0x93>y<0xE2><0x82><0x93>₁T<0xE1><0xB5><0xA3> MXene films.
  • Systematic exploration of nitrogen content's effect on physical and electrical properties.
  • Compositional tuning in dispersion and film forms.

Main Results:

  • Achieved a record electrical conductivity of 35,000 S cm⁻¹.
  • Demonstrated exceptional broadband EMI shielding across X, Kₐ, and W bands.
  • Outperformed existing materials in EMI shielding, even at reduced thicknesses.
  • Attained complete composition tunability in TiₓC<0xE1><0xB5><0xA7>Nₓ<0xE2><0x82><0x93>y<0xE2><0x82><0x93>₁T<0xE1><0xB5><0xA3> MXenes.

Conclusions:

  • TiₓC<0xE1><0xB5><0xA7>Nₓ<0xE2><0x82><0x93>y<0xE2><0x82><0x93>₁T<0xE1><0xB5><0xA3> MXenes with optimized nitrogen content exhibit superior electrical and EMI shielding performance.
  • These materials are highly promising for next-generation sub-terahertz electronics and conventional applications.
  • The findings pave the way for advanced EMI shielding solutions.